WO2017107193A1

WO2017107193A1 - Low dropout regulator and voltage regulation method

Info

Publication number: WO2017107193A1
Application number: PCT/CN2015/098943
Authority: WO
Inventors: 唐样洋; 王新入; 张臣雄
Original assignee: 华为技术有限公司
Priority date: 2015-12-25
Filing date: 2015-12-25
Publication date: 2017-06-29
Also published as: CN108292893A; CN108292893B

Abstract

A low dropout regulator and a voltage regulation method. The low dropout regulator comprises a first switch array module (100), a signal control module (200), a power switch module (300), a voltage feedback module (400), and a switch control module (500); the first switch array module (100) comprises multiple passages connected in parallel and used for inputting a first voltage (V1) and outputting a second voltage (V2); the signal control module (200) is used for periodically regulating conduction time and conduction state of the multiple passages connected in parallel, in order to periodically regulate the second voltage (V2); the power switch module (300) is used for inputting the second voltage (V2) and outputting a third voltage (Vo); the voltage feedback module (400) is used for generating a feedback voltage (Vreg) according to the third voltage (Vo); the switch control module (500) is used for controlling the conduction state of the power switch module (300) according to the comparison result between the feedback voltage (Vreg) and a reference voltage (Vref), in order to regulate the magnitude of the third voltage (Vo) and maintain the third voltage (Vo) within a preset value range, thereby improving the frequency response characteristic of the low dropout regulator and improving its performance by means of a non-algorithmic approach.

Description

Low dropout regulator and voltage regulation method

Technical field

The present invention relates to the field of circuit technologies, and in particular, to a voltage difference voltage regulator and a voltage regulation method.

Background technique

As shown in FIG. 1, the low-dropout voltage regulator in the prior art includes: a power switch 001, a feedback voltage structure 002, and a switch controller 003, wherein the power switch 001 input terminal is connected to the input voltage Vdd, and the output terminal Vo Connected to the load 004, the working voltage is supplied to the load 004, and one end of the feedback voltage structure 002 is connected to the output end of the power switch 001 for detecting the output voltage Vo of the power switch 001, and generating a feedback voltage Vreg according to the output voltage to the switch. The controller 003, the first input end of the switch controller 003 is connected to the reference voltage Vref, the second input end is connected to the feedback voltage structure 002, the output end is connected to the power switch 001, and the reference voltage Vref and the first input are input according to the first input end thereof. The feedback voltage Vreg at the two inputs controls the conduction and deactivation of the power switch 001.

In the prior art, the improvement of the control algorithm in the switch controller is mainly improved when the performance of the low-dropout regulator is improved. Therefore, how to improve the performance of the low-dropout regulator by non-algorithm is an urgent problem to be solved by those skilled in the art. .

Summary of the invention

In order to solve the above technical problem, an embodiment of the present invention provides a low dropout voltage regulator, which improves the performance of the low dropout regulator by structural improvement, thereby achieving non-algorithm Ways to improve the performance of low dropout regulators.

To solve the above problem, the embodiment of the present invention provides the following technical solutions:

In a first aspect, the present invention provides a low dropout voltage regulator comprising: a first switch array module, a signal control module, a power switch module, a voltage feedback module, and a switch control module, wherein

The first switch array module includes a plurality of parallel paths, and an input end of the first switch array module inputs a first voltage, and an output end outputs a second voltage;

The output end of the signal control module is connected to the control end of the switch array module for periodically adjusting the on-time and the on-state of the plurality of parallel paths to periodically adjust the second voltage size;

The input end of the power switch module is connected to an output end of the first switch array module, and is configured to input the second voltage and output a third voltage;

An input end of the voltage feedback module is connected to an output end of the power switch module, configured to detect the third voltage, and generate a feedback voltage according to the third voltage to output;

The first input end of the switch control module is connected to the output end of the voltage feedback module for inputting the feedback voltage, the second input end is provided with a reference voltage, and the output end is connected to the control end of the power switch module And controlling a conduction state of the power switch module according to a comparison result of the feedback voltage and the reference voltage, so as to adjust a size of the third voltage, so that the third voltage is maintained in a preset value range. In order to improve the frequency response characteristic of the low dropout regulator, thereby improving the transient response and linear response of the low dropout regulator, improving the accuracy of the output voltage of the low dropout regulator, and improving The performance of the low dropout regulator.

In conjunction with the first aspect, in a first possible implementation manner of the present disclosure, the first switch array module includes:

a plurality of first control switch groups, the plurality of first control switch groups being connected in parallel, the plurality of first controls The switch group is in one-to-one correspondence with the plurality of parallel paths, wherein each of the plurality of first control switch groups includes at least one control switch.

In conjunction with the first aspect, in a second possible implementation of the present invention, the power switch module includes a single switch; the switch control module includes: a single comparator.

With reference to the first aspect, in a third possible implementation manner of the present invention, the power switch module includes: a plurality of switches in parallel; the switch control module includes a plurality of parallel comparators, the plurality of parallel The comparator is in one-to-one correspondence with the plurality of switches in parallel.

In conjunction with the third possible implementation of the first aspect, in a fourth possible implementation manner of the present invention, the switch control module further includes: the plurality of parallel comparators in parallel with the plurality of A controller between the switches for selectively controlling the conduction and the turn-off of the path between the comparator and its corresponding switch by a control signal output by the plurality of comparators.

In conjunction with the first aspect or any of the foregoing possible implementation manners, in a fifth possible implementation manner of the present invention, a coupling capacitor connected in parallel with the external load is disposed between the output end of the power switch module and the ground.

In conjunction with the fifth possible implementation of the first aspect, in a sixth possible implementation manner of the present disclosure, the signal control module includes:

a signal unit for generating a periodic pulse signal;

a control unit, configured to receive the periodic pulse signal, and generate a plurality of control signals according to the periodic pulse signal, wherein the plurality of control signals are in one-to-one correspondence with the plurality of parallel paths for controlling the An on-time and an on-state of the plurality of paralleled paths, and a phase difference between the plurality of control signals, the phase difference being greater than zero.

In conjunction with the sixth possible implementation of the first aspect, in a seventh possible implementation of the present invention, the signal unit is an oscillator.

In conjunction with the sixth possible implementation of the first aspect, in an eighth possible implementation manner of the present invention, the control unit outputs N control signals, and a phase difference between adjacent control signals is 360°. /N, where N is a positive integer greater than one.

In conjunction with the fifth possible implementation of the first aspect, in a ninth possible implementation manner of the present invention, the method further includes:

a second switch array module, the second switch array module is located between a side of the coupling capacitor facing away from the power switch module and the ground, and the second switch array module includes: a plurality of second control switch groups, a plurality of second control switch groups are connected in parallel, and the plurality of second control switch groups are in one-to-one correspondence with the plurality of first control switch groups, and are configured to control the coupling capacitor to face away from the side of the power switch module and the ground a conducting state and an on-time of each of the plurality of paths, wherein each of the plurality of second control switch groups includes at least one control switch;

The signal control module is further connected to the second switch array module for controlling an on state and an on time of the plurality of second control switch groups.

With reference to the ninth possible implementation manner of the first aspect, in a tenth possible implementation manner of the present invention, each control switch in the first switch array module is a P-type metal-oxide field effect transistor, Each of the control switches in the second switch array module is an N-type metal-oxide field effect transistor; or, each of the control switches in the first switch array module is an N-type metal-oxide field effect transistor, and the second switch array Each control switch in the module is a P-type metal-oxide field effect transistor;

An inverter is further disposed between the second switch array module and the signal control module.

With reference to the ninth possible implementation manner of the first aspect, in the eleventh possible implementation manner of the present invention, each control switch in the first switch array module is a P-type metal-oxide field effect transistor, Each control switch in the second switch array module is a P-type metal-oxide field effect transistor; or each control switch in the first switch array module is an N-type metal-oxide field effect transistor, and the second switch Each control switch in the array module is an N-type metal-oxide field effect transistor.

In conjunction with the ninth possible implementation of the first aspect, in a twelfth possible implementation manner of the present invention,

The signal control module includes:

a signal unit for generating a periodic pulse signal;

a control unit, configured to receive the periodic pulse signal, and generate a plurality of control signals according to the periodic pulse signal, where the control signal is in one-to-one correspondence with the first control switch group and the second control switch group And controlling an on state and an on time of the first control switch group and the second control switch group, and a phase difference between the plurality of control signals, the phase difference being greater than zero.

In conjunction with the twelfth possible implementation of the first aspect, in a thirteenth possible implementation of the present invention, the signal unit is a clock signal unit.

With reference to the thirteenth possible implementation manner of the first aspect, in the fourteenth possible implementation manner of the present invention, the first switch array module includes M parallel first control switch groups, and the second switch The array module includes M parallel control switch groups, wherein a phase difference between adjacent first control switch groups in the first switch array module is 360°/M, and adjacent ones of the second switch array modules The phase difference between the two control switch groups is 360°/M, where M is a positive integer greater than one.

In a second aspect, the present invention provides a voltage regulation method for a low dropout regulator, the adjustment method comprising:

Generating, according to the first voltage, a second voltage under the control of the first control signal, such that the second voltage changes periodically;

And generating, according to the second voltage, a third voltage under the control of the second control signal, so that the third voltage is maintained within a preset value range;

The first control signal is a periodic change signal, and the second control signal is generated according to a comparison result of the third voltage and a preset voltage.

With reference to the second aspect, in a first possible implementation manner of the present invention, the third voltage is generated under the control of the second control signal according to the second voltage, so that the third voltage is maintained at a pre The range of values includes:

When the third voltage is greater than the preset voltage, according to the second voltage, under the control of the second control signal, lowering the voltage value of the third voltage, so that the third voltage is maintained at a preset Number Within the value range;

When the third voltage is less than the preset voltage, increasing a voltage value of the third voltage under the control of the second control signal according to the second voltage, so that the third voltage is maintained at a pre-charge Set the value range.

Compared with the prior art, the above technical solution has the following advantages:

The low dropout voltage regulator provided by the embodiment of the invention includes: a first switch array module, a signal control module, a power switch module, a voltage feedback module and a switch control module, wherein the first switch array module comprises a plurality of parallel a path for inputting a first voltage, outputting a second voltage, the signal control module being connected to the switch array module, for periodically adjusting an on-time and a conduction state of the plurality of parallel paths, Periodically adjusting a magnitude of the second voltage, the power switch module is configured to input the second voltage, output a third voltage, and the voltage feedback module is configured to generate a feedback voltage according to the third voltage, the switch The control module is configured to control an on state of the power switch module according to a comparison result between the feedback voltage and the reference voltage, to adjust a size of the third voltage, so that the third voltage is maintained at a preset value Within the scope.

It can be seen that, in the low-dropout voltage regulator provided by the embodiment of the present invention, not only the switch control module can control the conduction state of the power switch module, but also adjust the size of the third voltage, and The signal control module adjusts a magnitude of the third voltage by controlling an on-time and a conduction state of each parallel path in the first switch array module, and the power switch module is subjected to the voltage feedback module and the switch Controlling the control module, the first switch array module is not controlled by the voltage feedback module and the switch control module, so that the control signals of the first switch array module and the power switch module do not completely overlap, ie The first switch array module and the power switch module are equivalent to two control systems with different cutoff frequencies and different center frequencies, thereby improving the frequency response characteristics of the low dropout regulator, thereby improving the low dropout voltage The transient response and linear response of the regulator increase the accuracy of the output voltage of the low dropout regulator and increase the low voltage The performance of the regulator.

It can be seen from the above that the low-dropout voltage regulator provided by the embodiment of the present invention achieves the purpose of improving the performance of the low-dropout regulator by improving the circuit structure of the low-dropout regulator, instead of The improvement of the control algorithm in the switch control module achieves the purpose of the performance of the low dropout regulator, thereby realizing the purpose of improving the performance of the low dropout regulator by a non-algorithmic method.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic diagram showing the circuit structure of a low-dropout regulator in the prior art;

2 is a schematic structural diagram of a low dropout voltage regulator according to an embodiment of the present invention;

3 is a schematic structural view of a low dropout voltage regulator according to an embodiment of the present invention;

4 is a schematic structural view of a low dropout voltage regulator according to another embodiment of the present invention;

The amplitude-frequency response curve of the low-dropout regulator of the prior art and the low-dropout regulator of one embodiment of the present invention is shown in FIG. 5;

6 shows a phase-frequency response curve of a low-dropout regulator in the prior art and a low-dropout regulator in one embodiment of the present invention;

7 is a partial schematic structural view of a low dropout voltage regulator according to another embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a signal control module in a low dropout voltage regulator according to an embodiment of the present invention; FIG.

9 is a schematic diagram of an equivalent circuit for charging a coupling capacitor during operation of the low dropout regulator shown in FIG. 8;

10 is a schematic diagram showing an equivalent circuit of a coupling capacitor discharge during the operation of the low-dropout regulator shown in FIG. 8;

11 is a schematic structural view of a low dropout voltage regulator according to still another embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a low dropout voltage regulator according to still another embodiment of the present invention.

detailed description

The embodiment of the invention provides a low dropout voltage regulator, comprising: a first switch array module, a signal control module, a power switch module, a voltage feedback module and a switch control module, wherein

The first input end of the switch control module is connected to the output end of the voltage feedback module for inputting the feedback voltage, the second input end is provided with a reference voltage, and the output end is connected to the control end of the power switch module And controlling, according to a comparison result of the feedback voltage and the reference voltage, an on state of the power switch module to adjust a size of the third voltage, so that the third voltage dimension Hold in the preset value range.

In the low-dropout voltage regulator provided by the embodiment of the present invention, not only the switch control module can control the conduction state of the power switch module, but also the size of the third voltage, and can also be controlled by the signal. The module adjusts a size of the third voltage by controlling an on-time and a conduction state of each parallel path in the first switch array module, and the power switch module is subjected to the voltage feedback module and the switch Controlling the control module, the first switch array module is not controlled by the voltage feedback module and the switch control module, so that the control signals of the first switch array module and the power switch module do not completely overlap, ie The first switch array module and the power switch module are equivalent to two control systems with different cutoff frequencies and different center frequencies, thereby improving the frequency response characteristics of the low dropout regulator, thereby improving the low dropout voltage The transient response and linear response of the regulator increase the accuracy of the output voltage of the low dropout regulator and increase the low dropout Performance of pressure.

It can be seen from the above that the low-dropout voltage regulator provided by the embodiment of the present invention achieves the purpose of improving the performance of the low-dropout regulator by improving the circuit structure of the low-dropout regulator, instead of The improvement of the control algorithm in the switch control module achieves the purpose of the performance of the low dropout regulator, thereby achieving the purpose of improving the performance of the low dropout regulator by a non-algorithmic method.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

As shown in FIG. 2, an embodiment of the present invention provides a low dropout voltage regulator, including: a first switch array module 100, a signal control module 200, a power switch module 300, a voltage feedback module 400, and a switch control module 500. The first switch array module 100 includes a plurality of parallel paths, and the input end of the first switch array module 100 inputs a first voltage V1, and the output end outputs a second voltage V2, wherein the first voltage is an external Supply voltage Vdd;

The output end of the signal control module 200 is connected to the control end of the first switch array module 100 for periodically adjusting the on-time and the on-state of the plurality of parallel paths in the first switch array module 100. , thereby periodically adjusting the magnitude of the second voltage V2;

The input end of the power switch module 300 is connected to the output end of the first switch array module 100, and the output end is connected to the load 600 for inputting the second voltage V2, and outputting the third voltage V0 to the load 600 to provide the load 600. Drive signal

The input end of the voltage feedback module 400 is connected to the output end of the power switch module 300 for detecting the third voltage Vo, and generating a feedback voltage Vreg according to the third voltage V0 for output;

The first input end of the switch control module 500 is connected to the output end of the voltage feedback module 400 for inputting the feedback voltage Vreg, the second input end is provided with a reference voltage Vref, and the output end and the power switch module 300 The control terminal is connected to control the conduction state of the power switch module 300 according to the comparison result of the feedback voltage Vreg and the reference voltage Vref, so as to adjust the size of the third voltage V0, so that the first The three voltages V0 are maintained within a preset value range.

Based on the above embodiment, in one embodiment of the present invention, one end of the load 600 is connected to the output end of the power switch module 300, and the other end is connected to the ground.

In the embodiment of the present invention, the signal control module 200 is configured to control an on-time and a conduction state of each parallel path in the first switch array module 100, so that each of the first switch array modules 100 is The on-time and the on-state of the connected path are not completely the same at different times, thereby implementing the The periodic adjustment of the magnitude of the two voltages V2 further realizes the adjustment of the output voltage of the power switch module 300.

In the embodiment of the present invention, the voltage feedback module 400 is configured to detect the third voltage Vo at the output end of the power switch module 300 and feed it back to the switch control module 500 in the form of a feedback voltage Vreg. It should be noted that the feedback voltage Vreg may be an actual voltage value or a signal indicating a magnitude of the voltage value, which is not limited by the present invention, as the case may be.

It should be noted that, in the embodiment of the present invention, the voltage feedback module 400 may be implemented by a voltage dividing resistor, or may be implemented by a voltage sensor component, or may be implemented by other methods of implementing voltage feedback, due to its specific implementation manner. It is well known to those skilled in the art, and the present invention will not be described in detail.

After receiving the feedback voltage Vreg, the switch control module 500 compares the feedback voltage Vreg with the reference voltage Vref of the second input terminal, and generates a control according to the comparison result of the feedback voltage Vreg and the reference voltage Vref. The signal controls the conduction state of the power switch module 300.

Specifically, in the embodiment of the present invention, in an embodiment of the present invention, as shown in FIG. 3 and FIG. 4, the first switch array module 100 includes: a plurality of first control switch groups, the plurality of The first control switch group is connected in parallel for receiving the first voltage V1 and outputting the second voltage V2, wherein the plurality of first control switch groups are in one-to-one correspondence with the plurality of parallel paths for The conduction state of the corresponding path is controlled under the control of the signal control module 200.

It should be noted that, in the foregoing embodiment, each of the plurality of first control switch groups includes at least one control switch. Specifically, in an embodiment of the embodiment, each of the plurality of first control switch groups includes one control switch; in another embodiment of the embodiment In an embodiment, at least one of the plurality of first control switch groups includes a plurality of control switches, and the plurality of control switches of the same first control switch group may be connected in series, may be connected in parallel, or may be partially In series, partial parallel, the invention is not limited thereto, as the case may be.

It should be noted that any one of the first control switch groups can operate in a saturation zone, can also work in a closed zone, and can also work in a linear zone, which is not limited by the present invention. Depending on the situation, the control switches in the first switch array module 100 can be turned on at the same time, or can be turned off at the same time, or partially turned on, partially closed, so that the signal control module 200 can control the first switch. In the first control switch group of the array module 100, the working state of the switch is controlled, and the on-time and the on-state of each of the first control switch groups are adjusted, thereby adjusting the size of the second voltage V2, and finally implementing the power. The switching module 300 regulates the output voltage.

Based on the above embodiments, in one embodiment of the present invention, as shown in FIG. 3, the power switch module 300 includes a single switch, and the switch control module 500 includes a single comparator. Preferably, the switch is a power switch. In this embodiment, when the feedback voltage Vreg received by the comparator is greater than the reference voltage Vref, the comparator outputs a control signal, and the switch is increased by controlling the switch to operate in different linear regions. The equivalent resistance reduces the third voltage Vo of the output of the power switch module 300; when the feedback voltage Vreg received by the comparator is less than the reference voltage Vref, the comparator outputs a control signal by controlling the The switch operates in different linear regions, reducing the equivalent resistance of the switch, and increasing the third voltage Vo at the output of the power switch module 300.

In another embodiment of the present invention, as shown in FIG. 4, the power switch module 300 includes a plurality of switches in parallel. Correspondingly, the switch control module 500 includes a plurality of comparators 501 connected in parallel. The parallel comparators 501 are in one-to-one correspondence with the plurality of parallel switches. Preferably, the plurality of MOSFET, metal-oxide semiconductor field effect transistor

On the basis of the foregoing embodiment, in one embodiment of the present invention, multiple switches in the power switch module 300 are simultaneously turned on and off at the same time. In this embodiment, multiple switches in the switch control module 500 are provided. The control process of the comparator 501 is similar to the control process of the corresponding switch of the single comparator, and the present invention will not be described in detail.

In another embodiment of the present invention, the switch control module 500 further includes: a controller 502 between the plurality of parallel comparators 501 and the plurality of parallel switches, the controller 502 The conduction and the off of the path between the comparator 501 and its corresponding switch are controlled by a control signal selectively outputted by the plurality of comparators 501. In this embodiment, when the comparator 501 receives the feedback voltage greater than the reference voltage, the controller 502 can increase by controlling the switches in the plurality of switches to operate in different linear regions. The equivalent resistance of the plurality of switches reduces the third voltage Vo of the output end of the power switch module 300, and can also control the power switch module 300 to be guided by selectively controlling the control signal output by the comparator 501. The number of switches in the on state increases the equivalent resistance of the power switch module 300, reduces the third voltage Vo at the output of the power switch module 300, and simultaneously controls the power switch module 300 to be in an on state. The number of switches and the switches in the plurality of switches operate in different linear regions to increase the equivalent resistance of the power switch module 300, and reduce the third voltage Vo at the output end of the power switch module 300. The invention is not limited thereto, as the case may be.

Similarly, when the comparator 501 receives the feedback voltage Vreg less than the reference voltage Vref, the controller 502 can reduce the operation by controlling the switches in the plurality of switches to operate in different linear regions. The equivalent resistance of the power switch module 300 is increased, and the third voltage Vo of the output end of the power switch module 300 is increased, and the control signal output by the comparator 501 can also be selectively controlled. And controlling the number of switches in the power switch module 300 in an on state to reduce the equivalent resistance of the power switch module 300, and increasing the third voltage Vo at the output end of the power switch module 300, Controlling the number of switches in the power-on module 300 in an on state and the switches in the plurality of switches operating in different linear regions to reduce the equivalent resistance of the power switch module 300 and increase The third voltage Vo of the output end of the power switch module is not limited by the present invention, as the case may be.

It should be noted that, in any of the above embodiments, any one of the power switch modules 300 can operate in a saturation region, a closed region, or a linear region, which is not limited by the present invention, as the case may be. set.

It should be further noted that, in the above embodiment, the switch control module 500 controls the number of the conductive switches in the power switch module 300 to be related to the comparison result between the feedback voltage and the reference voltage at the input end, when the feedback voltage is The greater the difference between the reference voltages, the greater the number of switches in the power switch module 300 that are in an on state, and vice versa, the smaller the difference between the feedback voltage and the reference voltage, The fewer the number of switches in the power switch module 300 that are in the on state, the present invention is not limited thereto, as the case may be.

It should be noted that, in the embodiment of the present invention, the controller 502 is a gate device, and may also be a gate circuit composed of an OR gate in a logic gate. The invention is not limited thereto, and is determined by the circumstances.

On the basis of any of the above embodiments, referring to FIG. 4, in an embodiment of the present invention, the signal control module 200 includes:

a signal unit 201, configured to generate a periodic pulse signal;

The control unit 202 is configured to receive the periodic pulse signal, and according to the periodic pulse signal And generating a plurality of control signals, wherein the plurality of control signals are in one-to-one correspondence with the plurality of parallel paths, and are configured to control an on-time and a conduction state of each parallel path in the first switch array module 100, Thereby adjusting the magnitude of the second voltage V2, wherein there is a phase difference between the plurality of control signals, and the phase difference is greater than zero.

On the basis of the above embodiments, in one embodiment of the present invention, the first switch array module 100 includes N parallel paths, that is, the first switch array module 100 includes N parallel first switch controls. And correspondingly, the control unit 202 outputs N control signals, each control signal corresponding to a first switch control group. In this embodiment, the N control signals are related in phase, and also In phase, the phase difference between adjacent control signals is 360°/N, that is, the phase difference between the control signals of adjacent first control switch groups is 360°/N, where N is a positive integer greater than one.

Specifically, in an embodiment of the present invention, the first switch array module 100 includes four first switch control groups connected in parallel, and the four control signals output by the signal control module 200 are adjacent between adjacent control signals. The phase difference is 360°/4=90°, that is, the phase difference between the control signals of adjacent first control switch groups is 360°/4=90°. In another embodiment of the present invention, the first switch array module 100 includes eight parallel switch control groups, eight control signals output by the signal control module 200, and phases between adjacent control signals. The difference is 360°/8=45°, that is, the phase difference between the control signals of the adjacent first control switch groups is 360°/8=45°.

Based on the above embodiment, in one embodiment of the invention, the signal unit 201 is an oscillator for generating a periodic pulse signal. It should be noted that, in the embodiment of the present invention, the periodic pulse signal generated by the oscillator may be a sawtooth pulse signal, or may be a rectangular pulse signal or other periodic pulse signals, which is not limited by the present invention. , depending on the situation. still need It is noted that during the operation of the low-dropout stabilizer, the frequency of the periodic pulse signal generated by the oscillator may be fixed or may be changed in real time. Similarly, the amplitude may also be fixed. The present invention does not limit this, as the case may be.

Specifically, in an optional embodiment of the present invention, the periodic pulse signal has a duty ratio of 1:1 and a frequency of 10 Mhz, but the invention is not limited thereto, as the case may be.

Based on any of the above embodiments, the control unit 202 includes a plurality of parallel delay units for receiving the periodic pulse signals and converting them into multi-phase periodicity. The pulse signal is output to the plurality of first control switch groups, wherein each delay unit corresponds to a phase periodic pulse signal, and correspondingly, corresponding to a first control switch group, for receiving periodic pulses thereof The signal is output to its corresponding first control switch group, and the on-time of the corresponding first control switch group is controlled by controlling the output time of its corresponding periodic pulse signal.

In an optional embodiment of the present invention, in the optional embodiment of the present invention, the delay unit is implemented by an even number of inverters in series, and the number of inverters included in the delay unit is determined by its corresponding specific The present invention is not limited thereto depending on the delay time. For example, when the first switch array module 100 includes four parallel control switch groups, the periodic pulse signal has a frequency of 10 Mhz, and the phase difference of the adjacent phase periodic pulses is 360°/4=90. °, the time difference is 25 ns, that is, the signal output by the second delay unit is 90° larger than the phase of the output signal of the first delay unit, and the time delay is 25 ns.

It should be noted that, in the embodiment of the present invention, in each embodiment of the present invention, each control switch in the first switch array module 100 is preferably a MOSFET of the same parameter under the same process library (ie, metal). Oxide semiconductor field effect transistor). The metal-oxide semiconductor field effect transistor may be a P-type metal-oxide semiconductor field effect transistor or an N-type metal-oxide semiconductor field effect transistor, which is not limited by the present invention. Depending on the situation.

In a preferred embodiment of the present invention, the low dropout voltage regulator further includes an output end of the signal control module 200 and a control end of the first switch array module 100. a driver (not shown) to increase the control signal output by the signal control module 200, improve the driving capability of the signal control module 200, and ensure that the control signal output by the signal control module 200 can control the Each of the first control switch groups in the first switch array 100 can operate in any of the saturation region, the cutoff region, and the linear region, but the invention is not limited thereto, as the case may be.

It can be seen that the low voltage difference regulator provided by the embodiment of the present invention can detect the third voltage of the output end of the power switch module 300 through the voltage feedback module 400 and feed back to the switch control module 500, and then use the The switch control module 500 controls the working state of the power switch module 300 according to the comparison result of the feedback voltage and the reference voltage, and implements adjustment of the output voltage of the power switch module 300, so that the output voltage of the power switch module 300 remains stable or Maintain a certain range of fluctuations. In addition, the low-dropout regulator provided by the embodiment of the present invention can further control the on-time and the on-state of the plurality of parallel paths in the first switch array module 100 by using the signal control module 200, and adjust The output of the first switch array module 100 is provided to a second voltage of the input end of the power switch module 300, thereby implementing adjustment of the output voltage of the power switch module 300.

The power switch module 300 is controlled by the voltage feedback module 400 and the switch control module 500, and the first switch array module 100 is controlled by the signal control module 200 without being subjected to the voltage feedback module. And control of the switch control module 500 such that control signals of the first switch array module 100 and the power switch module 300 do not completely overlap, that is, the first switch array module 100 and the power switch module 300 is equivalent to two control systems with different cutoff frequencies and different center frequencies, thereby improving the frequency response characteristics of the low dropout regulator, thereby improving the transient response and linear response of the low dropout regulator, and improving The low dropout regulator is lost The accuracy of the output voltage improves the performance of the low dropout regulator.

As shown in FIG. 5 and FIG. 6, FIG. 5 shows the amplitude-frequency response curves of the low-dropout regulator in the prior art and the low-dropout regulator in the embodiment of the present invention; FIG. 6 shows the existing The phase-frequency response curve of the low-dropout regulator in the technology and the low-dropout regulator in the embodiment of the present invention. Wherein, the curve a is the amplitude-frequency response curve and the phase-frequency response curve of the low-dropout regulator in the prior art; the curve b is the amplitude-frequency response curve and the phase-frequency response curve of the low-dropout regulator in the embodiment of the present invention; . As can be seen from FIG. 5 and FIG. 6, the low dropout voltage regulator provided by the embodiment of the present invention improves the frequency response characteristic of the low dropout regulator, and improves the power supply system including the low dropout regulator in a specific High gain characteristics in range, as well as bandwidth.

On the basis of any of the above embodiments, in one embodiment of the present invention, a coupling capacitor C connected in parallel with the load 600 is further disposed between the power switch module 300 and the ground Gnd, and the coupling capacitor C may be It functions to filter the AC portion of the output current of the power switch module 300. On the other hand, the coupling capacitor C can also provide a driving signal to the load 600 during the gradually turning off of each path in the first switch array module 100, thereby reducing the supply voltage Vdd to the The power supply to load 600, which in turn reduces the peak power consumption of the power system that provides the supply voltage to the load 600. The peak power consumption of the power supply system in which the coupling capacitor C can reduce the supply voltage to the load 600 will be specifically described below.

In a specific embodiment of the present invention, during the operation of the low-dropout regulator, the minimum value of the second voltage is a first value, and the maximum value is a second value, that is, the second voltage V2 is from the first During a change from a value to a second value, the second voltage V2 is gradually increased, and during the process of changing the second voltage V2 from the second value to the first value, the second voltage V2 is gradually decreased. .

In the above embodiment, when the power switch module 300 is in an on state, the second voltage V2 gradually increases during the process of changing the second voltage V2 from the first value to the second value. Description The second voltage V2 provides a driving signal to the load 600 through the power switch module 300 on the one hand, and simultaneously charges the coupling capacitor C through the power switch module 300 until the coupling capacitor C reaches saturation or The second voltage V2 reaches a second value; when the second voltage V2 changes from the second value to the first value, the second voltage V2 gradually decreases, and correspondingly, the output of the power switch module 300 The third voltage may decrease. When the third voltage at the output end of the power switch module 300 is less than the voltage of the positive terminal of the coupling capacitor C, the coupling capacitor C is discharged to compensate the driving signal of the load 600, and The signals outputted by the output of the power switch module 300 are collectively used as a drive signal of the load 600, thereby extending the load 600 in a case where the peak power consumption of the power supply system that supplies the load voltage to the load 600 is constant. The time of normal operation, that is, in the case where the power consumption of the load 600 and the normal operating time are constant, the peak value of the power supply system that supplies the supply voltage to the load 600 is lowered. Consumption.

Based on the above embodiment, in an embodiment of the present invention, as shown in FIG. 7, the low dropout voltage regulator further includes:

a second switch array module 700, the second switch array module 700 is located between the load 600 and a common end of the coupling capacitor C away from the power switch module 300 and the ground Gnd, the second switch array The module 700 includes: a plurality of second control switch groups, the plurality of second control switch groups are connected in parallel, and the plurality of second control switch groups are in one-to-one correspondence with the plurality of first control switch groups, and are used for controlling the The conduction state and the on-time of the respective paths between the load 600 and the coupling capacitor C away from the common end of the power switch module 300 and the ground Gnd, wherein each of the plurality of second control switch groups The second control switch group includes at least one control switch.

Specifically, in the embodiment of the present invention, in an embodiment of the present invention, each of the plurality of second control switch groups includes a control switch, and another embodiment of the present invention In an embodiment, at least one of the plurality of second control switch groups includes a plurality of control switches, and the plurality of control switches of the same second control switch group may be connected in series, may be connected in parallel, or may be partially In series, partial parallel, the invention is not limited thereto, as the case may be.

It should be noted that any one of the control switches of the second control switch group can work in a saturation zone, can also work in a closed zone, and can also work in a linear zone. The present invention does not limit this, as the case may be. And set.

In this embodiment, the signal control module 200 is further connected to the second switch array module 700 for controlling the on state and the on time of the plurality of second control switch groups. Specifically, in an embodiment of the present invention, as shown in FIG. 8, the signal control module includes:

a signal unit 201, configured to generate a periodic pulse signal;

The control unit 202 is configured to receive the periodic pulse signal, and generate a plurality of control signals according to the periodic pulse signal, the plurality of control signals being combined with the first control switch group and the second control switch group Correspondingly, the control signal is used to simultaneously control the on-time and the on-state of the first control switch group and the second control switch group.

Based on the foregoing embodiment, in an optional embodiment of the present invention, the first switch array module 100 includes M parallel first control switch groups, and the second switch array module 700 includes M parallel connections. The second control switch group, the first control switch groups in the first switch array module 100 are related in phase, and the phase difference between the control signals of the adjacent first control switch groups is 360°/M The second control switch group in the second switch array module 700 is also related in phase, and the phase difference between the control signals of the adjacent second control switch group is 360°/M, wherein M is greater than 1 Positive integer.

Specifically, in an embodiment of the present invention, the first switch array module 100 includes 4 a first control switch group connected in parallel, the second switch array module 700 includes four parallel control switch groups, the signal unit 201 outputs four control signals, and the phase difference between adjacent control signals is 360. ° / 4 = 90 °, that is, the phase difference between the control signals of the adjacent first control switch group is 360 ° / 4 = 90 °, the phase difference between the control signals of the adjacent second control switch group is 360 ° /4=90°; In another embodiment of the present invention, the first switch array module 100 includes eight parallel switch control groups, and the second switch array module 700 includes eight parallel second The switch control group, the eight control signals output by the signal control module 200, the phase difference between the adjacent control signals is 360°/8=45°, and the phase difference between the control signals of the adjacent first control switch groups For 360°/8=45°, the phase difference between the control signals of adjacent second control switch groups is 360°/8=45°.

On the basis of the above embodiments, in one embodiment of the present invention, each of the control switches in the first switch array module 100 is a P-type metal-oxide field effect transistor, and each of the second switch array modules 700 The control switch is an N-type metal-oxide field effect transistor; in another embodiment of the invention, each of the control switches in the first switch array module 100 is an N-type metal-oxide field effect transistor, the second Each of the control switches in the switch array module 700 is a P-type metal-oxide field effect transistor, which is not limited by the present invention, as the case may be.

It should be noted that when each control switch in the first switch array module 100 is a P-type metal-oxide field effect transistor, each control switch in the second switch array module 700 is an N-type metal-oxide field effect. In the case of a transistor, or each of the control switches in the first switch array module 100 is an N-type metal-oxide field effect transistor, and each of the control switches in the second switch array module 700 is a P-type metal-oxide field effect transistor. An inverter is further disposed between the second switch array module 700 and the signal control module 200, or an inverter is further disposed between the first switch array module 100 and the signal control module 200. To ensure that under the control signal of the signal control module 200, The first switch group and the second control switch group of the first switch array module 100 and the second switch array module 700 are simultaneously turned on or off at the same time.

In the following, each control switch in the first switch array module 100 is a P-type metal-oxide field effect transistor, and each control switch in the second switch array module 700 is an N-type metal-oxide field effect transistor, and The low-dropout voltage regulator provided by the embodiment of the present invention will be described by taking an inverter between the second switch array module 700 and the signal control module 200 as an example.

Since the P-type metal-oxide field effect transistor is turned off when its control signal is high level, its control signal is turned on when it is low level; for the N-type metal-oxide field effect transistor, its control signal is Turns on when the level is high, and turns off when the control signal is low. Therefore, in the present embodiment, when the control signal provided by the signal control module 200 is at a high level Vdd, each control switch in the first switch array module 100 is turned off, and each control switch in the second switch array is also When the control signal provided by the signal control module 200 is a low level, each control switch in the first switch array module 100 is turned on, and each control switch in the second switch array module 700 is also turned on. When the control signal provided by the signal control module 200 is between the high level Vdd and the low level zero and close to the low level zero, each control switch in the first switch array module 100 is in the proximity guide In the on state, each of the control switches in the second switch array module 700 is also in a near-on state.

It should be noted that in practical applications, in order to achieve a better gain effect, the gate control voltage of the control switch needs to be adjusted correspondingly in terms of voltage value. For applications where negative voltage is not considered, for PMOS, the gate The voltage should be less than the high level Vdd voltage and greater than the low level zero V, more biased towards zero V (such as 0.05V), we call the near conduction state. For the NMOS, it is less than the high level Vdd voltage and is higher than the low level zero V, and more biased to the high level Vdd, such as the voltage value of (Vdd - 0.05V), which is called the near conduction state. In this embodiment, the second switch array module 700 is Each of the control switches is an NMOS, and an inverter is disposed between the second switch array module 700 and the signal control module 200. Therefore, in the embodiment, the first switch array module 100 and the second switch are provided. The near-on states of the control switches in the array module 700 are both between the high level Vdd and the low level zero and close to the low level zero, such as at 0V-0.05V, excluding 0V, including 0.05V.

In the above embodiment of the present invention, in a certain embodiment of the present invention, the minimum value of the second voltage V2 is a first value, and the maximum value is a second value. When the power switch module 300 is in an on state, When the control signal provided by the signal control module 200 is gradually lowered from the high level Vdd to the low level, the control switches in the first switch array module 100 and the second switch array module 700 are gradually turned on. The second voltage V2 is gradually increased from the first value to the second value. In the process, the second voltage V2 provides a driving signal to the load 600 through the power switch control module 500 while passing the power switch. The module 300 charges the coupling capacitor, as shown in FIG. 9, the potential of the Vx point increases, the closer to the Vdd potential, and the potential of the Vy point decreases, the closer to Gnd; when the coupling capacitor C reaches saturation or When the second voltage V2 reaches the second value, the coupling capacitor C stops charging; when the control signal provided by the signal control module 200 gradually rises from a low level to a high level Vdd, the first switch array module 100 and second switch array module 700 Each control switch is gradually turned off. When the output voltage of the output end of the power switch module 300 is less than the voltage of the positive terminal of the coupling capacitor C, the coupling capacitor C starts to discharge. As shown in FIG. 10, the potential of the Vx point decreases. The farther the Vdd potential is, the higher the potential at the Vy point is and the further away from the Gnd potential.

In other embodiments of the present invention, each of the control switches in the first switch array module 100 and the second switch array module 700 may also be P-type metal-oxide field effect transistors, or all of them. The invention is not limited to the N-type metal-oxide field effect transistor, as the case may be.

Based on any of the above embodiments, in one embodiment of the present invention, as shown in FIG. 11, the signal unit 201 is a clock signal unit, and the clock signal unit is configured to generate a periodic pulse signal. The control unit 202 includes a plurality of parallel delay units for receiving the periodic pulse signal and converting the multi-phase periodic pulse signal to the plurality of first Controlling the switch group and the plurality of second control switch groups, wherein each delay unit corresponds to a phase periodic pulse signal, and correspondingly, corresponding to a first control switch group and a second control switch group, Outputting the received periodic pulse signal to its corresponding first control switch group and second control switch group, and controlling the corresponding first control switch group and the second by controlling the output time of the corresponding periodic pulse signal Controls the on-time and off-time of the switch group.

In an optional embodiment of the present invention, in the optional embodiment of the present invention, the delay unit is implemented by an even number of inverters in series, and the number of inverters included in the delay unit is determined by its corresponding specific The present invention is not limited thereto depending on the delay time.

It should be noted that the periodic signal provided by the clock signal unit is divided into a positive half cycle and a negative half cycle. In one cycle, each first control switch group in the first switch array module 100 is sequentially turned on. The time occupied is only half a cycle. Therefore, in this embodiment, the time delay between the control signals corresponding to the adjacent first control switch group is T/2M, and the first switch array module 100 can be guaranteed. A control switch group has all the times of being turned on or all turned off, where T is the period of the control signal provided by the clock signal unit, and M is the number of the first control switch group in the first switch array module 100, corresponding The time delay between the control signals corresponding to the adjacent second control switch group is also T/2M. For example, in a specific embodiment of the present invention, the first switch array module 100 includes four first control switch groups, and the second switch array module 700 includes four second control switch groups, the clock signal. The periodic signal provided by the unit has a period of 2 μs, and the adjacent first control switch group The time delay between the corresponding control signals is 2 μs/(2*4)=0.25 μs, and the time delay between the control signals corresponding to the adjacent second control switch group is also 2 μs/(2*4)=0.25 μs.

As shown in FIG. 12, in a specific application embodiment of the present invention, the load 600 is a digital circuit 800 controlled by the clock signal unit, and the digital circuit 800 includes a combinational logic circuit 801 and a sequential logic circuit 802. Wherein, when the signal control module 200 controls the first switch array module 100 to be in an on or near conduction state, the second voltage V2 is connected to an input end of the digital circuit 800 as the digital circuit. 800 provides a drive signal that enters an operational state. When the digital circuit 800 is in an active state, the combinational logic circuit 801 evaluates its input signal under the trigger of a rising edge in the periodic pulse signal provided by the clock signal unit in the signal control module 200. And outputting the result of the calculation to the sequential logic circuit 802, which is maintained under the trigger of the rising edge of the periodic pulse signal provided by the clock signal unit in the signal control module 200. The output result of the combinational logic circuit 801.

It should be noted that the timing logic circuit 802 and the control signal received by the combination logic circuit 801 have a certain time delay to ensure that the input signal input by the combination logic circuit 801 is evaluated and output. And outputting the output result of the combinational logic circuit 801 by using the sequential logic circuit 802. It should be noted that, in other embodiments of the present invention, the digital circuit 800 may also be a combination of the combination logic circuit 801 and the sequential logic circuit 802, which is not limited by the present invention, as the case may be. set.

In summary, the low-dropout voltage regulator provided by the embodiment of the present invention can not only provide the power switch module 300 to the home through the switch control module 500 by controlling the conduction state of the power switch module 300. The voltage of the load 600 can also be adjusted by the signal control module 200 by controlling the on-time and the on-state of each parallel path in the first switch array module 100. The power switch module 300 provides the voltage to the load 600, and the power switch module 300 is controlled by the voltage feedback module 400 and the switch control module 500, the first switch array module is not subject to the Control of the voltage feedback module 400 and the switch control module 500 such that the control signals of the first switch array module 100 and the power switch module 300 do not completely overlap, that is, the first switch array module 100 and the power The switch module 300 is equivalent to two systems with different cutoff frequencies and different center frequencies, thereby improving the frequency response characteristics of the low dropout regulator, thereby improving the transient response and linear response of the low dropout regulator. The accuracy of the output voltage of the low dropout regulator is increased, and the performance of the low dropout regulator is improved.

Moreover, the low dropout regulator provided by the embodiment of the present invention can also utilize the coupling capacitor C to drive the load 600 when the output voltage of the output end of the power switch module 300 is less than the voltage of the positive pole of the coupling capacitor. The signal is compensated such that the discharge current of the coupling capacitor C and the current outputted by the output of the power switch module 300 act together as the drive current of the load 600, thereby providing a peak value of the power supply system for supplying the supply voltage to the load 600. When the power consumption is constant, the time during which the load 600 works normally is extended, that is, when the power consumption of the load 600 and the normal working time are constant, the supply voltage for the load 600 is reduced. Peak power consumption of the power system.

In addition, the embodiment of the present invention further provides a voltage adjustment method, which is applied to the low dropout voltage regulator provided by any of the above embodiments, and the adjustment method includes:

Based on the above embodiment, in an embodiment of the present invention, the Pressing, under the control of the second control signal, generating a third voltage, such that maintaining the third voltage within a preset value range includes:

When the third voltage is greater than the preset voltage, according to the second voltage, under the control of the second control signal, lowering the voltage value of the third voltage, so that the third voltage is maintained at a preset Within the range of values;

It should be noted that, in the embodiment of the present invention, the first voltage is an external power supply voltage Vdd, and the third voltage is a voltage supplied to an external load, that is, an output voltage of the low dropout voltage regulator.

It can be seen that the voltage adjustment method provided by the embodiment of the present invention can not only adjust the third voltage by adjusting the second voltage by using a first control signal, but can directly adjust the third by the second control signal. a voltage, wherein the first control signal is a periodic change signal, and the second control signal is generated according to a comparison result of the third voltage and a preset voltage, that is, the first control signal and the second control The signals do not completely overlap, that is, the first control signal and the second control signal are equivalent to two systems with different cutoff frequencies and different center frequencies, thereby improving the frequency response characteristics of the low dropout regulator, thereby improving The transient response and linear response of the low dropout regulator increase the accuracy of the low dropout regulator output voltage and improve the performance of the low dropout regulator.

The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments may be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims

A low dropout voltage regulator, comprising: a first switch array module, a signal control module, a power switch module, a voltage feedback module, and a switch control module, wherein

The first switch array module includes a plurality of parallel paths, and an input end of the first switch array module inputs a first voltage, and an output end outputs a second voltage;

The output end of the signal control module is connected to the control end of the switch array module for periodically adjusting the on-time and the on-state of the plurality of parallel paths to periodically adjust the second voltage size;

The input end of the power switch module is connected to an output end of the first switch array module, and is configured to input the second voltage and output a third voltage;

An input end of the voltage feedback module is connected to an output end of the power switch module, configured to detect the third voltage, and generate a feedback voltage according to the third voltage to output;

The first input end of the switch control module is connected to the output end of the voltage feedback module for inputting the feedback voltage, the second input end is provided with a reference voltage, and the output end is connected to the control end of the power switch module And controlling a conduction state of the power switch module according to a comparison result of the feedback voltage and the reference voltage, so as to adjust a size of the third voltage, so that the third voltage is maintained in a preset value range. Inside.
The low dropout voltage regulator of claim 1 wherein said first switch array module comprises:

a plurality of first control switch groups, the plurality of first control switch groups being connected in parallel, the plurality of first control switch groups being in one-to-one correspondence with the plurality of parallel paths, wherein the plurality of first control switches Each of the first control switch groups in the group includes at least one control switch.
The low dropout regulator of claim 1 wherein said power switch module comprises a single switch; said switch control module comprising: a single comparator.
The low dropout regulator of claim 1 wherein said power switch module comprises: a plurality of switches in parallel; said switch control module comprising a plurality of comparators in parallel, said plurality of parallel comparisons The device is in one-to-one correspondence with the plurality of parallel switches.
The low dropout regulator of claim 4, wherein the switch control module further comprises: a controller between the plurality of parallel comparators and the plurality of parallel switches, The conduction and output of the path between the comparator and its corresponding switch are selectively controlled by the control signals output by the plurality of comparators.
The low-dropout voltage regulator according to any one of claims 1 to 5, characterized in that a coupling capacitor connected in parallel with the external load is arranged between the output end of the power switch module and the ground.
The low dropout regulator of claim 6 wherein said signal control module comprises:

a signal unit for generating a periodic pulse signal;

a control unit, configured to receive the periodic pulse signal, and generate a plurality of control signals according to the periodic pulse signal, wherein the plurality of control signals are in one-to-one correspondence with the plurality of parallel paths for controlling the An on-time and an on-state of the plurality of paralleled paths, and a phase difference between the plurality of control signals, the phase difference being greater than zero.
The low-dropout voltage regulator according to claim 7, wherein said control unit outputs N control signals, and a phase difference between adjacent control signals is 360°/N, wherein N is greater than 1 Integer.
The low dropout voltage regulator according to claim 6, further comprising:

a second switch array module, the second switch array module is located between a side of the coupling capacitor facing away from the power switch module and the ground, and the second switch array module includes: a plurality of second control switch groups, a plurality of second control switch groups are connected in parallel, and the plurality of second control switch groups are in one-to-one correspondence with the plurality of first control switch groups, and are configured to control the coupling capacitor to face away from the side of the power switch module and the ground a conduction state and an on-time of each of the plurality of paths, wherein each of the plurality of second control switch groups The switch group includes at least one control switch;

The signal control module is further connected to the second switch array module for controlling an on state and an on time of the plurality of second control switch groups.
The low-dropout voltage regulator according to claim 9, wherein each of the control switches in the first switch array module is a P-type metal-oxide field effect transistor, and each control switch in the second switch array module An N-type metal-oxide field effect transistor; or, each control switch in the first switch array module is an N-type metal-oxide field effect transistor, and each control switch in the second switch array module is a P-type metal - an oxide field effect transistor;

An inverter is further disposed between the second switch array module and the signal control module.
The low-dropout voltage regulator according to claim 9, wherein each of the control switches in the first switch array module is a P-type metal-oxide field effect transistor, and each control switch in the second switch array module a P-type metal-oxide field effect transistor; or, each control switch in the first switch array module is an N-type metal-oxide field effect transistor, and each control switch in the second switch array module is an N-type metal - Oxide field effect transistor.
The low dropout regulator of claim 9 wherein said signal control module comprises:

a signal unit for generating a periodic pulse signal;

a control unit, configured to receive the periodic pulse signal, and generate a plurality of control signals according to the periodic pulse signal, where the control signal is in one-to-one correspondence with the first control switch group and the second control switch group And controlling an on state and an on time of the first control switch group and the second control switch group, and a phase difference between the plurality of control signals, the phase difference being greater than zero.
A voltage regulation method is applied to a low dropout voltage regulator, characterized in that the adjustment method comprises:

Generating, according to the first voltage, a second voltage under the control of the first control signal, such that the second voltage changes periodically;

And generating, according to the second voltage, a third voltage under the control of the second control signal, so that the third voltage is maintained within a preset value range;

The first control signal is a periodic change signal, and the second control signal is generated according to a comparison result of the third voltage and a preset voltage.
The voltage adjustment method according to claim 13, wherein the third voltage is generated under the control of the second control signal according to the second voltage, so that the third voltage is maintained in a preset value range Includes:

When the third voltage is greater than the preset voltage, according to the second voltage, under the control of the second control signal, lowering the voltage value of the third voltage, so that the third voltage is maintained at a preset Within the range of values;

When the third voltage is less than the preset voltage, increasing a voltage value of the third voltage under the control of the second control signal according to the second voltage, so that the third voltage is maintained at a pre-charge Set the value range.