CN115079761A - Voltage regulating circuit, driving chip and electronic equipment - Google Patents

Voltage regulating circuit, driving chip and electronic equipment Download PDF

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Publication number
CN115079761A
CN115079761A CN202210769543.4A CN202210769543A CN115079761A CN 115079761 A CN115079761 A CN 115079761A CN 202210769543 A CN202210769543 A CN 202210769543A CN 115079761 A CN115079761 A CN 115079761A
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voltage
load circuit
current
low dropout
auxiliary unit
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CN115079761B (en
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郭建良
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Chipone Technology Beijing Co Ltd
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Chipone Technology Beijing Co Ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
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  • Automation & Control Theory (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

The present disclosure relates to a voltage regulating circuit, a driving chip and an electronic device, wherein the voltage regulating circuit comprises a low dropout regulator unit and an auxiliary unit, wherein the output end of the low dropout regulator unit is connected with the input end of a load circuit and the output end of the auxiliary unit, and is used for providing a first voltage and a first current for the load circuit when the load circuit is in a first working mode and a second working mode; the auxiliary unit is used for providing a second current for the load circuit when the load circuit is in a second working mode; and the current flowing in the load circuit in the second working mode is larger than the current flowing in the load circuit in the first working mode. According to the voltage regulating circuit disclosed by the embodiment of the disclosure, the transient response of the low dropout regulator can be optimized, and larger static power consumption current or larger power supply voltage is not required, so that the parameters of the low dropout regulator are more balanced.

Description

Voltage regulating circuit, driving chip and electronic equipment
Technical Field
The present disclosure relates to the field of integrated circuits, and in particular, to a voltage regulator circuit, a driver chip, and an electronic device.
Background
A Low-dropout Regulator (LDO) is a voltage source for providing a stable dc voltage. Important parameters include a drop voltage, a Supply voltage, a quiescent current, a maximum Output current, a Load Regulation (Load Regulation), a linear Regulation (Line Regulation), a Transient response (Transient response), a Power Supply Rejection Ratio (PSRR), an Output noise (Output noise), and the like. In order to optimize one parameter of the low dropout regulator, other parameters may need to be adversely affected, for example, when a better transient response is sought, a larger quiescent current or supply voltage is generally needed. This is detrimental to the equalization of the parameters of the low dropout regulator.
Disclosure of Invention
In view of this, the present disclosure provides a voltage regulating circuit, a driving chip and an electronic device, where the voltage regulating circuit according to the embodiments of the present disclosure can optimize a transient response of a low dropout regulator, and does not need to require a larger static power consumption current or a larger supply voltage, so that parameters of the low dropout regulator are more balanced.
According to an aspect of the present disclosure, a voltage regulating circuit is provided, which includes a low dropout regulator unit and an auxiliary unit, wherein an output terminal of the low dropout regulator unit is connected to an input terminal of a load circuit and an output terminal of the auxiliary unit, and is configured to provide a first voltage and a first current to the load circuit when the load circuit is in a first operating mode and a second operating mode; the auxiliary unit is used for providing a second current for the load circuit when the load circuit is in a second working mode; and the current flowing in the load circuit in the second working mode is larger than the current flowing in the load circuit in the first working mode.
In a possible implementation manner, the load circuit receives a control signal, the load circuit is in a first working mode when the control signal is at a first level, the load circuit is in a second working mode when the control signal is at a second level, the input end of the auxiliary unit is connected to a first power supply voltage, a first switch is included between the input end and the output end of the auxiliary unit, the first switch is further configured to receive the control signal, the first switch is turned off when the control signal is at the first level, and the first switch is turned on when the control signal is at the second level.
In one possible implementation, the auxiliary unit further includes a resistor, and the resistor and the first switch are connected in series between the input terminal and the output terminal of the auxiliary unit.
In a possible implementation, the auxiliary unit further comprises a current source connected in series with the first switch between the input and the output of the auxiliary unit.
In one possible implementation, the value of the second current is smaller than the value of the current flowing in the load circuit in the second operation mode.
In a possible implementation manner, the low dropout regulator unit includes an operational amplifier and a first transistor, a first input terminal of the operational amplifier is connected to a reference voltage, a second input terminal of the operational amplifier is connected to a second pole of the first transistor, and an output terminal of the operational amplifier is connected to a gate of the first transistor; a first electrode of the first transistor is used as an input end of the low dropout regulator unit and is connected with a second power supply voltage; and the second pole of the first transistor is used as the output end of the low dropout regulator unit.
In one possible implementation, the first supply voltage and the second supply voltage are the same.
In a possible implementation manner, the first supply voltage and the second supply voltage are different, and a value of the first supply voltage is smaller than a first threshold value.
According to another aspect of the present disclosure, there is provided a driving chip including at least one voltage regulating circuit as described above, the driving chip being configured to drive at least one load circuit.
According to another aspect of the present disclosure, there is provided an electronic device comprising at least one load circuit and at least one voltage regulating circuit as described above.
In one possible implementation, the electronic device comprises a display or a portable device.
According to the voltage regulating circuit disclosed by the embodiment of the disclosure, the low dropout regulator unit and the auxiliary unit are arranged, and the output end of the low dropout regulator unit is connected with the input end of the load circuit and the output end of the auxiliary unit, so that when the load circuit is in a first working mode, the low dropout regulator unit can provide a first voltage and a first current for the load circuit to serve as an output voltage and a load current; when the load circuit is in the second working mode, on the basis that the low dropout regulator unit provides the first voltage and the first current for the load circuit, the auxiliary unit can provide the second current for the load circuit, the first voltage is used as the output voltage, and the first current and the second current are used as the load current, so that the requirement that larger current flows in the load circuit in the second working mode can be met. The second current exists, so that the fluctuation of the first current is smaller when the working mode of the load circuit is switched, and the transient response of the low dropout regulator unit can be optimized; meanwhile, static power consumption current of the low dropout regulator unit does not need to be increased or higher power supply voltage does not need to be set for the low dropout regulator unit, and the low dropout regulator unit with more balanced parameters is realized.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic diagram illustrating a prior art low dropout regulator providing an output voltage to a load circuit.
Fig. 2 is a schematic diagram of another prior art low dropout regulator providing an output voltage to a load circuit.
Fig. 3 illustrates an exemplary block diagram of a voltage regulation circuit according to an embodiment of the present disclosure.
Fig. 4 shows an exemplary structural schematic diagram of the low dropout regulator unit 101 according to an embodiment of the present disclosure.
Fig. 5a shows a schematic diagram of an exemplary method for implementing output voltage regulation by the low dropout regulator unit 101 and the auxiliary unit 102 according to an embodiment of the present disclosure.
Fig. 5b illustrates an example of the current generated by the voltage regulation circuit during load circuit mode switching according to an embodiment of the present disclosure.
Fig. 6 illustrates an exemplary block diagram of the auxiliary unit 102 according to an embodiment of the present disclosure.
Fig. 7a illustrates an exemplary block diagram of the auxiliary unit 102 according to an embodiment of the disclosure.
Fig. 7b illustrates another exemplary block diagram of the auxiliary unit 102 according to an embodiment of the disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
In the description of the present disclosure, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and, therefore, should not be taken as limiting the present disclosure.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.
In the present disclosure, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integral with; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
The term "and/or" herein is merely an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B, C, and may mean including any one or more elements selected from the group consisting of A, B and C.
In some electronic devices, some devices need to be powered to work normally, and electric energy is converted into other energy, and the devices can be called loads. The circuit in which the load is located may be referred to as a load circuit. In order to make the load circuit operate stably, it is necessary to supply a stable voltage to the load circuit. Therefore, the prior art proposes a low dropout regulator with high output voltage stability to provide an output voltage for a load circuit.
Fig. 1 is a schematic diagram illustrating a prior art low dropout regulator providing an output voltage to a load circuit.
As shown in fig. 1, the low dropout regulator includes an operational amplifier and a P-Channel Metal Oxide Semiconductor (PMOS) transistor, wherein an inverting input terminal of the operational amplifier is connected to a reference voltage, and a non-inverting input terminal of the operational amplifier is connected to a drain of the PMOS transistor; the output end of the operational amplifier is connected with the grid electrode of the PMOS transistor, and the source electrode of the PMOS transistor is connected with the power supply voltage. The drain of the PMOS transistor also serves as the output terminal of the ldo regulator, and is connected to the input terminal of the load circuit to supply the load circuit with an output voltage and a load current (not shown).
The output voltage is inevitably changed in the moment of sudden change of the load current flowing through the load circuit, the low dropout regulator can feed back the change of the output voltage to the non-inverting input end of the operational amplifier included in the low dropout regulator, so that the voltage of the output end of the operational amplifier is also changed, the grid-source voltage of the PMOS transistor is further changed, the current flowing through the PMOS transistor is correspondingly changed, and the effect of stabilizing the output voltage can be realized. The maximum change in the output voltage caused when the load current flowing through the load circuit or the voltage fed back to the operational amplifier abruptly changes may be referred to as the transient response of the low dropout regulator.
Inside the LDO, except the drain-source current generated by the transistor, all the remaining devices consume and the current flowing through the feedback loop may be referred to as the quiescent current of the LDO. For the low dropout regulator, the transient response can be improved by increasing the response speed of the operational amplifier, but the static power consumption current must be increased, which increases the power consumption of the low dropout regulator.
Fig. 2 is a schematic diagram of another prior art low dropout regulator providing an output voltage to a load circuit.
As shown in fig. 2, the low dropout regulator includes an operational amplifier and an N-Channel Metal Oxide Semiconductor (NMOS) transistor, wherein a non-inverting input terminal of the operational amplifier is connected to a reference voltage, and an inverting input terminal of the operational amplifier is connected to a source of the NMOS transistor; the output end of the operational amplifier is connected with the grid electrode of the NMOS transistor, and the drain electrode of the NMOS transistor is connected with the power supply voltage. The source of the NMOS transistor also serves as the output terminal of the ldo, and is connected to the input terminal of the load circuit to supply the load circuit with an output voltage and a load current (not shown).
The way of adjusting the output voltage of the low dropout regulator after the load current flowing through the load circuit suddenly changes is similar to the adjusting way of fig. 1, and is not described herein again. Although the low dropout voltage regulator has good transient response, the power supply voltage is required to be larger than the sum of the output voltage and the gate-source voltage of the transistor, so that a higher power supply voltage is required, which also increases the power consumption of the low dropout voltage regulator.
In summary, in the prior art, when the low dropout regulator is used to supply power to the load circuit, in order to optimize transient response, or to increase static power consumption current, or to set a higher power supply voltage, the power consumption of the low dropout regulator is increased, so that the power consumption of the electronic device using the low dropout regulator is also increased, which is disadvantageous to the long endurance of the electronic device.
In view of this, the present disclosure provides a voltage regulating circuit, a driving chip and an electronic device, where the voltage regulating circuit according to the embodiments of the present disclosure can optimize a transient response of a low dropout regulator, and does not need to require a larger static power consumption current or a larger supply voltage, so that parameters of the low dropout regulator are more balanced.
Fig. 3 illustrates an exemplary block diagram of a voltage regulation circuit according to an embodiment of the present disclosure.
In one possible implementation, as shown in fig. 3, the voltage regulating circuit 10 comprises a low dropout regulator unit 101 and an auxiliary unit 102,
the output terminal a1 of the low dropout regulator unit 101 is connected to the input terminal c1 of the load circuit 20 and the output terminal b1 of the auxiliary unit 102, and is used for providing the load circuit 20 with a first voltage V1 and a first current I1 when the load circuit 20 is in the first operation mode and the second operation mode;
the auxiliary unit 102 is configured to provide a second current I2 to the load circuit 20 when the load circuit 20 is in the second operation mode;
the current flowing through the load circuit 20 in the second operation mode is larger than the current flowing through the load circuit 20 in the first operation mode.
For example, the load circuit 20 of the embodiment of the present disclosure may have at least two operation modes, wherein the first operation mode may be a low power consumption mode, and the load in the load circuit 20 may not be operated in the first operation mode, for example, in a standby state, where the current flowing through the load circuit 20 may be low. The second operation mode may be a high-performance mode in which the load in the load circuit 20 may be operating, for example, in a normal operation state, and the current flowing through the load circuit 20 may be high, that is, the current flowing through the load circuit 20 in the second operation mode is larger than the current flowing through the load circuit 20 in the first operation mode.
The disclosed embodiment provides a low dropout regulator unit 101 in the voltage regulating circuit 10, which can have the same function as the low dropout regulator of the prior art, and the output terminal a1 of the low dropout regulator unit 101 is connected to the input terminal c1 of the load circuit 20 for providing the output voltage and part or all of the load current to the load circuit 20.
Since the current (i.e. the load current) flowing in the load circuit 20 in the first operation mode is low, the load current in the first operation mode may be provided only by the low dropout regulator unit 101, for example, the first voltage V1 provided by the low dropout regulator unit 101 may be the output voltage, and the first current I1 provided by the low dropout regulator unit 101 may be the load current.
Since the current (i.e., the load current) flowing through the load circuit 20 in the second operation mode is relatively high, the embodiment of the present disclosure further provides an auxiliary unit 102 in the voltage regulating circuit, and an output terminal b1 of the auxiliary unit 102 is connected to the output terminal a1 of the low dropout regulator unit 101 and the input terminal c1 of the load circuit 20, so that the low dropout regulator unit 101 can be used to provide a part of the load current in the second operation mode, and the auxiliary unit 102 can be used to provide another part of the load current in the second operation mode. Thus, in the second operation mode, the load current may be provided by the low dropout regulator unit 101 and the auxiliary unit 102, for example, the first voltage V1 provided by the low dropout regulator unit 101 may be an output voltage (i.e. an input voltage of the load), and the sum of the first current I1 provided by the low dropout regulator unit 101 and the second current I2 provided by the auxiliary unit 102 may be the load current (i.e. an input current of the load).
According to the voltage regulating circuit disclosed by the embodiment of the disclosure, the low dropout regulator unit and the auxiliary unit are arranged, and the output end of the low dropout regulator unit is connected with the input end of the load circuit and the output end of the auxiliary unit, so that when the load circuit is in a first working mode, the low dropout regulator unit can provide a first voltage and a first current for the load circuit to serve as an output voltage and a load current; when the load circuit is in the second working mode, on the basis that the low dropout regulator unit provides the first voltage and the first current for the load circuit, the auxiliary unit can provide the second current for the load circuit, the first voltage is used as the output voltage, and the first current and the second current are used as the load current, so that the requirement that larger current flows in the load circuit in the second working mode can be met. The second current exists, so that the fluctuation of the first current is smaller when the working mode of the load circuit is switched, and the transient response of the low dropout regulator unit can be optimized; meanwhile, static power consumption current of the low dropout regulator unit does not need to be increased or higher power supply voltage does not need to be set for the low dropout regulator unit, and the low dropout regulator unit with more balanced parameters is realized.
Fig. 4 shows an exemplary structural schematic diagram of the low dropout regulator unit 101 according to an embodiment of the present disclosure.
In one possible implementation, as shown in fig. 4, the low dropout regulator unit 101 comprises an operational amplifier OP and a first transistor M1,
a first input end o1 of the operational amplifier OP is connected with the reference voltage V0, a second input end o2 of the operational amplifier OP is connected with the second pole M12 of the first transistor M1, and an output end o3 of the operational amplifier OP is connected with the gate M13 of the first transistor M1;
the first pole M11 of the first transistor M1 is used as the input terminal a2 of the low dropout regulator unit 101, and is connected to the second supply voltage V20; the second pole M12 of the first transistor M1 serves as the output a1 of the low dropout regulator unit 101.
The low dropout regulator unit 101 of the disclosed embodiment can be implemented based on the prior art. The first transistor M1 may be a PMOS transistor or an NMOS transistor, which is not limited by the embodiments of the present disclosure. When the first transistor M1 is a PMOS transistor, the first pole M11 of the first transistor M1 may be a source, and the second pole M12 of the first transistor M1 may be a drain; when the first transistor M1 is an NMOS transistor, the first pole M11 of the first transistor M1 may be a drain, and the second pole M12 of the first transistor M1 may be a source. When the first transistor M1 is a PMOS transistor, the first input o1 of the operational amplifier OP may be an inverting input, and the second input o2 of the operational amplifier OP may be a non-inverting input. When the first transistor M1 is an NMOS transistor, the first input o1 of the operational amplifier OP may be a non-inverting input, and the second input o2 of the operational amplifier OP may be an inverting input.
An exemplary method for implementing output voltage regulation by the low dropout regulator unit 101 and the auxiliary unit 102 will be briefly described below, taking the example where the first transistor M1 is a PMOS transistor. Fig. 5a shows a schematic diagram of an exemplary method for implementing output voltage regulation by the low dropout regulator unit 101 and the auxiliary unit 102 according to an embodiment of the present disclosure.
As can be seen from the above description of fig. 1, the low dropout regulator originally aims to ensure the stability of the output voltage, so the ideal output voltage (i.e. the first voltage) of the low dropout regulator unit 101 should be a fixed value no matter how much load current needs to be provided to the load circuit 20. However, as shown in fig. 5a, since the load circuit 20 needs to be continuously switched between the first operation mode with low power consumption and the second operation mode with high performance, and the change of the load current at the moment of switching inevitably causes the change of the first voltage, the low dropout regulator unit 101 needs to respond to the change of the first voltage to adjust the first voltage through the operational amplifier OP and the first transistor M1, so that the first voltage is stabilized, for example, recovered to a fixed value. In this process, the fluctuation of the voltage value of the first voltage may be referred to as ripple. The voltage regulating circuit of the embodiment of the disclosure can suppress the change of the first voltage and reduce the amplitude of ripple by enabling the auxiliary unit to provide the second current or not to provide the second current when the load circuit is switched in the mode, thereby realizing the effect of optimizing the transient response.
Fig. 5b illustrates an example of the current generated by the voltage regulation circuit during load circuit mode switching according to an embodiment of the present disclosure.
As shown in fig. 5b, when EN is equal to 0, it indicates that the load circuit 20 operates in the first operation mode, when EN is equal to 1, it indicates that the load circuit 20 operates in the second operation mode, and when the load circuit 20 is switched from the first operation mode to the second operation mode, the load current (I in fig. 5b) is applied (I in fig. 5b) L ) Suddenly increasing, e.g. without taking the auxiliary unit 102 into account, i.e. as in the prior art power supply, the load current I L Suddenly increased load current I when all supplied by low dropout regulator unit 101 L The output voltage (i.e. the first voltage) of the low dropout regulator unit is inevitably pulled down, and the reduction degree of the first voltage is relatively large, even if the low dropout regulator unit can respond to the change of the first voltage and increase the voltage value of the first voltage to be close to the fixed value when the first voltage is stable, the fluctuation of the voltage value of the first voltage is inevitably caused in the process, namely the amplitude of ripple is very large.
However, in the embodiment of the present disclosure, when the load circuit 20 switches from the first operation mode to the second operation mode, the auxiliary unit 102 starts to provide the second current I2, so the effect of the switching moment on the current output by the low dropout regulator unit 101 is relatively small, and as can be seen from fig. 5b, the high level thereof is much lower than the load current I L A higher degree. On the basis, the degree of decrease of the first voltage is also relatively small, so that the degree of decrease of the voltage input to the second input terminal o2 (non-inverting input terminal) of the operational amplifier OP is also relatively small, and the reference voltage V0 connected to the first input terminal o1 (inverting input terminal) of the operational amplifier OP is not changed, so that the degree of decrease of the voltage difference between the non-inverting input terminal and the inverting input terminal is relatively small, and the degree of decrease of the voltage output from the output terminal o3 of the operational amplifier OP, that is, the gate voltage of the first transistor M1 is also relatively small. The second power supply voltage V20 connected to the source of the first transistor M1 is unchanged, so the absolute value of the gate-source voltage of the first transistor M1 is increased to a smaller extent, and the current flowing through the first transistor M1 is also increased to a smaller extent, that is, the first current I1 output by the low dropout regulator unit 101 is also increased to a smaller extent, so that the first voltage is increased to a smaller extent, and approaches a fixed value when the first voltage is stable. It can be seen that, in the process of switching the first operating mode to the second operating mode, the mode switching makes the degree of reduction of the first voltage small, and the low dropout regulator unit 101 makes the degree of increase of the first voltage small, so that the fluctuation of the voltage value of the first voltage is small, and the amplitude of ripple can be reduced when the load circuit 20 is switched from the first operating mode to the second operating mode, thereby achieving the effect of optimizing transient response.
When the load circuit 20 is switched from the second operation mode to the first operation mode, the load current (I in fig. 5b) L ) Suddenly reduced, e.g. without taking the auxiliary unit 102 into account, i.e. as in the prior art power supply, the load current I L Suddenly reduced load current I when supplied entirely by the LDO unit 101 L The output voltage (i.e. the first voltage) of the low dropout regulator unit is inevitably increased, and the increasing degree of the first voltage is relatively large, even if the low dropout regulator unit can respond to the change of the first voltage and reduce the voltage value of the first voltage to be close to the fixed value when the first voltage is stable, the fluctuation of the voltage value of the first voltage is inevitably caused in the process, namely the amplitude of ripple is very large.
However, in the embodiment of the present disclosure, when the load circuit 20 is switched from the second operation mode to the first operation mode, the auxiliary unit 102 no longer provides the second current I2, so the effect of the switching moment on the current output by the low dropout regulator unit 101 is relatively small, and as can be seen from fig. 5b, the current becomes much lower than the load current I L A lower degree. On the basis, the increase degree of the first voltage is smaller, so the increase degree of the voltage input to the second input terminal o2 (non-inverting input terminal) of the operational amplifier OP is smaller, and the reference voltage V0 connected to the first input terminal o1 (inverting input terminal) of the operational amplifier OP is not changed, so the voltage difference between the non-inverting input terminal and the inverting input terminal may be increased to a smaller degree, and the voltage output by the output terminal o3 of the operational amplifier OP, that is, the gate voltage of the first transistor M1 is raised to a smaller degree. The second power supply voltage V20 connected to the source of the first transistor M1 is unchanged, so that the absolute value of the gate-source voltage of the first transistor M1 decreases to a smaller extent, and the current flowing through the first transistor M1 decreases to a smaller extent, that is, the first current I1 output by the low dropout regulator unit 101 decreases to a smaller extent, so that the first voltage decreases to a smaller extent, and approaches a fixed value when the first voltage is stable. It can be seen that, in the process of switching the second operating mode to the first operating mode, the mode switching causes a small increase in the output power, and the low dropout regulator unit causes a small decrease in the first voltage, and therefore, the first voltage is reducedThe voltage value of the voltage has small fluctuation, and the ripple amplitude can be reduced when the load circuit is switched from the second working mode to the first working mode, so that the effect of optimizing transient response is realized.
Taking the first transistor M1 as an example, it should be understood by those skilled in the art that, when the first transistor M1 is an NMOS transistor, the low dropout regulator unit and the auxiliary unit according to the embodiment of the present disclosure can also implement voltage regulation and reduce the magnitude of ripple, thereby achieving the effect of optimizing transient response, and the specific implementation manner of the low dropout regulator unit and the auxiliary unit is similar to that when the first transistor M1 is a PMOS transistor, and will not be described herein again.
When the first transistor M1 is a PMOS transistor, the voltage regulating circuit of the embodiment of the disclosure can optimize the transient response of the low dropout regulator unit without increasing the static current consumption of the low dropout regulator unit and without setting a higher supply voltage (i.e., the second supply voltage V20) for the low dropout regulator unit. When the first transistor M1 is an NMOS transistor, the voltage regulating circuit of the embodiment of the disclosure can optimize the transient response of the low dropout regulator unit without increasing the quiescent current of the low dropout regulator unit, but with a higher supply voltage (the second supply voltage V20) for the low dropout regulator unit. Therefore, it may be preferable that the first transistor M1 is a PMOS transistor.
The following describes an exemplary method by which the auxiliary unit of the disclosed embodiment implements the current for the load circuit in the second mode of operation.
Fig. 6 illustrates an exemplary block diagram of the auxiliary unit 102 according to an embodiment of the present disclosure.
In one possible implementation, the load circuit 20 receives the control signal EN, the load circuit 20 is in the first operation mode when the control signal EN is at the first level, the load circuit 20 is in the second operation mode when the control signal EN is at the second level,
the input terminal b2 of the auxiliary unit 102 is connected to the first power supply voltage V10, a first switch S1 is included between the input terminal b2 and the output terminal b1 of the auxiliary unit 102, the first switch S1 is further configured to receive a control signal EN, the first switch S1 is turned off when the control signal EN is at a first level, and the first switch S1 is turned on when the control signal EN is at a second level.
For example, the switching of the operation mode of the load circuit 20 may be controlled by a level change of the control signal EN (see fig. 5b for example), for example, when the control signal EN is at a first level (e.g., "0"), the load circuit 20 may be in a first operation mode, and when the control signal EN is at a second level (e.g., "1"), the load circuit 20 may be in a second operation mode, and then the control signal EN is changed from the first level to the second level, i.e., the operation mode of the load circuit 20 may be switched from the first operation mode to the second operation mode, and similarly, the control signal EN is changed from the second level to the first level, i.e., the operation mode of the load circuit 20 may be switched from the second operation mode to the first operation mode.
In this case, a first switch S1 may be disposed between the input terminal b2 and the output terminal b1 of the auxiliary unit 102, and when the first switch S1 is turned on, the input terminal b2 and the output terminal b1 of the auxiliary unit 102 are also turned on, so that the auxiliary unit 102 can output the second current I2 according to the first supply voltage V10; when the first switch S1 is turned off, the connection between the input terminal b2 and the output terminal b1 of the auxiliary unit 102 is also turned off, so that the auxiliary unit 102 no longer outputs the second current. The turning on or off of the first switch S1 may be set to be controlled by the control signal EN, for example, the control signal EN is at a first level to turn off the first switch S1, and the control signal EN is at a second level to turn on the first switch S1. Thus, when the first switch S1 is turned off, the load circuit 20 is in the first operating mode, the load current is low, and the auxiliary unit 102 does not need to supply current; when the first switch S1 is turned on, the load circuit 20 is in the second operation mode, the load current is high, and the auxiliary unit 102 can just provide current for the load circuit 20. Therefore, different requirements of the application scene of the working mode switching of the load circuit on the load current can be met.
In one possible implementation, the value of the second current I2 is smaller than the value of the current flowing in the load circuit in the second operation mode.
For example, the first current I1 is a current provided by the first transistor M1, and the value thereof can be automatically adjusted by the first transistor M1 according to the load current requirement. Therefore, when the second current I2 is a fixed value, the automatically adjustable first current can make the sum of the first current I1 and the second current I2 meet the requirement of the load current. It should be noted that, since the second current I2 is provided when the load circuit 20 is in the second operation mode, if the value of the second current I2 is greater than the value of the load current requirement, the first current I1 cannot be automatically adjusted, so that when the auxiliary unit 102 is set, the value of the current flowing in the load circuit 20 in the second operation mode, for example, a first threshold value, should be determined, and the value of the second current I1 is smaller than the first threshold value. Further, the value of the second current I1 can be fixed, and the fixed value of the second current I1 can be implemented in a more compact circuit for the auxiliary unit 102, which can reduce the complexity of the voltage regulating circuit 10.
It should be understood by those skilled in the art that in practical applications, the auxiliary unit may also be configured to output the adjustable second current according to requirements of application scenarios, as long as the value of the second current is smaller than the value of the current flowing in the load circuit in the second operation mode, and the disclosure does not limit whether the second current is a fixed value.
Fig. 7a illustrates an exemplary block diagram of the auxiliary unit 102 according to an embodiment of the disclosure.
In one possible implementation, as shown in fig. 7a, the auxiliary unit 102 further includes a resistor R1, and the resistor R1 and the first switch S1 are connected in series between the input terminal b2 and the output terminal b1 of the auxiliary unit 102.
For example, the input terminal b2 of the auxiliary unit 102 is connected to the first power supply voltage V10, and the first switch S1 is included between the input terminal b2 and the output terminal b1 of the auxiliary unit 102, so that the first switch S1 is connected in series to a resistor R1, and the resistance of the resistor R1 is set, so that the output terminal b1 of the auxiliary unit 102 can output the second current I2 with a certain value under the condition that the first power supply voltage V10 is constant. In the example of fig. 7a, the first terminal S1 of the first switch S1 is used as the input terminal b2 of the auxiliary unit 102, the second terminal S2 of the first switch S1 is connected to the first terminal R1 of the resistor R1, and the second terminal R2 of the resistor R1 is used as the output terminal b1 of the auxiliary unit 102. Those skilled in the art will understand that the positions of the first switch S1 and the resistor R1 may also have other arrangements, such as the first switch S1 being connected to the output terminal b1 of the auxiliary unit 102, the resistor R1 being connected to the input terminal b2 of the auxiliary unit 102, and so on, and the present disclosure is not limited to the specific arrangement of the positions of the first switch S1 and the resistor R1.
Fig. 7b illustrates another exemplary block diagram of the auxiliary unit 102 according to an embodiment of the disclosure.
In one possible implementation, as shown in fig. 7b, the auxiliary unit 102 further comprises a current source CS, the current source CS and the first switch S1 being connected in series between the input terminal b2 and the output terminal b1 of the auxiliary unit 102.
For example, the input b2 of the auxiliary unit 102 is connected to the first supply voltage V10, and the first switch S1 is included between the input b2 and the output b1 of the auxiliary unit 102, so that the first switch S1 is connected in series to a current source CS, and parameters of the current source CS (for example, a current that can be output by the current source CS) are set, so that the output b1 of the auxiliary unit 102 can output a certain value of the second current I2 when the first supply voltage V10 is determined. In the example of fig. 7b, the first terminal CS1 of the current source CS serves as the input terminal b2 of the auxiliary unit 102, the second terminal CS2 of the current source CS is connected to the first terminal S1 of the first switch S1, and the second terminal S2 of the first switch S1 serves as the output terminal b1 of the auxiliary unit 102. It will be understood by those skilled in the art that the positions of the first switch S1 and the current source CS may also have other arrangements, such as connecting the first switch S1 to the input b2 of the auxiliary unit 102, connecting the current source CS to the output b1 of the auxiliary unit 102, etc., and the present disclosure is not limited to the specific arrangement of the positions of the first switch S1 and the current source CS.
It should be understood by those skilled in the art that the auxiliary unit may be arranged in any manner other than the above examples, as long as the second current with a certain value can be output when the load circuit is in the second operation mode, and the second current is not output when the load circuit is in the first operation mode. In this way, the flexibility of the structure of the auxiliary unit can be improved.
In one possible implementation, the first supply voltage V10 and the second supply voltage V20 are the same.
For example, for the prior art low dropout regulator, one of the supply voltages connected to the prior art low dropout regulator may be the same as the second supply voltage V20 connected to the low dropout regulator unit 101 in the embodiment of the present disclosure. Since the auxiliary unit 102 is added to the embodiment of the disclosure, and the input end b2 of the auxiliary unit 102 is connected to the first power supply voltage V10, the first power supply voltage V10 and the second power supply voltage can be the same as V20. In this case, the voltage regulating circuit 10 has a simpler structure and lower hardware cost in practical application.
In a possible implementation manner, the first supply voltage V10 and the second supply voltage V20 are different, and the value of the first supply voltage V20 is smaller than the first threshold.
For example, assuming that the first transistor M1 in the ldo unit 101 is an NMOS transistor, the voltage value of the second supply voltage V20 needs to be set slightly higher according to the turn-on condition of the NMOS transistor. If the second supply voltage V20 is not required to be high when the second current I2 is supplied, the first supply voltage V10 and the second supply voltage V20 may be made different, and the value of the first supply voltage V10 is controlled to be smaller than the first threshold value, so that the value of the first supply voltage V10 may be made lower. In this case, the power consumption of the voltage regulating circuit 10 in practical use is smaller.
In a possible implementation manner, an embodiment of the present disclosure further provides a driving chip, which includes at least one voltage regulating circuit described above, and the driving chip is configured to drive at least one load circuit. The load circuit may be disposed on the driving chip, or may be disposed on another chip/device/module connected to the driving chip, which is not limited in this application.
In a possible implementation manner, an embodiment of the present disclosure further provides an electronic device, which includes at least one load circuit and at least one voltage regulation circuit described above.
The present disclosure is not limited to a specific connection manner of the at least one load circuit and the at least one voltage regulation circuit in the electronic device.
In one possible implementation, the electronic device comprises a display or a portable device.
The electronic device in the present embodiment includes, but is not limited to, a desktop computer, a television, a mobile device with a large-sized screen, such as a mobile phone, a tablet computer, and other common electronic devices including a load.
The electronic device may also be, for example, a User Equipment (UE), a mobile device, a User terminal, a handheld device, a computing device, or a vehicle-mounted device, and some examples of the terminal are: a display, a Smart Phone or a portable device, a Mobile Phone (Mobile Phone), a tablet computer, a notebook computer, a palmtop computer, a Mobile Internet Device (MID), a wearable device, a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in Industrial Control (Industrial Control), a wireless terminal in unmanned driving (self), a wireless terminal in Remote Surgery (Remote Surgery), a wireless terminal in Smart Grid, a wireless terminal in Transportation Safety (Transportation Safety), a wireless terminal in Smart City (Smart City), a wireless terminal in Smart Home (Smart Home), a wireless terminal in car networking, and the like. For example, the server may be a local server or a cloud server.
The above description is intended to be illustrative of the present invention and not to limit the scope of the invention, which is defined by the claims appended hereto.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
It should be noted that, in this document, the contained terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (11)

1. A voltage regulation circuit, characterized in that the voltage regulation circuit comprises a low dropout regulator unit and an auxiliary unit,
the output end of the low dropout regulator unit is connected with the input end of a load circuit and the output end of the auxiliary unit and is used for providing a first voltage and a first current for the load circuit when the load circuit is in a first working mode and a second working mode;
the auxiliary unit is used for providing a second current for the load circuit when the load circuit is in a second working mode;
and the current flowing in the load circuit in the second working mode is larger than the current flowing in the load circuit in the first working mode.
2. The voltage regulation circuit of claim 1, wherein the load circuit receives a control signal, the load circuit being in a first mode of operation when the control signal is at a first level, the load circuit being in a second mode of operation when the control signal is at a second level,
the input end of the auxiliary unit is connected with a first power supply voltage, a first switch is arranged between the input end and the output end of the auxiliary unit, the first switch is further used for receiving the control signal, the first switch is switched off when the control signal is at a first level, and the first switch is switched on when the control signal is at a second level.
3. The voltage regulation circuit of claim 2, wherein the auxiliary unit further comprises a resistor, the resistor and the first switch being connected in series between the input and output of the auxiliary unit.
4. The voltage regulating circuit of claim 2, wherein the auxiliary unit further comprises a current source, the current source and the first switch being connected in series between the input and the output of the auxiliary unit.
5. The voltage regulation circuit of claim 1, wherein the magnitude of the second current is less than the magnitude of the current flowing in the load circuit in the second mode of operation.
6. The voltage regulation circuit of claim 1, wherein the LDO unit comprises an operational amplifier and a first transistor,
a first input end of the operational amplifier is connected with a reference voltage, a second input end of the operational amplifier is connected with a second pole of the first transistor, and an output end of the operational amplifier is connected with a grid electrode of the first transistor;
a first electrode of the first transistor is used as an input end of the low dropout voltage regulator unit and is connected with a second power supply voltage; and the second pole of the first transistor is used as the output end of the low dropout regulator unit.
7. The voltage regulation circuit of claim 6, wherein the first supply voltage and the second supply voltage are the same.
8. The voltage regulation circuit of claim 6, wherein the first supply voltage and the second supply voltage are different, and wherein the first supply voltage has a value less than a first threshold.
9. A driver chip comprising at least one voltage regulating circuit according to any one of claims 1-8, the driver chip being configured to drive at least one load circuit.
10. An electronic device comprising at least one load circuit and at least one voltage regulation circuit according to any one of claims 1-8.
11. The electronic device of claim 10, wherein the electronic device comprises a display or a portable device.
CN202210769543.4A 2022-06-30 2022-06-30 Voltage regulating circuit, driving chip and electronic equipment Active CN115079761B (en)

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EP2354881A1 (en) * 2010-02-05 2011-08-10 Dialog Semiconductor GmbH Domino voltage regulator (DVR)
CN102495656A (en) * 2011-12-09 2012-06-13 电子科技大学 Low dropout linear regulator
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CN105334900A (en) * 2015-11-19 2016-02-17 成都华微电子科技有限公司 Fast transient response low-dropout linear voltage regulator
CN113342106A (en) * 2021-06-04 2021-09-03 广东希荻微电子股份有限公司 Low dropout regulator and control system
US20210311516A1 (en) * 2020-04-03 2021-10-07 Wuxi Petabyte Technologies Co., Ltd. Digital low-dropout regulator (dldo) with fast feedback and optimized frequency response

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2354881A1 (en) * 2010-02-05 2011-08-10 Dialog Semiconductor GmbH Domino voltage regulator (DVR)
CN102495656A (en) * 2011-12-09 2012-06-13 电子科技大学 Low dropout linear regulator
CN103885517A (en) * 2012-12-20 2014-06-25 北京兆易创新科技股份有限公司 Low-dropout regulator and control method of low-dropout regulator output voltage
CN204242021U (en) * 2014-12-04 2015-04-01 成都信息工程学院 A kind of low pressure difference linear voltage regulator driving large current load
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CN113342106A (en) * 2021-06-04 2021-09-03 广东希荻微电子股份有限公司 Low dropout regulator and control system

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