A linear voltage regulator and loop weight adjustment method thereof

Abstract

The present invention relates to the technical field of integrated circuits and power supplies, and particularly to a linear voltage regulator and a loop weight adjustment method thereof. The voltage regulator comprises an error amplifier, a feedback module, a current sharing control circuit and a voltage regulation module; the input end of the error amplifier is respectively used to electrically connect to the feedback module, a reference voltage source and the current sharing control circuit; the output end is used to connect to the input end of the voltage regulation module, and the error amplifier is used to configure the weights of a voltage stabilization loop and a current sharing loop according to an input signal; the output end of the voltage regulation module is used to be connected to the error amplifier through a feedback module; 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 jointly adjust the error amplifier 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. The voltage regulator has a simple structure and strong versatility.

Description

Technical Field

[0001] The present 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 regulators are an important branch of power management chips, capable of providing a stable output voltage for the system. Low-Dropout Voltage Regulators (LDOs) have a simple structure, low power consumption, fast load response, strong power supply rejection (PSR), and are easy to integrate, making them the primary power supply for micro devices.

[0003] Different application scenarios place different performance requirements on 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. Multiple control loops are required to achieve various performance requirements.

[0004] To meet the demand for high transient performance, LDOs need to add a transient enhancement loop to quickly charge and discharge the parasitic capacitance of the power tube gate. To meet the demand for a high power supply rejection ratio, LDOs need to add a PSR boost loop to suppress input voltage ripple and improve the quality of the LDO output voltage. To meet the demand for current sharing when powering parallel LDOs, a current sharing control loop is needed to control the output current of each LDO. As the demand for LDO performance continues to increase, multiple loops are included in a single LDO, and these loops influence each other and compete for control.

[0005] Currently, little research has been conducted on loop weights in LDOs. Most multi-loop circuits have low auxiliary loop gain to ensure improved auxiliary performance without affecting the main loop. These circuits cannot directly adjust the weights; instead, the multi-loop structure is modified to adjust the weights of the different loops and achieve current sharing.

[0006] While traditional current-sharing methods can alleviate the current-sharing problem to a certain extent, they also suffer from numerous drawbacks. For example, current-sharing performance is overly dependent on the matching of external components, which is difficult to accurately guarantee in practical applications. The introduction of current-sharing circuits often negatively impacts the performance of the LDO itself, such as reducing the power supply ripple rejection ratio or increasing power consumption. Traditional current-sharing circuits often utilize centralized control, which limits the scalability of LDO systems and makes it difficult to meet the needs of large-scale parallel connections. Furthermore, complex current-sharing wiring, poor current-sharing accuracy, and large footprints hinder integration, further limiting their application 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 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 purpose of the present invention is achieved by the following technical solutions:

[0010] In a first aspect, the present invention provides a method for adjusting loop weight of a linear regulator, comprising:

[0011] 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;

[0012] The current sharing voltage signal, the feedback voltage signal and the reference voltage signal are input into the error amplifier for adjustment, thereby realizing the weight configuration between the voltage regulation loop and the current sharing loop of the linear regulator.

[0013] 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:

[0014] By changing the input transistor size of the error amplifier, the total control quantity related to each loop of the linear regulator is obtained. Based on the total control quantity, the control weights of the voltage regulation loop and the current sharing loop are configured, specifically including:

[0015]

[0016]

[0017] Where, 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.

[0018] 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:

[0019]

[0020]

[0021]

[0022] Where, The size of the input transistor corresponding to the feedback voltage signal, The size of the input transistor corresponding to the reference voltage signal, is the size of the input transistor corresponding to the current-sharing voltage signal.

[0023] 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:

[0024] 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.

[0025] 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;

[0026] 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 jointly adjust the error amplifier 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.

[0027] 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.

[0028] As a further improvement of the present invention, the current sharing control circuit includes a current sampling circuit and a transimpedance amplifier;

[0029] 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;

[0030] The transimpedance amplifier includes a first input end and a second input end, the first input end is used to connect to the output end 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.

[0031] 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 by adjusting the size of the input transistor.

[0032] 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.

[0033] 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.

[0034] 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, and 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, is suitable for powering high-power loads, and does not require external current sharing control circuits and component matching, which simplifies the circuit design and reduces the system complexity and cost.

[0035] Furthermore, the loop weight configuration scheme proposed in this invention is simple in structure and highly versatile, enabling the weight configuration of multiple loops without requiring additional circuit design or power consumption. Weights are related to input tube size, so simply changing the input tube size allows for loop weight configuration. The weights of each loop can be configured to achieve the desired performance based on the needs of different scenarios.

[0036] Furthermore, a transimpedance amplifier precisely amplifies and converts the current error, achieving high-precision current balancing control. Adjusting the transimpedance amplifier's gain allows for flexible adjustments to the response speed and accuracy of the current-sharing control loop. This circuit has a simple structure and a small chip area, making it suitable for highly integrated applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0038] Figure 1 Schematic diagram of an LDO weight configuration scheme for k loops in an embodiment of the present invention.

[0039] Figure 2 1 is a block diagram of the overall structure of the LDO in an embodiment of the present invention.

[0040] Figure 3 Schematic diagram of a three-input amplifier in an embodiment of the present invention.

[0041] Figure 4 This is a current-sharing circuit with four LDOs connected in parallel in an embodiment of the present invention.

[0042] Figure 5This 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.

[0043] Figure 6 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 1:1.

[0044] Figure 7 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 1:3. DETAILED DESCRIPTION

[0045] 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 with reference to 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.

[0046] Explanation of terms:

[0047] MP (Metal-Oxide-Semiconductor Field-Effect Transistor Positive): Positive input MOSFET.

[0048] MN (Metal-Oxide-Semiconductor Field-Effect Transistor Negative): Negative input MOSFET.

[0049] The technical solutions of the present invention will be described clearly and completely below with reference to the accompanying drawings and specific embodiments. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0050] Example 1

[0051] like Figure 1-Figure 7 As shown, this embodiment provides a linear voltage regulator. The current sharing control circuit is integrated into each LDO chip to achieve modularity, and the above-mentioned loop weight configuration scheme is applied to configure the current sharing weight. The system's current sharing control is achieved through a simple expansion of the current sharing control port, without the need for any centralized control or external matching. The linear voltage regulator includes an error amplifier, a feedback module, a current sharing control circuit, and a voltage regulation module.

[0052] 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. The error amplifier is used to configure the weights of the voltage regulation loop and the current sharing loop according to the input signal.

[0053] The output terminal of the voltage regulation module is used to be connected to the error amplifier through the feedback module.

[0054] 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 achieve the weight configuration of the voltage stabilization loop and the current sharing loop.

[0055] Specifically, the error amplifier utilizes a three-input amplifier, comprising 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, 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 ports of the three-input amplifier internally include several parallel-connected input transistors. The weighting configuration of the voltage regulation loop and the current-sharing loop is adjusted by adjusting the size of the input transistor corresponding to each signal.

[0056] Specifically, when the LDO has multiple loops, the weight configuration of each loop can be changed through the multi-input error amplifier input tube. For example, when the LDO has k-1 other 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 transistor MP remains unchanged, and the original input feedback voltage MOS transistor MN 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.

[0057] The sizes of k transistors are 、 、 This is equivalent to generating a new signal with each loop 、 … The relevant control amount .

[0058] The control quantity satisfies:

[0059] in, represents the control weight of loop i , specifically including:

[0060]

[0061] It should be noted that the size of each transistor must meet the following requirements:

[0062]

[0063] 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, the weights satisfy the following relationship:

[0064]

[0065]

[0066] By changing the sizes of the k input transistors of the error amplifier to configure the loop control weight, application requirements in different scenarios can be met.

[0067] like Figure 3 As shown, for the current-sharing LDO circuit with two loops, unlike the two-input error amplifier of the traditional LDO, a three-input amplifier is used in this embodiment to achieve the integration of voltage regulation control and current sharing control: the original MOS transistor for inputting feedback voltage is split into two parallel MOS transistors, which input the feedback voltage VFB and the output voltage VCS of the current sharing control respectively, and the other MOS transistor for inputting the reference voltage VREF remains unchanged. The sizes of the three transistors are 、 and This is equivalent to generating a new control variable related to both the feedback voltage and the current sharing voltage, and also generates two control loops: a voltage regulation loop that adjusts the output voltage and a current sharing loop that adjusts the current sharing error.

[0068] Specifically include:

[0069]

[0070] Where, 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 Included

[0072]

[0073]

[0074] Where, The size of the input transistor corresponding to the feedback voltage signal, The size of the input transistor corresponding to the reference voltage signal, 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:

[0075]

[0076] Otherwise, the loads on both sides of the three-input amplifier will flow through different currents and enter the linear region, losing the regulation ability. And the control weight of the current sharing loop satisfy:

[0077]

[0078] By adjusting the sizes of the error amplifier's three input transistors to configure loop control weights, the voltage regulation loop and the current sharing loop are superimposed according to their weights. This high-gain loop adjusts both the output voltage error and the current sharing control error, achieving a fusion of LDO voltage regulation and current sharing between adjacent LDOs. When high LDO output accuracy and transient performance requirements are required, the voltage regulation loop's control weight can be increased; when high current sharing accuracy is required between LDOs, the current sharing loop's control weight can be increased.

[0079] The current-sharing control circuit includes a current sampling circuit (Current Sensing) and a transimpedance amplifier (TIA). The input of the current sampling circuit is connected to the output of the voltage regulation module. The first output terminal (IS1) is connected to the current-sharing control circuit of the second adjacent linear regulator, specifically to the transimpedance amplifier of the second adjacent linear regulator. The second output terminal is connected to the transimpedance amplifier of the first adjacent linear regulator. The current sampling circuit is used to sample the output current of the linear regulators, and the sampled current of the first adjacent linear regulator and the sampled current IM1 of the second adjacent linear regulator are used as inputs to the transimpedance amplifier to amplify the current error between the linear regulators.

[0080] The transimpedance amplifier includes a first input terminal and a second input terminal. The first input terminal is connected to the output terminal of the current sampling circuit of the first adjacent linear regulator; the second input terminal is connected to the output terminal IM1 of the current sampling circuit of the second adjacent linear regulator; and the output terminal is connected to the error amplifier. The transimpedance amplifier is used to obtain an output voltage for current sharing control, which is used to adjust the error amplifier. To accommodate a wide range of loads, in this embodiment, the input terminal of the transimpedance amplifier uses a variable resistor to match the amplifier's input swing.

[0081] The voltage regulation module includes a voltage buffer (Buf) and a power transistor. The voltage buffer's input is connected to the error amplifier, and its output is connected to the power transistor's gate. The power transistor's source is connected to the power supply. Furthermore, the feedback module's input is connected to the power transistor's drain, and its output is connected to the error amplifier's input. The drain generates the output voltage. The current sampling circuit uses a current mirror to replicate the output current, with its input located in the line between the voltage buffer and the power transistor.

[0082] The linear voltage regulator further includes a first compensation module comp1 and a second compensation module comp2. The first compensation module is arranged on both sides of the voltage regulation module; the second compensation module is arranged on both sides of the transimpedance amplifier to stabilize the circuit frequency response.

[0083] 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. 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 jointly adjusted as the input of the three-input error amplifier. The voltage stabilization loop and the current sharing loop can simultaneously adjust the output voltage of the LDO and the current error between adjacent LDOs by configuring the loop weights to achieve the fusion of voltage stabilization control and current sharing control.

[0084] 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 each two adjacent LDOs to be equal, and 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, which is highly flexible and very suitable for parallel on-chip power supply for high-power loads.

[0085] 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 carried out. The entire circuit operates under a power supply voltage of 1.8V. It has two loops: a voltage stabilization loop for adjusting the output voltage and a current sharing loop for adjusting the current sharing error, achieving an output voltage of 1.5V-1.7V and a maximum load of 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.

[0086] 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 The simulation waveforms for ratios of 3:1, 1:1, and 1:3 show that as the current-sharing loop weight increases, the currents of each LDO converge faster and the difference decreases. As the voltage-regulation loop weight increases, the output voltage of each LDO stabilizes faster and has smaller fluctuations. There's a trade-off between these two performance characteristics, and different loop weights can be selected based on application requirements: increasing the current-sharing loop weight results in faster current-sharing response during transients; increasing the voltage-regulation loop weight results in faster output voltage response during transients.

[0087] Example 2

[0088] This embodiment provides a method for adjusting loop weight of a linear regulator based on the linear regulator described in Example 1. The method mainly includes the following steps:

[0089] 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;

[0090] The current sharing voltage signal, the feedback voltage signal and the reference voltage signal are input into the error amplifier for adjustment, thereby realizing the weight configuration between the voltage regulation loop and the current sharing loop of the linear regulator.

[0091] Specifically, this embodiment mainly adjusts the size of the input transistor of the error amplifier to achieve weight configuration. By changing the size of the input transistor of the error amplifier, the total control quantity related to each loop of the linear regulator is obtained. Based on the total control quantity, the control weight of the voltage regulation loop and the control weight of the current sharing loop are configured, specifically including:

[0092]

[0093]

[0094] Where, 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.

[0095] Among them, the control weight of the voltage regulation loop And the control weight of the current sharing loop They include:

[0096]

[0097]

[0098]

[0099] Where, The size of the input transistor corresponding to the feedback voltage signal, The size of the input transistor corresponding to the reference voltage signal, is the size of the input transistor corresponding to the current-sharing voltage signal.

[0100] By adjusting the sizes of the error amplifier's three input transistors to configure the loop control weights, the voltage regulation loop and the current sharing loop are superimposed according to their weights. Through a high-gain loop, the output voltage error and current sharing control error are adjusted, achieving a fusion of LDO voltage regulation and current sharing between adjacent LDOs. When the linear regulator's output voltage accuracy and transient performance fall below a 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 linear regulators falls below a 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; Obtaining 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, thereby realizing the weight configuration between the voltage regulation loop and the current-sharing loop of the linear regulator; The current-sharing voltage signal, the feedback voltage signal, and the reference voltage signal are input into the error amplifier for adjustment, specifically including: By changing the input transistor size of the error amplifier, the total control quantity related to each loop of the linear regulator is obtained. Based on the total control quantity, the control weights of the voltage regulation loop and the current sharing loop are configured, specifically including: Where, 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.

2. The linear regulator loop weight adjustment method according to claim 1, characterized in that: The control weight of the voltage regulation loop And the control weight of the current sharing loop They include: Where, The size of the input transistor corresponding to the feedback voltage signal, The size of the input transistor corresponding to the reference voltage signal, is the size of the input transistor corresponding to the current-sharing voltage signal.

3. The linear regulator loop weight adjustment method according to claim 1, wherein: Based on the total control amount, the control weights of the voltage regulation loop and 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.

4. A linear regulator, used to implement the linear regulator loop weight adjustment method according to any one of claims 1 to 3, 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 jointly adjust the error amplifier 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.

5. The linear regulator according to claim 4, wherein: 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.

6. The linear regulator according to claim 5, wherein: 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.

7. The linear regulator according to claim 6, wherein: 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 by adjusting the size of the input transistors.

8. The linear regulator according to claim 4, wherein: 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 the output voltage.

9. The linear regulator according to claim 4, wherein: 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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