Linear voltage regulator, chip and electronic device

Abstract

The present application provides a linear voltage regulator, a chip and an electronic device, wherein the linear voltage regulator comprises: a charge pump, a first end of which is connected to a power supply voltage, and a second end of which is connected to a filter circuit; a filter circuit, a second end of which is connected to a power output circuit; a power output circuit, a first end of which is connected to a power supply voltage, and a second end of which is respectively connected to an amplifier, a linear voltage regulator and a voltage feedback circuit, and a control end of which is also respectively connected to a compensation circuit and a pull-down circuit; an amplifier, an output end of which is connected to a pull-down circuit and a compensation circuit, and a reverse input end of which is connected to a voltage feedback circuit; when the voltage connected to the output end A2 of the linear voltage regulator by the amplifier is greater than a preset threshold value, the pull-down circuit is turned on; when the voltage connected to the output end A2 of the linear voltage regulator by the amplifier is less than or equal to a preset threshold value, the pull-down circuit is turned off. When the linear voltage regulator outputs a voltage, the ripple suppression ratio performance of the output voltage is high, the output voltage is a stable linear output, and the power consumption of the linear voltage regulator is small.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a linear regulator, a chip and an electronic device. Background Art

[0002] The linear regulator can be a low power voltage source. When outputting the chip power supply voltage based on the existing linear regulator, a linear regulator including a charge pump or a linear regulator based on the common source output voltage of the power tube in the linear regulator can be used.

[0003] The output voltage of the linear regulator based on the common source output voltage of the power tube has a low power ripple rejection ratio performance. If the power ripple rejection ratio performance of the voltage required by the electronic device electrically connected to the output end of the linear regulator is higher, an off-chip capacitor needs to be added to the linear regulator, and an input / output port needs to be added, and the chip package needs to add a metal wire, which increases the cost.

[0004] When the output voltage is based on a linear regulator including a charge pump, the upper and lower limit voltage monitoring points of the output voltage of the linear regulator are detected based on two comparators in the linear regulator, so that the output voltage of the linear regulator is constrained within the range of the upper and lower limits of the output voltage. However, when the power supply ripple suppression ratio performance of the voltage required by the electronic device electrically connected to the output end of the linear regulator is high, the output voltage connected by the linear regulator will have periodic ripples, which cannot meet the voltage requirements of the electronic device.

[0005] In addition, when a linear regulator including a charge pump provides voltage to a downstream device, the output voltage is connected to the drain of the power tube in the linear regulator. If the magnitude of the output voltage connected to the drain of the power tube in the linear regulator is the same as the magnitude of the voltage required by the downstream circuit device, the gate of the power tube in the linear regulator requires a higher voltage, but if the magnitude of the gate voltage of the power tube is 110% of the magnitude of the drain voltage of the power tube, the power tube will be damaged. Therefore, in this case, the linear regulator including a charge pump cannot be used to provide voltage to the downstream device. Summary of the invention

[0006] The present application provides a linear regulator, a chip and an electronic device to solve the problems that the output voltage of the linear regulator may have periodic ripples, the power tube in the linear regulator may be damaged, and the linear regulator and the chip have high costs.

[0007] In a first aspect, the present application provides a linear voltage regulator, the linear voltage regulator comprising: an amplifier, a charge pump, a filter circuit, a pull-down circuit, a power output circuit, a compensation circuit, and a voltage feedback circuit;

[0008] The first end of the charge pump is used to access the power supply voltage, and the second end is electrically connected to the first end of the filter circuit; the second end of the filter circuit is electrically connected to the control end of the power output circuit, and the third end is grounded; the first end of the power output circuit is used to access the power supply voltage, and the second end is electrically connected to the first end of the amplifier, the output end of the linear regulator and the first end of the voltage feedback circuit respectively, and the control end is also electrically connected to the first end of the compensation circuit and the first end of the pull-down circuit respectively; the output end of the linear regulator is used to connect the output voltage; the positive input end of the amplifier is used to access the reference voltage, the reverse input end is used to access the feedback voltage, and the output end is electrically connected to the control end of the pull-down circuit and the second end of the compensation circuit; the second end of the pull-down circuit is grounded; the second end of the voltage feedback circuit is grounded, and the third end of the voltage feedback circuit is used to output the feedback voltage;

[0009] an amplifier for providing voltage to a power output circuit;

[0010] The resistance of the pull-down circuit varies based on the output voltage connected to the output terminal of the linear regulator.

[0011] The first aspect of the present application provides a linear regulator, in which a voltage is provided to a power output circuit based on a charge pump and an amplifier. The charge pump is only used to provide voltage to the power output circuit, so the driving capability of the charge pump can be set to be relatively low, so that the power consumption of the charge pump is relatively low. And the charge pump provides voltage to the power output circuit based on a filter circuit, so that the power supply ripple suppression ratio performance of the voltage provided by the filter circuit is relatively high.

[0012] When the amplifier provides voltage to the power output circuit, the amplifier and the voltage feedback circuit form a feedback loop, so that the voltage provided by the amplifier to the power output circuit is a stable linear output. Furthermore, supplying power to the power output circuit based on the amplifier and the charge pump can enable the linear regulator to output a larger output voltage with low power consumption.

[0013] In addition, the pull-down circuit is electrically connected to the power output circuit and the amplifier, and can change the resistance of the pull-down voltage so that the output end of the linear regulator can stabilize the output voltage.

[0014] In one possible design, the pull-down circuit includes: a first transistor and a first resistor;

[0015] The first end of the first transistor is electrically connected to the control end of the power output circuit, the second end is electrically connected to the first end of the first resistor, and the control end is electrically connected to the output end of the amplifier;

[0016] A second terminal of the first resistor is grounded.

[0017] In a possible design, the resistance of the first transistor is negatively correlated with the output voltage connected to the output terminal of the linear regulator.

[0018] In one possible design, the power output circuit includes: a second transistor;

[0019] The first end of the second transistor is connected to the power supply voltage, the second end is electrically connected to the first end of the amplifier, the output end of the linear regulator and the first end of the voltage feedback circuit, and the control end is also electrically connected to the first end of the compensation circuit and the first end of the first transistor.

[0020] In one possible design, the filter circuit includes: a second resistor and a first capacitor;

[0021] The first end of the second resistor is electrically connected to the second end of the charge pump, and the second end is electrically connected to the first end of the first capacitor; the second end of the first capacitor is grounded; and the second end of the second resistor is also electrically connected to the control end of the second transistor.

[0022] In one possible design, the compensation circuit includes: a second capacitor;

[0023] The first end of the second capacitor is electrically connected to the control end of the second transistor, and the second end of the second capacitor is electrically connected to the output end of the amplifier.

[0024] In one possible design, the voltage feedback circuit includes: a third resistor and a fourth resistor;

[0025] The first end of the third resistor is electrically connected to the second end of the second transistor, and the second end of the third resistor is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is grounded.

[0026] In a second aspect, the present application provides a chip comprising a linear regulator in any possible design as described above.

[0027] In a third aspect, the present application provides an electronic device comprising the above-mentioned chip.

[0028] For the chip provided in the second aspect and each possible design of the second aspect, its beneficial effects can be referred to the beneficial effects brought about by the first aspect and each possible implementation method of the first aspect, and will not be described in detail here; for the electronic device provided in the third aspect and each possible design of the third aspect, its beneficial effects can be referred to the beneficial effects brought about by the first aspect, the second aspect, each possible implementation method of the first aspect and each possible implementation method of the second aspect, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a linear regulator provided in this application;

[0030] Figure 2 A circuit diagram of another linear regulator provided by the present application;

[0031] Figure 3 The output voltage curve diagram of the linear voltage regulator provided by the present application and another linear voltage regulator not provided by the present application when they are working. DETAILED DESCRIPTION

[0032] In this application, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c alone can mean: a alone, b alone, c alone, a and b in combination, a and c in combination, b and c in combination, or a, b, and c in combination, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0034] The terms "connected" and "connected" should be understood in a broad sense. For example, the "connected" or "connected" of a circuit structure can refer to not only physical connection, but also electrical connection or signal connection. For example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, or it can be the internal connection of two elements; signal connection can refer to signal connection through a circuit or through a media medium, such as radio waves. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] refer to Figure 1 , Figure 1A schematic diagram of the structure of a linear voltage regulator provided by the present application. In a first aspect, the present application provides a linear voltage regulator, which includes: an amplifier 1, a charge pump 2, a filter circuit, a pull-down circuit, a power output circuit, a compensation circuit, and a voltage feedback circuit.

[0036] The first end of the charge pump 2 is used to access the power supply voltage, and the second end is electrically connected to the first end of the filter circuit; the second end of the filter circuit is electrically connected to the control end of the power output circuit, and the third end is grounded; the first end of the power output circuit is used to access the power supply voltage, and the second end is electrically connected to the first end of the amplifier 1, the output end A2 of the linear regulator and the first end of the voltage feedback circuit, respectively, and the control end is also electrically connected to the first end of the compensation circuit and the first end of the pull-down circuit, respectively; the output end A2 of the linear regulator is used to output the output voltage; the positive input end of the amplifier 1 is used to access the reference voltage, the reverse input end is used to access the feedback voltage, and the output end is electrically connected to the control end of the pull-down circuit and the second end of the compensation circuit; the second end of the pull-down circuit is grounded; the second end of the voltage feedback circuit is grounded, and the third end of the voltage feedback circuit is used to output the feedback voltage.

[0037] Amplifier 1 is used to provide voltage to the power output circuit.

[0038] The resistance of the pull-down circuit varies based on the output voltage connected to the output terminal A2 of the linear regulator.

[0039] The linear regulator provided in the first aspect of the present application is a linear regulator without an off-chip capacitor. In the linear regulator, a charge pump 2 and an amplifier 1 are provided at the same time, and a voltage is provided to a power output circuit based on the charge pump 2 and the amplifier 1. The charge pump 2 is only used to provide a voltage to the power output circuit, so the driving capability of the charge pump 2 can be set to be relatively low, so that the power consumption of the charge pump 2 is relatively small.

[0040] The charge pump 2 provides a voltage to the power output circuit based on the filter circuit, so that the power supply ripple suppression ratio performance of the voltage provided by the filter circuit is higher. When the amplifier 1 provides a voltage to the power output circuit, the amplifier 1 forms a feedback loop with the voltage feedback circuit, so that the voltage provided by the amplifier 1 to the power output circuit is a stable linear output.

[0041] Furthermore, the linear regulator can output a larger output voltage at low power consumption by supplying power to the power output circuit based on the amplifier 1 and the charge pump 2. In addition, the pull-down circuit is electrically connected to the power output circuit and the amplifier 1, and the output voltage of the output terminal A2 of the linear regulator can be stabilized by changing the resistance of the pull-down voltage.

[0042] The linear regulator provided in the first aspect of the present application includes: an input terminal A1, an output terminal A2 and a feedback terminal A3. One end of the input terminal A1 of the linear regulator is electrically connected to the power supply device, and the other end is electrically connected to the charge pump 2 and the power output circuit in the linear regulator. One end of the output terminal A2 of the linear regulator is electrically connected to the power output circuit, the amplifier 1 and the voltage feedback circuit, respectively, and the other end is electrically connected to the subsequent electronic device. The feedback terminal A3 of the linear regulator is the third end of the voltage feedback circuit.

[0043] In the linear regulator, the amplifier 1, the charge pump 2, the filter circuit, the pull-down circuit, the power output circuit, the compensation circuit and the voltage feedback circuit are all in a constant on state.

[0044] In the linear regulator, the charge pump 2 and the amplifier 1 are both used to supply power to the control end of the power output circuit. The amplifier 1 is connected to the power supply voltage based on the power output circuit. The charge pump 2 is connected to the power output circuit based on the filter circuit. The filter circuit filters the voltage output by the charge pump 2 and then connects it to the power output circuit.

[0045] The amplifier 1 is connected to the power output circuit based on the compensation circuit. The compensation circuit is used to perform phase compensation on the amplifier 1 so that the feedback loop formed based on the amplifier 1 and the voltage feedback circuit can achieve sufficient loop relative margin.

[0046] In addition, the amplifier 1 is also connected to the power output circuit based on the pull-down circuit. The reverse input terminal of the amplifier 1 is electrically connected to the third terminal of the voltage feedback circuit. In the linear regulator, the pull-down circuit is used to change the voltage of the control terminal of the power output voltage to ensure the stability of the voltage output from the linear voltage regulator output terminal.

[0047] The reverse input terminal of amplifier 1 feeds back the output voltage of the linear regulator to amplifier 1 based on the voltage feedback circuit. Amplifier 1 can adjust the resistance in the pull-down circuit based on the output voltage, so that the resistance of the pull-down circuit changes with the output voltage connected to the output terminal of the linear regulator.

[0048] Among them, the reference voltage connected to the positive input terminal of the amplifier 1 in the linear regulator of the present application is a preset target voltage, which is used as the reference voltage value of the feedback voltage input to the positive input terminal of the amplifier 1. The size of the target voltage can be set based on specific needs, and the target voltage is the voltage required by the subsequent electronic device electrically connected to the output terminal A2 of the linear regulator. The first terminal of the amplifier 1 is used to connect the voltage connected to the output terminal A2 of the linear regulator.

[0049] In the amplifier 1, the working state of the amplifier 1 can be determined based on the size of the target voltage, that is, whether the amplifier 1 changes the size of the resistance of the pull-down circuit, so as to ensure the reliability and stability of the operation of the amplifier 1. The amplifier 1 can be an error amplifier or an operational amplifier.

[0050] The amplifier 1 and the charge pump 2 may be various amplifiers 1 suitable for a linear regulator without an off-chip capacitor, and the model of the amplifier 1 may be determined based on specific requirements.

[0051] In addition, the devices and circuit structures in the linear regulator of the present application include but are not limited to: amplifier 1, charge pump 2, filter circuit, pull-down circuit, power output circuit, compensation circuit and voltage feedback circuit, and devices and circuit structures can be increased based on specific needs.

[0052] refer to Figure 2 , Figure 2 A circuit diagram of another linear regulator provided by the present application. In a possible design, the pull-down circuit includes: a first transistor Q1 and a first resistor R1.

[0053] The first transistor Q1 has a first end electrically connected to the control end of the power output circuit, a second end electrically connected to the first end of the first resistor R1, and a control end electrically connected to the output end of the amplifier 1;

[0054] A second end of the first resistor R1 is grounded.

[0055] The first end of the first transistor Q1 is the drain of the first transistor Q1. The second end of the first transistor Q1 is the source of the second transistor Q2. The control end of the first transistor Q1 is the gate of the first transistor Q1. The first end of the first resistor R1 is the positive end of the first resistor R1. The second end of the first resistor R1 is the negative end of the first resistor R1.

[0056] In this possible design, the first transistor Q1 is in a constant on state, and the resistance of the first transistor Q1 changes with the change of the output voltage connected to the output terminal A2 of the linear regulator. The amplifier 1 provides a voltage to the first transistor Q1 based on the gate of the first transistor Q1. The source of the first transistor Q1 is grounded based on the first resistor R1.

[0057] In this possible design, the first resistor R1 in the pull-down circuit is the source negative feedback resistor of the first transistor Q1. The first transistor Q1 is used to weaken the transconductance of the first transistor Q1. Based on the joint action of the first transistor Q1, the first resistor R1 and the compensation circuit, the loop relative margin of the feedback loop formed by the amplifier 1 and the voltage feedback circuit is increased.

[0058] In this possible design, during the operation of the linear regulator, the magnitude of the output voltage of the linear regulator is fed back to the amplifier 1 based on the voltage feedback circuit. The amplifier 1 determines whether to adjust the magnitude of the resistance of the first transistor Q1 based on the magnitude of the output voltage fed back by the voltage feedback circuit and the magnitude of the target voltage so that the output terminal A2 of the linear regulator stably outputs the target voltage.

[0059] In addition, when the output voltage connected to the output terminal of the linear voltage regulator is greater than the target voltage, the amplifier 1 adjusts the resistance of the first transistor Q1, and the first transistor Q1 is in the on state, thereby changing the voltage of the control terminal of the power output circuit.

[0060] When the output voltage connected to the output terminal A2 of the linear regulator is smaller than the target voltage, the resistance of the first transistor Q1 gradually increases. At this time, the pull-down circuit has little effect on the power output circuit and can be almost ignored. At this time, the output voltage of the charge pump 2 increases, so that the power output circuit outputs the target voltage. If the voltage connected to the output terminal A2 of the linear regulator is the same as the target voltage, the amplifier 1 and the charge pump 2 do not perform the above operation.

[0061] In a possible design of the present application, the resistance of the first transistor Q1 is negatively correlated with the output voltage connected to the output terminal A2 of the linear regulator.

[0062] In a possible design of the present application, the larger the voltage connected to the output terminal A2 of the linear regulator, the smaller the resistance of the first transistor Q1, so that the current output by the first transistor Q1 increases, thereby lowering the voltage of the control terminal of the power output tube, thereby reducing the output voltage connected to the output terminal A2 of the linear regulator.

[0063] In the linear regulator, the smaller the voltage received at the output terminal A2 of the linear regulator, the larger the resistance of the first transistor Q1 is, and the smaller the current output by the first transistor Q1 is.

[0064] refer to Figure 2 In a possible design of the present application, the power output circuit includes: a second transistor Q2.

[0065] The first end of the second transistor Q2 is connected to the power supply voltage, the second end is electrically connected to the first end of the amplifier 1, the output end A2 of the linear regulator and the first end of the voltage feedback circuit, and the control end is also electrically connected to the first end of the compensation circuit and the first end of the first transistor Q1.

[0066] exist Figure 2In the linear regulator shown, the first end of the second transistor Q2 is the drain of the second transistor Q2, the second end of the second transistor Q2 is the source of the second transistor Q2, and the control end of the second transistor Q2 is the gate of the second transistor Q2.

[0067] exist Figure 2 In the linear regulator shown, the second transistor Q2 is a power output tube. The drain and gate of the second transistor Q2 are both input terminals, and the source is used as an output terminal. The source of the second transistor Q2 is electrically connected to the output terminal A2 of the linear regulator. The gate of the second transistor Q2 is electrically connected to the drain of the first transistor Q1. When the output voltage connected to the output terminal A2 of the linear regulator is the feedback voltage connected to the amplifier 1.

[0068] When the linear regulator is working, the voltage feedback circuit feeds back the voltage outputted by the output terminal A2 of the linear regulator to the amplifier 1, and the amplifier 1 makes a judgment based on the connected target voltage and the feedback voltage. If the target voltage is greater than the feedback voltage, the amplifier 1 adjusts the resistance of the first transistor Q1 to be larger. If the target voltage is less than the feedback voltage, the amplifier 1 adjusts the resistance of the first transistor Q1 to be smaller.

[0069] refer to Figure 2 In one possible design, the filtering circuit includes: a second resistor R2 and a first capacitor C1.

[0070] The first end of the second resistor R2 is electrically connected to the second end of the charge pump 2, and the second end is electrically connected to the first end of the first capacitor C1; the second end of the first capacitor C1 is grounded; the second end of the second resistor R2 is also electrically connected to the control end of the second transistor Q2.

[0071] exist Figure 2 In the linear regulator shown, the first end of the second resistor R2 is the positive terminal of the second resistor R2. The second end of the second resistor R2 is the negative terminal of the second resistor. The first end of the first capacitor C1 is the positive terminal of the first capacitor C1. The second end of the first capacitor C1 is the negative terminal of the first capacitor C1.

[0072] refer to Figure 2 In one possible design, the compensation circuit includes: a second capacitor C2.

[0073] A first end of the second capacitor C2 is electrically connected to the control end of the second transistor Q2 , and a second end of the second capacitor C2 is electrically connected to the output end of the amplifier 1 .

[0074] exist Figure 2 In the linear regulator shown, the first end of the second capacitor C2 is the positive terminal of the second capacitor C2. The second end of the second capacitor C2 is the negative terminal of the second capacitor C2. The second capacitor C2 is electrically connected to the output end of the amplifier 1. The second capacitor C2 is used to compensate for the phase shift of the amplifier 1.

[0075] When the amplifier 1 is working, it has a corresponding phase shift effect on a signal of a certain frequency. Such a signal fed back to the input end will make the amplifier circuit unstable or even oscillate. Therefore, a second capacitor C2 is set between the amplifier 1 and the gate of the second transistor Q2 to perform phase compensation on the amplifier 1.

[0076] refer to Figure 2 , in one possible design, the voltage feedback circuit includes: a third resistor R3 and a fourth resistor R4;

[0077] The first end of the third resistor R3 is electrically connected to the second end of the second transistor Q2, and the second end of the third resistor R3 is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is grounded.

[0078] exist Figure 2 In the linear regulator shown, the first end of the third resistor R3 is the positive terminal of the third resistor R3. The second end of the third resistor R3 is the negative terminal of the third resistor R3. The first end of the fourth resistor R4 is the positive terminal of the fourth resistor R4. The second end of the fourth resistor R4 is the negative terminal of the fourth resistor R4.

[0079] exist Figure 2 In the linear regulator shown, the third terminal of the voltage feedback circuit is arranged between the second terminal of the third resistor and the first terminal of the fourth resistor.

[0080] refer to Figure 3 , Figure 3 The output voltage curve diagram of the linear voltage regulator provided by the present application and another linear voltage regulator not provided by the present application when they are working.

[0081] exist Figure 3 In the figure, curve U1 is an output voltage curve of another linear regulator without an external capacitor other than the present application when it is working; curve U2 is an output voltage curve of the linear regulator provided by the present application when it is working.

[0082] like Figure 3 As shown, the charge pump 2, amplifier 1, filter circuit, pull-down circuit, power output circuit, compensation circuit and voltage feedback circuit of the present application form an output voltage circuit. Among them, the operating parameters of another linear regulator without external capacitors other than the present application are the same as the operating parameters of the linear regulator provided by the present application.

[0083] like Figure 3As shown, when the linear regulator outputs stably, the output voltage of another linear regulator without an external capacitor not provided by the present application has periodic ripples and is not a stable output target voltage. That is, the power ripple suppression of another linear regulator without an external capacitor not provided by the present application is relatively low, and the output voltage fluctuates around the target voltage, which easily affects the working state of the subsequent electronic equipment.

[0084] When the linear voltage regulator of the present application outputs stably, the target voltage is output stably and the output voltage does not change. That is, the power ripple suppression of the linear voltage regulator of the present application is relatively high and can effectively stabilize the output.

[0085] like Figure 3 As shown, the structures of the filter circuit, pull-down circuit, power output circuit, compensation circuit and voltage feedback circuit in the present application include but are not limited to the above structures, and the specific structural settings only need to meet the above functional requirements.

[0086] In a second aspect, the present application provides a chip comprising a linear regulator in any possible design as described above.

[0087] In a third aspect, the present application provides an electronic device comprising the above-mentioned chip.

[0088] For the chip provided in the second aspect and each possible design of the second aspect, its beneficial effects can be referred to the beneficial effects brought about by the first aspect and each possible implementation method of the first aspect, and will not be described in detail here; for the electronic device provided in the third aspect and each possible design of the third aspect, its beneficial effects can be referred to the beneficial effects brought about by the first aspect, the second aspect, each possible implementation method of the first aspect and each possible implementation method of the second aspect, and will not be described in detail here.

Claims

1. A linear regulator, characterized in that: The linear voltage regulator comprises: an amplifier, a charge pump, a filter circuit, a pull-down circuit, a power output circuit, a compensation circuit and a voltage feedback circuit; The first end of the charge pump is used to access the power supply voltage, and the second end is electrically connected to the first end of the filter circuit; the second end of the filter circuit is electrically connected to the control end of the power output circuit, and the third end is grounded; the first end of the power output circuit is used to access the power supply voltage, and the second end is electrically connected to the first end of the amplifier, the output end of the linear regulator and the first end of the voltage feedback circuit respectively, and the control end is also electrically connected to the first end of the compensation circuit and the first end of the pull-down circuit respectively; the output end of the linear regulator is used to output the output voltage; the positive input end of the amplifier is used to access the reference voltage, the reverse input end is used to access the feedback voltage, and the output end is electrically connected to the control end of the pull-down circuit and the second end of the compensation circuit; the second end of the pull-down circuit is grounded; the second end of the voltage feedback circuit is grounded, and the third end of the voltage feedback circuit is used to output the feedback voltage; The amplifier is used to provide voltage to the power output circuit; The resistance of the pull-down circuit varies based on the output voltage connected to the output terminal of the linear regulator; Wherein, the pull-down circuit comprises: a first transistor and a first resistor; The first end of the first transistor is electrically connected to the control end of the power output circuit, the second end is electrically connected to the first end of the first resistor, and the control end is electrically connected to the output end of the amplifier; the second end of the first resistor is grounded; The resistance of the first transistor is negatively correlated with the output voltage output from the output terminal of the linear regulator.

2. The linear regulator according to claim 1, characterized in that: The power output circuit comprises: a second transistor; The first end of the second transistor is connected to the power supply voltage, the second end is electrically connected to the first end of the amplifier, the output end of the linear regulator and the first end of the voltage feedback circuit respectively, and the control end is also electrically connected to the first end of the compensation circuit and the first end of the first transistor respectively.

3. The linear regulator according to claim 2, characterized in that: The filter circuit comprises: a second resistor and a first capacitor; The first end of the second resistor is electrically connected to the second end of the charge pump, and the second end is electrically connected to the first end of the first capacitor; the second end of the first capacitor is grounded; and the second end of the second resistor is also electrically connected to the control end of the second transistor.

4. The linear regulator according to claim 3, characterized in that: The compensation circuit includes: a second capacitor; A first end of the second capacitor is electrically connected to the control end of the second transistor, and a second end of the second capacitor is electrically connected to the output end of the amplifier.

5. The linear regulator according to claim 4, characterized in that: The voltage feedback circuit comprises: a third resistor and a fourth resistor; The first end of the third resistor is electrically connected to the second end of the second transistor, and the second end of the third resistor is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is grounded.

6. A chip, characterized in that: The invention comprises a linear regulator as claimed in any one of claims 1 to 5.

7. An electronic device, characterized in that: Comprising the chip as claimed in claim 6.

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