CN113970947A - Low dropout regulator and electronic equipment - Google Patents
Low dropout regulator and electronic equipment Download PDFInfo
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- CN113970947A CN113970947A CN202010724260.9A CN202010724260A CN113970947A CN 113970947 A CN113970947 A CN 113970947A CN 202010724260 A CN202010724260 A CN 202010724260A CN 113970947 A CN113970947 A CN 113970947A
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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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Abstract
The application discloses a low dropout regulator and electronic equipment, wherein the low dropout regulator comprises an amplifier, a first power tube, a feedback circuit and a load current regulating circuit, wherein the positive input end of the amplifier is used for inputting a reference voltage; the first power tube is an N-type field effect transistor or an NPN-type triode transistor, the control end of the first power tube is connected with the output end of the amplifier, the input end of the first power tube is used for inputting power voltage, and the output end of the first power tube is connected with a load so as to output driving voltage to drive the load; the feedback circuit is connected with the output end of the first power tube and the reverse input end of the amplifier; the load current adjusting circuit is connected with the output end of the first power tube and used for sensing the change of the driving voltage and adjusting the driving current output by the output end of the first power tube according to the change of the driving voltage so as to improve the change speed of the driving voltage. By the mode, the performance of the load can be improved.
Description
Technical Field
The present disclosure relates to circuit technologies, and particularly to a low dropout regulator and an electronic device.
Background
Low dropout regulators (LDOs) are a new generation of integrated circuit voltage regulators, which are low-consumption micro System On Chip (SOC). The circuit can be used for controlling a current main channel, hardware circuits such as a power tube with an extremely low on-line on-resistance, a diode, a sampling resistor, a divider resistor and the like are integrated on a chip, and the circuit has the functions of overcurrent protection, over-temperature protection, a precision reference source, a differential amplifier, a delayer and the like.
When the load of the LDO changes, the output voltage of the LDO may become too high or too low with the change of the load, further causing the load to have too large voltage change, which affects the performance of the load.
Disclosure of Invention
In order to solve the above problems, the present application provides a low dropout regulator and an electronic device, which can improve the performance of a load.
The technical scheme adopted by the application is as follows: provided is a low dropout linear regulator, including: the positive input end of the amplifier is used for inputting a reference voltage; the first power tube is an N-type field effect transistor or an NPN-type triode transistor, the control end of the first power tube is connected with the output end of the amplifier, the input end of the first power tube is used for inputting power voltage, and the output end of the first power tube is connected with a load so as to output driving voltage to drive the load; the feedback circuit is connected with the output end of the first power tube and the reverse input end of the amplifier; and the load current regulating circuit is connected with the output end of the first power tube and used for sensing the change of the driving voltage and regulating the driving current output by the output end of the first power tube according to the change of the driving voltage so as to improve the change speed of the driving voltage.
Wherein, load current regulation circuit includes: the induction circuit is connected with the first power tube and used for inducing the current of the first power tube; and the pre-loading circuit is connected with the sensing circuit and the output end of the first power tube and is used for forming a pre-loading current according to the sensed current of the first power tube, adjusting the pre-loading current according to the change of the driving voltage and further adjusting the driving current so as to improve the change speed of the driving voltage.
Wherein, the induction circuit includes: and the second power tube is an N-type field effect transistor or an NPN-type triode transistor, the control end of the second power end is connected with the control end of the first power tube, the input end of the second power tube is used for inputting power supply voltage, and the output end of the second power tube is connected with the preloading circuit.
The induction current conversion proportionality coefficient of the first power tube and the second power tube is larger than 1.
Wherein the preload circuit comprises: the input end of the third power tube is connected with the output end of the second power tube, the output end of the third power tube is grounded, and the control end of the third power tube is connected with the input end of the third power tube; the input end of the fourth power tube is connected with the output end of the first power tube, the output end of the fourth power tube is grounded, and the control end of the fourth power tube is connected with the control end of the third power tube; the first end of the first capacitor is connected with the output end of the first power tube, and the second end of the first capacitor is connected with the control end of the fourth power tube; the input end of the fifth power tube is connected with the output end of the second power tube, and the output end of the fifth power tube is connected with the input end of the third power tube; and the input end of the sixth power tube is connected with the output end of the first power tube, the output end of the sixth power tube is connected with the input end of the fourth power tube, and the control end of the sixth power tube is connected with the control end of the fifth power tube.
And the induction current conversion proportionality coefficient of the third power tube and the fourth power tube is less than 1.
And the induction current conversion proportionality coefficient of the fifth power tube and the sixth power tube is less than 1.
The third power tube, the fourth power tube, the fifth power tube and the sixth power tube are N-type field effect transistors or NPN-type triode transistors.
Wherein, feedback circuit includes: the first end of the first resistor is connected with the output end of the first power tube, and the second end of the first resistor is connected with the reverse input end of the amplifier; and the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is grounded.
Another technical scheme adopted by the application is as follows: an electronic device is provided, which comprises the low dropout linear regulator as described above.
The application provides a low dropout linear regulator includes: the positive input end of the amplifier is used for inputting a reference voltage; the first power tube is an N-type field effect transistor or an NPN-type triode transistor, the control end of the first power tube is connected with the output end of the amplifier, the input end of the first power tube is used for inputting power voltage, and the output end of the first power tube is connected with a load so as to output driving voltage to drive the load; the feedback circuit is connected with the output end of the first power tube and the reverse input end of the amplifier; and the load current regulating circuit is connected with the output end of the first power tube, is used for sensing the change of the driving voltage and regulating the driving current output by the output end of the first power tube according to the change of the driving voltage. Through the mode, the load current can be correspondingly adjusted according to the change condition of the driving voltage of the output end, on one hand, real-time response can be carried out when the voltage of the load changes, and the load current is increased or decreased so as to avoid influencing the performance of the load, on the other hand, the load current is changed in real time according to the change of the induction voltage, the change speed of the driving voltage is further improved, and quick response is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:
fig. 1 is a schematic structural diagram of a first embodiment of a low dropout regulator provided in the present application;
fig. 2 is a schematic structural diagram of a second embodiment of the low dropout regulator provided in the present application;
fig. 3 is a schematic structural diagram of a third embodiment of the low dropout regulator provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic diagram of a first embodiment of the low dropout regulator 100 provided in the present application, and the low dropout regulator 100 includes an amplifier 10, a first power transistor M1, a feedback circuit 20, and a load current regulating circuit 30, wherein the first power transistor M1 is an N-type field effect transistor.
Wherein one input terminal of the amplifier 10 is used for inputting a reference voltage Vref(ii) a The control end of the first power tube M1 is connected to the output end of the amplifier 10, the input end of the first power tube M1 is used for inputting a power supply voltage VDD, and the output end of the first power tube M1 is connected to the load to output a driving voltage VO to drive the load; the feedback circuit 20 connects the output terminal of the first power transistor M1 with the other input terminal of the amplifier 10And (4) an end. The load current adjusting circuit 30 is connected to the output terminal of the first power transistor M1, and is configured to sense a change of the driving voltage VO, and adjust the driving current I0 output from the output terminal of the first power transistor M1 according to the change of the driving voltage VO, so as to increase a change speed of the driving voltage VO.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a second embodiment of the low dropout regulator 100 provided in the present application, where the low dropout regulator 100 includes an amplifier 10, a first power transistor M1, a feedback circuit 20, and a load current regulating circuit 30, and the power transistor M1 is an N-type field effect transistor.
Wherein the positive input terminal (+) of the amplifier 10 is used for inputting the reference voltage Vref(ii) a The control end of the first power tube M1 is connected to the output end of the amplifier 10, the input end of the first power tube M1 is used for inputting a power supply voltage VDD, and the output end of the first power tube M1 is connected to the load to output a driving voltage VO to drive the load; the feedback circuit 20 connects the output terminal of the first power transistor M1 and the inverting input (-) of the amplifier 10. The load current adjusting circuit 30 is connected to the output terminal of the first power transistor M1, and is configured to sense a change of the driving voltage VO, and adjust the driving current I0 output from the output terminal of the first power transistor M1 according to the change of the driving voltage VO, so as to increase a change speed of the driving voltage VO.
The load current adjusting circuit 30 includes an inductive circuit and a preload circuit. The sensing circuit is used for sensing the current of the first power tube, the preloading circuit forms preloading current according to the sensed current of the first power tube M1, the preloading current is adjusted according to the change of the driving voltage VO, and then the driving current is adjusted, so that the change speed of the driving voltage VO is improved.
Specifically, the sensing circuit includes a second power transistor M2, the second power transistor M2 is an N-type field effect transistor, a control terminal of a second power terminal M2 is connected to a control terminal of the first power transistor M1, an input terminal of the second power transistor M2 is used for inputting the supply voltage VDD, and an output terminal of the second power transistor M2 is connected to the preload circuit.
Specifically, the preload circuit includes a third power transistor M3, a fourth power transistor M4, and a first capacitor C1. The input end of the third power tube M3 is connected to the output end of the second power tube M2, the output end of the third power tube M3 is grounded, and the control end of the third power tube M3 is connected to the input end of the third power tube M3; the input end of the fourth power tube M4 is connected to the output end of the first power tube M1, the output end of the fourth power tube M4 is grounded, and the control end of the fourth power tube M4 is connected to the control end of the third power tube M3; the first end of the first capacitor C1 is connected to the output end of the first power transistor M1, and the second end of the first capacitor C1 is connected to the control end of the fourth power transistor M4.
The load current adjusting circuit 30 further includes a fifth power transistor M5 and a sixth power transistor M6. The input end of the fifth power tube M5 is connected with the output end of the second power tube M2, and the output end of the fifth power tube M5 is connected with the input end of the third power tube M3; an input end of the sixth power tube M6 is connected to an output end of the first power tube M1, an output end of the sixth power tube M6 is connected to an input end of the fourth power tube M4, and a control end of the sixth power tube M6 is connected to a control end of the fifth power tube M5, wherein a control end of the sixth power tube M6 and a control end of the fifth power tube M5 are connected to a VB point, and the VB point is a bias control point.
In this embodiment, since the control terminals of the fifth power transistor M5 and the sixth power transistor are connected together, the current induced in the first power transistor M1 by the second power transistor M2 is more accurate by controlling the bias control point VB.
Optionally, in the above embodiment, the third power transistor M3, the fourth power transistor M4, the fifth power transistor M5 and the sixth power transistor M6 are N-type field effect transistors.
In operation, since the control terminals of the first power transistor M1 and the second power transistor M2 are connected, and the input terminals of the first power transistor M1 and the second power transistor M2 are both connected to the power supply voltage VDD, the second power transistor M2 can sense the current of the first power transistor M1. Further, the pre-load current (current through M4) is scaled via the third power tube M3 and the fourth power tube M4.
When the load is decreasing, the voltage of the driving voltage VO is increased, and the voltage difference is coupled to the control terminals of the third power transistor M3 and the fourth power transistor M4 through the C1, so that the voltage at the control terminal of the fourth power transistor M4 is increased, and at this time, the current flowing through the fourth power transistor M4 is increased, that is, the load current is increased on the driving voltage VO, and the excessive energy on the driving voltage VO is extracted, so that the driving voltage VO is decreased, and a fast response effect is achieved.
When the load increases, the voltage of the driving voltage VO decreases, and the voltage difference is coupled to the control terminals of the third power transistor M3 and the fourth power transistor M4 through the C1, so that the voltage at the control terminal of the fourth power transistor M4 decreases, and at this time, the current flowing through the fourth power transistor M4 decreases, that is, the load current decreases at the driving voltage VO, and insufficient energy is provided at the driving voltage VO, so that the driving voltage VO increases, and a quick response effect is achieved.
Optionally, in an embodiment, the ratio of the induced current conversion of the first power transistor M1 to the second power transistor M2 is greater than 1, that is, the ratio of the induced current conversion of the first power transistor M1 to the second power transistor M2 is N: 1, N > 1.
Optionally, in an embodiment, the induced current conversion scaling factor of the third power transistor M3 and the fourth power transistor M4 is smaller than 1. That is, the ratio of the induced current conversion from the third power tube M3 to the fourth power tube M4 is 1: k, K > 1.
Optionally, in an embodiment, the ratio of the induced current conversion proportionality of the fifth power tube M5 to the sixth power tube M6 is less than 1. That is, the ratio of the induced current conversion from the fifth power tube M5 to the sixth power tube M6 is 1: k, K > 1.
Unlike the prior art, the low dropout regulator provided in the above embodiment includes: the positive input end of the amplifier is used for inputting a reference voltage; the first power tube is an N-type field effect transistor or an NPN-type triode transistor, the control end of the first power tube is connected with the output end of the amplifier, the input end of the first power tube is used for inputting power voltage, and the output end of the first power tube is connected with a load so as to output driving voltage to drive the load; the feedback circuit is connected with the output end of the first power tube and the reverse input end of the amplifier; and the load current regulating circuit is connected with the output end of the first power tube, is used for sensing the change of the driving voltage and regulating the driving current output by the output end of the first power tube according to the change of the driving voltage. Through the mode, the load current can be correspondingly adjusted according to the change condition of the driving voltage of the output end, on one hand, real-time response can be carried out when the voltage of the load changes, and the load current is increased or decreased so as to avoid influencing the performance of the load, on the other hand, the load current is changed in real time according to the change of the induction voltage, the change speed of the driving voltage is further improved, and quick response is realized.
It is understood that in the above embodiments, the power Transistor may be one or more of a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), an Injection Enhanced Gate Transistor (IEGT), and the like.
In addition, in other embodiments, the power transistor may also adopt a triode transistor, as shown in fig. 3, fig. 3 is a schematic structural diagram of a third embodiment of the low dropout regulator provided in the present application, wherein M1-M6 are all NPN type triode transistors, and the operation principle thereof is similar to that of the above embodiments and will not be described in detail herein.
In addition, the present application also provides an electronic device including the low dropout regulator provided in the above embodiment. It is to be understood that the electronic devices described above may be smart devices, home appliances, network devices, etc., which are not examples herein.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other manners. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made according to the content of the present specification and the accompanying drawings, or which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A low dropout regulator, comprising:
the positive input end of the amplifier is used for inputting a reference voltage;
the first power tube is an N-type field effect transistor or an NPN-type triode transistor, a control end of the first power tube is connected with an output end of the amplifier, an input end of the first power tube is used for inputting power voltage, and an output end of the first power tube is connected with a load so as to output driving voltage to drive the load;
the feedback circuit is connected with the output end of the first power tube and the inverting input end of the amplifier;
and the load current regulating circuit is connected with the output end of the first power tube and used for sensing the change of the driving voltage and regulating the driving current output by the output end of the first power tube according to the change of the driving voltage so as to improve the change speed of the driving voltage.
2. The low dropout regulator according to claim 1,
the load current regulation circuit includes:
the induction circuit is connected with the first power tube and used for inducing the current of the first power tube;
and the pre-loading circuit is connected with the sensing circuit and the output end of the first power tube and is used for forming a pre-loading current according to the sensed current of the first power tube, adjusting the pre-loading current according to the change of the driving voltage and further adjusting the driving current so as to improve the change speed of the driving voltage.
3. The low dropout regulator according to claim 2,
the sensing circuit includes:
the second power tube is an N-type field effect transistor or an NPN-type triode transistor, a control end of the second power end is connected with a control end of the first power tube, an input end of the second power tube is used for inputting the power voltage, and an output end of the second power tube is connected with the preloading circuit.
4. The low dropout regulator according to claim 3,
the ratio coefficient of induction current conversion of the first power tube and the second power tube is larger than 1.
5. The low dropout regulator according to claim 3,
the preload circuit includes:
the input end of the third power tube is connected with the output end of the second power tube, the output end of the third power tube is grounded, and the control end of the third power tube is connected with the input end of the third power tube;
an input end of the fourth power tube is connected with an output end of the first power tube, an output end of the fourth power tube is grounded, and a control end of the fourth power tube is connected with a control end of the third power tube;
a first end of the first capacitor is connected with the output end of the first power tube, and a second end of the first capacitor is connected with the control end of the fourth power tube;
the input end of the fifth power tube is connected with the output end of the second power tube, and the output end of the fifth power tube is connected with the input end of the third power tube;
the input end of the sixth power tube is connected with the output end of the first power tube, the output end of the sixth power tube is connected with the input end of the fourth power tube, and the control end of the sixth power tube is connected with the control end of the fifth power tube.
6. The low dropout regulator according to claim 5,
the ratio coefficient of induction current conversion of the third power tube to the fourth power tube is less than 1.
7. The low dropout regulator according to claim 5,
the induction current conversion proportionality coefficient of the fifth power tube and the sixth power tube is smaller than 1.
8. The low dropout regulator according to claim 5,
the third power tube, the fourth power tube, the fifth power tube and the sixth power tube are N-type field effect transistors or NPN-type triode transistors.
9. The low dropout regulator according to claim 1,
the feedback circuit includes:
a first end of the first resistor is connected with the output end of the first power tube, and a second end of the first resistor is connected with the inverting input end of the amplifier;
and the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is grounded.
10. An electronic device, characterized in that it comprises a low dropout linear regulator according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010724260.9A CN113970947A (en) | 2020-07-24 | 2020-07-24 | Low dropout regulator and electronic equipment |
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| CN202010724260.9A CN113970947A (en) | 2020-07-24 | 2020-07-24 | Low dropout regulator and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210216092A1 (en) * | 2020-01-09 | 2021-07-15 | Mediatek Inc. | Reconfigurable series-shunt ldo |
| WO2023226969A1 (en) * | 2022-05-24 | 2023-11-30 | 芯海科技（深圳）股份有限公司 | Current stabilizing circuit and current stabilizing method therefor, integrated circuit, and electronic device |
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| CN107102665A (en) * | 2016-02-22 | 2017-08-29 | 联发科技（新加坡）私人有限公司 | Low pressure difference linear voltage regulator |
| US20180095489A1 (en) * | 2016-09-30 | 2018-04-05 | Kilopass Technology, Inc. | Circuit for Low-Dropout Regulator Output |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107102665A (en) * | 2016-02-22 | 2017-08-29 | 联发科技（新加坡）私人有限公司 | Low pressure difference linear voltage regulator |
| US20180095489A1 (en) * | 2016-09-30 | 2018-04-05 | Kilopass Technology, Inc. | Circuit for Low-Dropout Regulator Output |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210216092A1 (en) * | 2020-01-09 | 2021-07-15 | Mediatek Inc. | Reconfigurable series-shunt ldo |
| US11526186B2 (en) * | 2020-01-09 | 2022-12-13 | Mediatek Inc. | Reconfigurable series-shunt LDO |
| WO2023226969A1 (en) * | 2022-05-24 | 2023-11-30 | 芯海科技（深圳）股份有限公司 | Current stabilizing circuit and current stabilizing method therefor, integrated circuit, and electronic device |
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