Linear voltage regulator and loop weight adjusting method thereof

Abstract

The invention relates to the technical field of integrated circuits and power supplies, in particular to a linear voltage stabilizer and a loop weight adjusting method thereof, and the voltage stabilizer comprises an error amplifier, a feedback module, a current sharing control circuit and a voltage adjusting module; the input end of the error amplifier is electrically connected with the feedback module, the reference voltage source and the current sharing control circuit. The output end of the error amplifier is connected with the input end of the voltage regulation module, and the error amplifier is used for configuring the weights of the voltage-stabilizing loop and the current-sharing loop according to the input signal; the output end of the voltage regulation module is connected to the error amplifier through the feedback module; the current-sharing control circuit is arranged in the voltage regulation module in parallel and used for generating a current-sharing voltage signal, the current-sharing voltage signal and a feedback voltage signal generated by the feedback module jointly regulate the error amplifier, weight configuration of a voltage-stabilizing loop and a current-sharing loop is achieved, and the voltage stabilizer is simple in structure and high in universality.

Description

Technical Field

[0001] The invention relates to the technical field of integrated circuits and power supplies, and in particular to a linear voltage regulator and a loop weight adjustment method thereof. Background Art

[0002] Voltage regulator is an important branch of power management chip, which can provide stable output voltage for the system. Among them, low-dropout voltage regulator (Low-Dropout Voltage Regulator, LDO) has simple structure, low power consumption, fast load response speed, strong power supply ripple suppression (Power Supply Rejection, PSR) and easy integration, and has become the main power supply for micro devices.

[0003] Different application scenarios have different performance requirements for LDOs. For characteristics such as wide load, fast response, and high power supply rejection ratio, traditional LDOs with only one feedback voltage control loop can no longer meet application requirements, and multiple control loops are required to achieve multiple performance requirements.

[0004] To meet the demand for high transient performance, LDO needs to add a transient enhancement loop to achieve fast charging and discharging of the parasitic capacitance of the power tube gate; to meet the demand for high power supply rejection ratio, LDO needs to add a PSR boost loop to suppress the ripple of the input voltage and improve the quality of the LDO output voltage; to meet the current sharing demand of LDO parallel power supply, it is necessary to add a current sharing control loop to control the output current of each LDO. As the demand for LDO performance continues to increase, there are multiple loops in an LDO, which affect each other and have a control competition relationship.

[0005] At present, there is little research on the loop weight of LDO. Most multi-loop structures have a small gain in the auxiliary loop to ensure the improvement of auxiliary performance without affecting the operation of the main loop. This circuit cannot directly adjust the weight, but can only change the multi-loop structure to change the weight of different loops to achieve current sharing.

[0006] Although the traditional current balancing method can alleviate the current balancing problem to a certain extent, it also has many disadvantages. For example, the current balancing performance is overly dependent on the matching degree of external components, which is difficult to accurately guarantee in practical applications; the introduction of the current balancing circuit often has a negative impact on the performance of the LDO itself, such as reducing the power supply ripple rejection ratio or increasing power consumption; traditional current balancing circuits mostly use centralized control methods, which limits the scalability of the LDO system and makes it difficult to meet the needs of large-scale parallel connection; in addition, the complex current balancing wiring, poor current balancing accuracy, and large area that is not conducive to integration also restrict the application of traditional current balancing methods in modern high-performance electronic devices.

[0007] In summary, in the field of voltage regulators, especially LDO technology, there is an urgent need to develop a new voltage regulator technology solution that can effectively solve the problem of multi-loop weight adjustment, improve the parallel current sharing performance and overcome the many defects of traditional methods, so as to meet the growing high performance, high reliability and high integration requirements of electronic products for power management. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a linear regulator and a loop weight adjustment method thereof in view of the deficiencies in the above-mentioned prior art, so as to solve the technical problems that the LDO loop weight cannot be adjusted and the current sharing performance is poor.

[0009] The objective of the present invention is achieved by the following technical solutions: In a first aspect, the present invention provides a method for adjusting a loop weight of a linear regulator, comprising: Obtain a reference voltage signal, obtain a current-sharing voltage signal through a current-sharing control circuit; obtain a feedback voltage signal through a voltage regulation module; The current-sharing voltage signal, the feedback voltage signal and the reference voltage signal are input into the error amplifier for adjustment, so as to realize the weight configuration between the voltage regulation loop and the current-sharing loop of the linear regulator.

[0010] As a further improvement of the present invention, the current-sharing voltage signal, the feedback voltage signal and the reference voltage signal are input into the error amplifier for adjustment, specifically including: The input transistor size of the error amplifier is changed to obtain the total control quantity related to each loop of the linear regulator, and the control weight of the voltage regulation loop and the control weight of the current sharing loop are configured based on the total control quantity, specifically including:

[0011]

[0012] In the formula, is the total control quantity, is the control weight of the voltage regulation loop, is the control weight of the current sharing loop, is the feedback voltage, is the current sharing control voltage.

[0013] As a further improvement of the present invention, the control weight of the voltage stabilization loop And the control weight of the current sharing loop They include:

[0014]

[0015]

[0016] In the formula, The size of the input transistor corresponding to the feedback voltage signal, The reference voltage signal corresponds to the size of the input transistor, is the size of the input transistor corresponding to the current-sharing voltage signal.

[0017] As a further improvement of the present invention, the control weight of the voltage stabilization loop and the control weight of the current sharing loop are configured based on the total control amount, specifically including: When the output voltage accuracy and transient performance of the linear regulator are lower than the set threshold, the size of the input transistor corresponding to the feedback voltage signal is increased, thereby increasing the control weight of the voltage regulation loop; when the current sharing accuracy between the linear regulators is lower than the set threshold, the size of the input transistor corresponding to the current sharing voltage signal is increased, thereby increasing the control weight of the current sharing loop.

[0018] In a second aspect, the present invention provides a linear regulator for implementing the above-mentioned linear regulator loop weight adjustment method, comprising an error amplifier, a feedback module, a current sharing control circuit and a voltage regulation module; The input end of the error amplifier is used to electrically connect the feedback module, the reference voltage source and the current sharing control circuit respectively; the output end is used to connect the input end of the voltage regulation module, and the error amplifier is used to configure the weights of the voltage stabilization loop and the current sharing loop according to the input signal; the output end of the voltage regulation module is used to be connected to the error amplifier through the feedback module; the current sharing control circuit is arranged in parallel with the voltage regulation module to generate a current sharing voltage signal, which is used to adjust the error amplifier together with the feedback voltage signal generated by the feedback module to realize the weight configuration of the voltage stabilization loop and the current sharing loop.

[0019] As a further improvement of the present invention, when there are multiple linear regulators, the multiple linear regulators are connected in parallel, and the current sharing control circuits between adjacent linear regulators are connected in series.

[0020] As a further improvement of the present invention, the current balancing control circuit includes a current sampling circuit and a transimpedance amplifier; The input end of the current sampling circuit is used to connect to the output end of the voltage regulation module to generate a sampling current of the first adjacent linear regulator, the first output end is used to connect to the current sharing control circuit of the second adjacent linear regulator, and the second output end is used to connect to the transimpedance amplifier of the first adjacent linear regulator; the current sampling circuit is used to sample the output current of the linear regulator, and the sampled currents of the first adjacent linear regulator and the second adjacent linear regulator are used as inputs of the transimpedance amplifier to amplify the current error between the linear regulators; The transimpedance amplifier includes a first input terminal and a second input terminal, the first input terminal is used to connect to the output terminal of the current sampling circuit of the first adjacent linear regulator; the second input terminal is used to connect to the output terminal of the current sampling circuit of the second adjacent linear regulator; the output terminal is used to connect to the error amplifier, the transimpedance amplifier is used to obtain the output voltage of the current sharing control, and the output voltage of the current sharing control is used to adjust the error amplifier.

[0021] As a further improvement of the present invention, the error amplifier adopts a three-input amplifier, which includes a first input terminal, a second input terminal and a third input terminal, the first input terminal is used to obtain a reference voltage signal, the second input terminal is used to obtain a feedback voltage signal, and the third input terminal is used to obtain a current sharing voltage signal; the input port of the three-input amplifier includes a plurality of parallel input transistors; the weight configuration of the voltage stabilization loop and the current sharing loop is adjusted according to the size of the input transistor.

[0022] As a further improvement of the present invention, the voltage regulation module includes a voltage buffer and a power tube, the input end of the voltage buffer is used to connect to the error amplifier, and the output end is used to connect to the gate of the power tube; the source of the power tube is used to connect to the power supply; and the drain is used to generate an output voltage.

[0023] As a further improvement of the present invention, the linear regulator further includes a first compensation module and a second compensation module, wherein the first compensation module is arranged in parallel on both sides of the voltage regulation module; and the second compensation module is arranged in parallel on both sides of the transimpedance amplifier.

[0024] The beneficial effects of the present invention are as follows: the linear voltage regulator of the present invention can not only adjust the output voltage through the error amplifier according to the feedback voltage signal, control the output of the voltage regulation module, and realize the voltage stabilization function. It can also adjust the output current through the error amplifier according to the current sharing voltage signal to control the current balance between adjacent LDOs. The error amplifier realizes the weight adjustment of the voltage stabilization loop and the current sharing loop by configuring the weight of the input signal. The feedback voltage and the reference voltage are accurately compared and adjusted by the error amplifier to realize high-precision output voltage control. The current sharing control circuit is integrated inside the LDO, and no external components and centralized control circuits are required. It can be arbitrarily expanded according to the load size, suitable for powering high-power loads, and no external current sharing control circuit and component matching are required, which simplifies the circuit design and reduces the system complexity and cost.

[0025] Furthermore, the loop weight configuration scheme proposed by the present invention has a simple structure and strong versatility, and can realize the weight configuration of multiple loops without additional circuit design and power consumption. The weight is related to the input tube size, so the weight configuration of the loop can be realized by simply changing the input tube size. According to the needs of different scenarios, the weight of each loop is configured to achieve the required performance.

[0026] Furthermore, the current error is accurately amplified and converted by the transimpedance amplifier to achieve high-precision current balancing control. By adjusting the gain of the transimpedance amplifier, the response speed and accuracy of the current balancing control loop can be flexibly adjusted. The circuit has a simple structure and a small chip area, and is suitable for high-integration applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 Schematic diagram of a LDO weight configuration scheme for k loops in an embodiment of the present invention.

[0029] Figure 2 1 is a block diagram of the overall structure of the LDO in an embodiment of the present invention.

[0030] Figure 3 Schematic diagram of a three-input amplifier in an embodiment of the present invention.

[0031] Figure 4 This is a current-sharing circuit of four LDOs connected in parallel in an embodiment of the present invention.

[0032] Figure 5 This is a waveform diagram showing that when a load suddenly changes at a certain location in an embodiment of the present invention, the ratio of the voltage stabilization loop weight to the current sharing loop weight is 3:1.

[0033] Figure 6 It is a waveform diagram showing that when a load suddenly changes at a certain location in an embodiment of the present invention, the ratio of the voltage stabilization loop weight to the current sharing loop weight is 1:1.

[0034] Figure 7 It is a waveform diagram showing that when a load suddenly changes at a certain location in an embodiment of the present invention, the ratio of the voltage stabilization loop weight to the current sharing loop weight is 1:3. DETAILED DESCRIPTION

[0035] In order to make the purpose and technical solution of the present invention clearer and easier to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] Terminology explanation: MP (Metal-Oxide-Semiconductor Field-Effect Transistor Positive): Positive input MOSFET.

[0037] MN (Metal-Oxide-Semiconductor Field-Effect Transistor Negative): Negative input MOSFET.

[0038] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, wherein the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0039] Example 1 like Figure 1-Figure 7 As shown, this embodiment provides a linear regulator. The current sharing control circuit is integrated inside each LDO chip to achieve modularization, and the above-mentioned loop weight configuration scheme is applied to realize the configuration of the current sharing weight. The current sharing control of the system is realized by a simple expansion of the current sharing control port without any centralized control and external matching. The linear regulator includes an error amplifier, a feedback module, a current sharing control circuit and a voltage regulation module.

[0040] The input end of the error amplifier EA is used to electrically connect the feedback module, the reference voltage source and the current sharing control circuit; the output end is used to connect the input end of the voltage regulation module, and the error amplifier is used to configure the weights of the voltage regulation loop and the current sharing loop according to the input signal.

[0041] The output terminal of the voltage regulation module is used to connect to the error amplifier through the feedback module.

[0042] The current sharing control circuit is arranged in parallel in the voltage regulation module to generate a current sharing voltage signal, which is used to adjust the error amplifier together with the feedback voltage signal generated by the feedback module to achieve the weight configuration of the voltage stabilization loop and the current sharing loop.

[0043] Specifically, the error amplifier uses a three-input amplifier, which includes a first input terminal, a second input terminal and a third input terminal, wherein the first input terminal is used to obtain a reference voltage signal VREF, the second input terminal is used to obtain a feedback voltage signal VFB, and the third input terminal is used to obtain a current-sharing voltage signal VCS. The input port of the three-input amplifier includes a plurality of parallel input transistors; the weight configuration of the voltage stabilization loop and the current-sharing loop is adjusted according to the size of the input transistor corresponding to each signal.

[0044] Specifically, when there are multiple loops in the LDO, the weight configuration of each loop can be changed through the multi-input error amplifier input tube. For example, when the LDO has other k-1 loops in addition to the feedback loop, the error amplifier can be changed to a k+1 input structure, such as Figure 1 As shown. The reference voltage input MOS tube MP remains unchanged, and the original input feedback voltage MOS tube MN transistor can be split into k equivalent transistors MN1~MNk, as shown Figure 1 The sum of their sizes is still equal to the size of MN.

[0045] The sizes of k transistors are , , This is equivalent to generating a new signal , … The amount of control .

[0046] The control quantity meets:

[0047] in, represents the control weight of loop i , including:

[0048] It should be noted that the size of each transistor must meet:

[0049] Otherwise, the loads on both sides of the amplifier will flow through different currents and enter the linear region, losing the ability to adjust. Therefore, each weight satisfies the following relationship:

[0050]

[0051] The loop control weight is configured by changing the sizes of the k input transistors of the error amplifier to meet application requirements in different scenarios.

[0052] like Figure 3 As shown, for the current-sharing LDO circuit of the two loops, unlike the two-input error amplifier of the traditional LDO, a three-input amplifier is used in this embodiment to realize the integration of voltage regulation control and current-sharing control: the MOS tube that originally inputs the feedback voltage is split into two parallel MOS tubes, which input the feedback voltage VFB and the output voltage VCS of the current-sharing control respectively, and the other MOS tube that inputs the reference voltage VREF remains unchanged. The sizes of the three transistors are , and This is equivalent to generating a new control quantity related to both the feedback voltage and the current sharing voltage, and also generates two control loops: a voltage regulation loop for adjusting the output voltage and a current sharing loop for adjusting the current sharing error.

[0053] Specifically include:

[0054] In the formula, is the total control quantity, is the control weight of the voltage regulation loop, is the control weight of the current sharing loop, is the feedback voltage, is the current sharing control voltage.

[0055] Among them, the control weight of the voltage regulation loop And the control weight of the current sharing loop Included

[0056]

[0057] In the formula, The size of the input transistor corresponding to the feedback voltage signal, The reference voltage signal corresponds to the size of the input transistor, For the size of the input transistor corresponding to the current-sharing voltage signal, it should be noted that the sizes of the three transistors must meet the following requirements:

[0058] Otherwise, the loads on both sides of the three-input amplifier will flow different currents and enter the linear region, losing the regulation ability. And the control weight of the current sharing loop satisfy:

[0059] By changing the size of the three input transistors of the error amplifier to configure the loop control weight, the voltage regulation loop and the current sharing loop are superimposed according to the weight. Through the high-gain loop, the output voltage error and the current sharing control error are adjusted to achieve the integration of the LDO voltage regulation and the current sharing regulation between adjacent LDOs. When the output accuracy and transient performance requirements of the LDO are high, the control weight of the voltage regulation loop can be increased; when the current sharing accuracy requirements between LDOs are high, the control weight of the current sharing loop can be increased.

[0060] The current balancing control circuit includes a current sampling circuit Current Sensing and a transimpedance amplifier TIA. The input end of the current sampling circuit is used to connect to the output end of the voltage regulation module, and the first output end IS1 is used to connect to the current balancing control circuit of the second adjacent linear regulator, specifically connected to the transimpedance amplifier of the second adjacent linear regulator; the second output end is used to connect to the transimpedance amplifier of the first adjacent linear regulator. The current sampling circuit is used to sample the output current of the linear regulator, and the sampled current of the first adjacent linear regulator and the current IM1 of the second adjacent linear regulator are used as the input of the transimpedance amplifier to amplify the current error between the linear regulators; The transimpedance amplifier includes a first input terminal and a second input terminal, wherein the first input terminal is used to connect to the output terminal of the current sampling circuit of the first adjacent linear regulator; the second input terminal is used to connect to the output terminal IM1 of the current sampling circuit of the second adjacent linear regulator; and the output terminal is used to connect to the error amplifier. The transimpedance amplifier is used to obtain the output voltage of the current sharing control, and the output voltage of the current sharing control is used to adjust the error amplifier. In order to adapt to a wide range of loads, a variable resistor is used at the input terminal of the transimpedance amplifier in this embodiment to match the input swing of the amplifier.

[0061] The voltage regulation module includes a voltage buffer Buf and a power tube. The input end of the voltage buffer is used to connect to the error amplifier, and the output end is used to connect to the gate of the power tube; the source of the power tube is used to connect to the power supply. In addition, the input end of the feedback module is connected to the drain of the power tube, and the output end is connected to the input end of the error amplifier; the drain is used to generate an output voltage. The current sampling circuit uses a current mirror to replicate the output current, and the input end is set on the line between the voltage buffer and the power tube.

[0062] The linear voltage regulator further comprises a first compensation module comp1 and a second compensation module comp2. The first compensation module is used to be arranged in parallel on both sides of the voltage regulating module; the second compensation module is used to be arranged in parallel on both sides of the transimpedance amplifier to stabilize the circuit frequency response.

[0063] When there are multiple linear regulators, multiple linear regulators are connected in parallel, and the current sharing control circuits between adjacent linear regulators are connected in series. In order to modularize the current sharing control, this embodiment changes the idea of ​​controlling the current sharing error of all parallel LDOs to controlling the current sharing error between adjacent LDOs, so that the current sharing control expansion of multiple LDOs can be achieved. Therefore, the current sharing control of each LDO designed has two ports, one is the sampling current port IM of the adjacent LDO, and the other is the detection current port IS of its own LDO. The current sharing control circuit amplifies the current error of the two adjacent LDOs through a transimpedance amplifier and generates a voltage signal. The current sharing voltage signal, the feedback voltage signal, and the reference voltage signal are adjusted together as the input of the three-input error amplifier. The voltage stabilization loop and the current sharing loop can adjust the output voltage of the LDO and the current error between adjacent LDOs by configuring the loop weight, so as to realize the fusion of voltage stabilization control and current sharing control.

[0064] The LDO chip designed in this embodiment integrates a current sharing control circuit. Multiple LDOs are connected into a chain structure through only two current sharing ports. The control circuit adjusts the current between every two adjacent LDOs to be equal. The current sharing characteristics of the entire LDO system are achieved through the chain connection. Figure 4 The designed current-sharing LDO can be arbitrarily expanded according to the load size, has high flexibility, and is very suitable for parallel on-chip power supply for high-power loads.

[0065] The loop weight adjustment technology proposed in the present invention is used for multi-loop LDO. The weight of each loop can be quantitatively designed according to the needs of different application scenarios to achieve different index requirements. According to the proposed loop weight adjustment method, a modular and scalable LDO current balancing circuit with adjustable current sharing weight is designed using a 0.18um standard CMOS process, and simulation verification is performed. The entire circuit operates under a power supply voltage of 1.8V. There are two loops: a voltage stabilization loop for adjusting the output voltage and a current sharing loop for adjusting the current sharing error. The output voltage is 1.5V-1.7V and the maximum load is 1.2A. Under extreme parasitic or unbalanced loads, the steady-state current sharing error is always less than 1.5%, achieving high-precision on-chip current sharing control.

[0066] In a power supply network with four LDOs connected in parallel, when a sudden load change occurs somewhere, the output current and voltage of each LDO are simulated. Figure 5 , Figure 6 and Figure 7 The weight ratios of the voltage regulation loop and the current sharing loop are From the simulation waveforms at 3:1, 1:1, and 1:3, it can be seen that as the weight of the current-sharing loop increases, the current of each LDO converges faster and the difference is smaller; as the weight of the voltage-stabilizing loop increases, the output voltage of each LDO stabilizes in a shorter time and has smaller fluctuations. There is a trade-off between the two performances, and different loop weights can be selected according to application requirements: as the weight of the current-sharing loop increases, the response of the current-sharing in the transient process becomes faster; as the weight of the voltage-stabilizing loop increases, the response of the output voltage in the transient process becomes faster.

[0067] Example 2 This embodiment provides a method for adjusting loop weight of a linear regulator according to the linear regulator described in Embodiment 1. The method mainly includes the following steps: Obtain a reference voltage signal, obtain a current-sharing voltage signal through a current-sharing control circuit; obtain a feedback voltage signal through a voltage regulation module; The current-sharing voltage signal, the feedback voltage signal and the reference voltage signal are input into the error amplifier for adjustment, so as to realize the weight configuration between the voltage regulation loop and the current-sharing loop of the linear regulator.

[0068] Specifically, this embodiment mainly adjusts the input transistor size of the error amplifier to achieve weight configuration. By changing the input transistor size of the error amplifier, the total control amount related to each loop of the linear regulator is obtained, and the control weight of the voltage regulation loop and the control weight of the current sharing loop are configured based on the total control amount, specifically including:

[0069]

[0070] In the formula, is the total control quantity, is the control weight of the voltage regulation loop, is the control weight of the current sharing loop, is the feedback voltage, is the current sharing control voltage.

[0071] Among them, the control weight of the voltage regulation loop And the control weight of the current sharing loop They include:

[0072]

[0073]

[0074] In the formula, The size of the input transistor corresponding to the feedback voltage signal, The reference voltage signal corresponds to the size of the input transistor, is the size of the input transistor corresponding to the current-sharing voltage signal.

[0075] By changing the size of the three input transistors of the error amplifier to configure the loop control weight, the voltage regulation loop and the current sharing loop are superimposed according to the weight. Through the high-gain loop, the output voltage error and the current sharing control error are adjusted to achieve the integration of the LDO voltage regulation and the current sharing regulation between adjacent LDOs. When the output voltage accuracy and transient performance of the linear regulator are lower than the set threshold, the size of the input transistor corresponding to the feedback voltage signal is increased, thereby increasing the control weight of the voltage regulation loop; when the current sharing accuracy between the linear regulators is lower than the set threshold, the size of the input transistor corresponding to the current sharing voltage signal is increased, thereby increasing the control weight of the current sharing loop.

Claims

1. A method for adjusting loop weight of a linear regulator, characterized in that: include: Obtain a reference voltage signal, and obtain a current-sharing voltage signal through a current-sharing control circuit; Acquire feedback voltage signal through voltage regulation module; The current-sharing voltage signal, the feedback voltage signal and the reference voltage signal are input into the error amplifier for adjustment, so as to realize the weight configuration between the voltage regulation loop and the current-sharing loop of the linear regulator.

2. The linear regulator loop weight adjustment method according to claim 1, characterized in that: The current sharing voltage signal, the feedback voltage signal and the reference voltage signal are input into the error amplifier for adjustment, specifically including: The input transistor size of the error amplifier is changed to obtain the total control quantity related to each loop of the linear regulator, and the control weight of the voltage regulation loop and the control weight of the current sharing loop are configured based on the total control quantity, specifically including: In the formula, is the total control quantity, is the control weight of the voltage regulation loop, is the control weight of the current sharing loop, is the feedback voltage, is the current sharing control voltage.

3. The linear regulator loop weight adjustment method according to claim 2, characterized in that: The control weight of the voltage regulation loop And the control weight of the current sharing loop They include: In the formula, The size of the input transistor corresponding to the feedback voltage signal, The reference voltage signal corresponds to the size of the input transistor, is the size of the input transistor corresponding to the current-sharing voltage signal.

4. The linear regulator loop weight adjustment method according to claim 2, characterized in that: Based on the total control amount, the control weight of the voltage regulation loop and the control weight of the current sharing loop are configured, including: When the output voltage accuracy and transient performance of the linear regulator are lower than the set threshold, the size of the input transistor corresponding to the feedback voltage signal is increased, thereby increasing the control weight of the voltage regulation loop; when the current sharing accuracy between the linear regulators is lower than the set threshold, the size of the input transistor corresponding to the current sharing voltage signal is increased, thereby increasing the control weight of the current sharing loop.

5. A linear regulator, used to implement the linear regulator loop weight adjustment method according to any one of claims 1 to 4, characterized in that: It includes an error amplifier, a feedback module, a current sharing control circuit and a voltage regulation module; The input end of the error amplifier is used to electrically connect the feedback module, the reference voltage source and the current sharing control circuit respectively; the output end is used to connect the input end of the voltage regulation module, and the error amplifier is used to configure the weights of the voltage stabilization loop and the current sharing loop according to the input signal; the output end of the voltage regulation module is used to be connected to the error amplifier through the feedback module; the current sharing control circuit is arranged in parallel with the voltage regulation module to generate a current sharing voltage signal, which is used to adjust the error amplifier together with the feedback voltage signal generated by the feedback module to realize the weight configuration of the voltage stabilization loop and the current sharing loop.

6. The linear regulator according to claim 5, characterized in that: When there are multiple linear regulators, the multiple linear regulators are connected in parallel, and the current sharing control circuits between adjacent linear regulators are connected in series.

7. The linear regulator according to claim 6, characterized in that: The current sharing control circuit includes a current sampling circuit and a transimpedance amplifier; The input end of the current sampling circuit is used to connect to the output end of the voltage regulation module to generate a sampling current of the first adjacent linear regulator, the first output end is used to connect to the current sharing control circuit of the second adjacent linear regulator, and the second output end is used to connect to the transimpedance amplifier of the first adjacent linear regulator; the current sampling circuit is used to sample the output current of the linear regulator, and the sampled currents of the first adjacent linear regulator and the second adjacent linear regulator are used as inputs of the transimpedance amplifier to amplify the current error between the linear regulators; The transimpedance amplifier comprises a first input terminal and a second input terminal, the first input terminal being used to connect to the output terminal of the current sampling circuit of the first adjacent linear regulator; The second input end is used to connect to the output end of the current sampling circuit of the second adjacent linear regulator; the output end is used to connect to the error amplifier, the transimpedance amplifier is used to obtain the output voltage of the current sharing control, and the output voltage of the current sharing control is used to adjust the error amplifier.

8. The linear regulator according to claim 5, characterized in that: The error amplifier adopts a three-input amplifier, which includes a first input terminal, a second input terminal and a third input terminal. The first input terminal is used to obtain a reference voltage signal, the second input terminal is used to obtain a feedback voltage signal, and the third input terminal is used to obtain a current-sharing voltage signal; the input port of the three-input amplifier includes a plurality of parallel input transistors; the weight configuration of the voltage stabilization loop and the current-sharing loop is adjusted according to the size of the input transistor.

9. The linear regulator according to claim 5, characterized in that: The voltage regulation module includes a voltage buffer and a power tube. The input end of the voltage buffer is used to connect to the error amplifier, and the output end is used to connect to the gate of the power tube; the source of the power tube is used to connect to the power supply; and the drain is used to generate an output voltage.

10. The linear regulator according to claim 5, characterized in that: The linear voltage regulator further includes a first compensation module and a second compensation module. The first compensation module is used to be arranged in parallel on both sides of the voltage regulation module; the second compensation module is used to be arranged in parallel on both sides of the transimpedance amplifier.

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