Driving circuit for low-dropout regulator, and chip

Abstract

Disclosed in the present application are a driving circuit for a low-dropout regulator, and a chip. The driving circuit comprises: a reference voltage generation module, a bias current generation module and a selection module, wherein the selection module is connected to both the reference voltage generation module and the bias current generation module, and receives a control signal, the selection module outputs a target bias current and a first reference voltage to a low-dropout regulator during a first time period on the basis of the control signal, such that the low-dropout regulator switches from a first power consumption mode to a second power consumption mode, and the selection module outputs a second reference voltage to the low-dropout regulator after the first time period, so as to maintain the second power consumption mode, the power consumption of the first power consumption mode being less than the power consumption of the second power consumption mode, the target bias current gradually increasing to a preset value over time, and the second reference voltage being established by the reference voltage generation module within the first time period. In this way, the wake-up speed of a low-dropout regulator is increased, and the wake-up time of the low-dropout regulator is reduced.

Description

Low dropout linear regulator drive circuit and chip

[0001] This application claims priority to Chinese Patent Application No. 202411865009.9, filed on December 17, 2024, entitled “Drive Circuit and Chip for Low Dropout Linear Regulator”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of electronic circuits, specifically to drive circuits and chips suitable for low dropout linear regulators. Background Technology

[0003] As a key component of electronic products, chips typically have multiple power consumption modes. Chips switch between these modes to meet daily needs. However, switching between power consumption modes often takes time. The switching time of a chip's power consumption modes mainly depends on the power supply and clock setup speeds.

[0004] LDO (Low Dropout Regulator) is a common chip power supply, and how to shorten the switching time between LDO power modes is an urgent problem to be solved. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a driving circuit and chip suitable for low-dropout linear regulators, which can effectively increase the wake-up speed and reduce the wake-up time of low-dropout linear regulators.

[0006] One technical solution adopted in this application is: providing a driving circuit suitable for a low-dropout linear regulator, the driving circuit including: a reference voltage generation module, a bias current generation module, and a selection module, the selection module being connected to the reference voltage generation module and the bias current generation module respectively; wherein, the reference voltage generation module is used to generate a first reference voltage and a second reference voltage; the accuracy of the second reference voltage is greater than the accuracy of the first reference voltage; the bias current generation module is used to generate a target bias current; the selection module is used to receive a control signal, and based on the control signal, output the target bias current and the first reference voltage to the low-dropout linear regulator in a first time period, thereby causing the low-dropout linear regulator to switch from a first power consumption mode to a second power consumption mode, and outputting the second reference voltage to the low-dropout linear regulator after the first time period to maintain the second power consumption mode; the power consumption of the first power consumption mode is less than the power consumption of the second power consumption mode, and the target bias current gradually increases to a preset value over time; the second reference voltage is established by the reference voltage generation module in the first time period.

[0007] In one embodiment, the bias current generating module includes: a first current source and a second current source, the input terminal of the first current source being coupled to a working voltage terminal, and the output terminal of the first current source being coupled to a selection module; the input terminal of the second current source being coupled to the working voltage terminal, and the output terminal of the second current source being coupled to the selection module; wherein, the first current source is used to generate a first bias current; the second current source is used to generate a second bias current; the target bias current is equal to the sum of the first bias current and the second bias current, and the accuracy of the first bias current is greater than the accuracy of the second bias current.

[0008] In one embodiment, the bias current generating module further includes: at least two auxiliary current sources, the input terminal of each auxiliary current source being coupled to the operating voltage terminal, and the output terminal of each auxiliary current source being coupled to the selection module, for generating auxiliary bias current; wherein, the target bias current is equal to the sum of the first bias current, the second bias current and the auxiliary bias current.

[0009] In one embodiment, the selection module includes: a control unit, a first switch, and a second switch. The control terminal of the first switch is coupled to the control unit, and the first terminal of the first switch is coupled to the output terminals of the first current source and the second current source, and the first terminal of the first switch is coupled to a low-dropout linear regulator. The control terminal of the second switch is coupled to the control unit, and the first terminal of the second switch is coupled to the output terminal of the auxiliary current source, and the first terminal of the second switch is coupled to the first terminal of the first switch. The control unit is used to control the first switch and the second switch to be turned on so that the bias current generating module outputs a target bias current to the low-dropout linear regulator.

[0010] In one embodiment, the bias current generation module includes: a first current source and at least two second current sources, the input terminal of the first current source being coupled to a working voltage terminal, and the output terminal of the first current source being coupled to a selection module; the input terminal of each second current source being coupled to a working voltage terminal, and the output terminal of each second current source being coupled to the selection module; wherein, the first current source is used to generate a first bias current; the second current sources are used to generate a second bias current; the accuracy of the first bias current is greater than the accuracy of the second bias current; the selection module uses the second bias current as a target bias current during the time when the first current source generates the first bias current and the reference voltage generation module generates the second reference voltage; after the first current source generates the first bias current and the reference voltage generation module generates the second reference voltage, the selection module uses the first bias current as the target bias current.

[0011] In one embodiment, the selection module includes: a control unit, a first inverter, a first switch, a third switch, and a fourth switch. The input terminal of the first inverter is coupled to the control unit; the second terminal of the first switch is coupled to a low-dropout linear regulator; the control terminal of the third switch is coupled to the input terminal of the first inverter, the first terminal of the third switch is coupled to the output terminal of a first current source, and the second terminal of the third switch is coupled to the first terminal of the first switch; the control terminal of the fourth switch is coupled to the output terminal of the first inverter, the first terminal of the fourth switch is coupled to the output terminal of an auxiliary current source, and the second terminal of the fourth switch is coupled to the first terminal of the third switch; wherein, during the time when the first current source generates a first bias current and the reference voltage generation module generates a second reference voltage, the control unit controls the third switch to open, and the first and fourth switches to close, using the second bias current as the target bias current; after the first current source generates the first bias current and the reference voltage generation module generates the second reference voltage, the control unit controls the first and third switches to close, and the fourth switch to open, using the first bias current as the target bias current.

[0012] In one embodiment, the reference voltage generation module includes: a first reference voltage generation unit and a second reference voltage generation unit, wherein the first reference voltage generation unit is coupled to a selection module and generates a first reference voltage; the second reference voltage generation unit is coupled to the selection module; wherein the first reference voltage generation unit is used to generate the first reference voltage; and the second reference voltage generation unit is used to generate a second reference voltage within a first time period.

[0013] In one embodiment, the selection module includes: a control unit, a second inverter, a fifth switch, and a sixth switch. The input terminal of the second inverter is coupled to the control unit; the control terminal of the fifth switch is coupled to the output terminal of the second inverter, the first terminal of the fifth switch is coupled to the output terminal of the first reference voltage generating unit, and the second terminal of the fifth switch is coupled to a low-dropout linear regulator; the control terminal of the sixth switch is coupled to the input terminal of the second inverter, the first terminal of the sixth switch is coupled to the output terminal of the second reference voltage generating unit, and the second terminal of the sixth switch is coupled to the second terminal of the fifth switch; wherein, based on a control signal, the control unit controls the fifth switch to be turned on and the sixth switch to be turned off during a first time period, outputting a first reference voltage to the low-dropout linear regulator, thereby causing the low-dropout linear regulator to switch from a first power consumption mode to a second power consumption mode, and after the first time period, controls the fifth switch to be turned off and the sixth switch to be turned on, outputting a second reference voltage to the low-dropout linear regulator.

[0014] In one embodiment, the duration of the first time period is greater than or equal to the establishment time of the second reference voltage.

[0015] This application also provides a driving method for a low-dropout linear regulator, wherein the low-dropout linear regulator is connected to a driving circuit, the driving circuit including: a reference voltage generation module, a bias current generation module, and a selection module, the selection module being connected to both the reference voltage generation module and the bias current generation module; the reference voltage generation module is used to generate a first reference voltage and a second reference voltage; the bias current generation module is used to generate a target bias current; the accuracy of the second reference voltage is greater than the accuracy of the first reference voltage, and the driving method includes:

[0016] Send a control signal to the selection module to control the selection module to output the target bias current and the first reference voltage to the low dropout linear regulator in the first time period, thereby switching the low dropout linear regulator from the first power consumption mode to the second power consumption mode.

[0017] After the first time period, the control selection module outputs a second reference voltage to the low dropout linear regulator to maintain the second power consumption mode; wherein, the power consumption of the first power consumption mode is less than the power consumption of the second power consumption mode, and the target bias current gradually increases to a preset value over time; the second reference voltage is established by the reference voltage generation module during the first time period.

[0018] This application also provides a chip including a low dropout linear regulator and a drive module connected to the low dropout linear regulator, the drive module including the drive circuit as described above.

[0019] This application also provides a driving module for a low-dropout linear regulator, wherein the low-dropout linear regulator is connected to a driving circuit, the driving circuit comprising: a reference voltage generation module, a bias current generation module, and a selection module, the selection module being connected to the reference voltage generation module and the bias current generation module respectively; the reference voltage generation module is used to generate a first reference voltage and a second reference voltage; the bias current generation module is used to generate a target bias current; the accuracy of the second reference voltage is greater than the accuracy of the first reference voltage, and the driving module is used for:

[0020] Send a control signal to the selection module to control the selection module to output the target bias current and the first reference voltage to the low dropout linear regulator in the first time period, thereby causing the low dropout linear regulator to switch from the first power consumption mode to the second power consumption mode;

[0021] After the first time period, the selection module is controlled to output the second reference voltage to the low dropout linear regulator to maintain the second power consumption mode; wherein the power consumption of the first power consumption mode is less than the power consumption of the second power consumption mode, and the target bias current gradually increases to a preset value over time; the second reference voltage is established by the reference voltage generation module during the first time period.

[0022] This application also provides a computer-readable storage medium storing computer-executable instructions, which are executed by a processor as described above in the driving method.

[0023] This application also provides a computer program, the computer program product including a computer program stored in a computer-readable storage medium, at least one processor can read the computer program from the computer-readable storage medium, and the at least one processor can execute the above-described driving method when executing the computer program.

[0024] The driving circuit for a low-dropout linear regulator provided in this application includes: a reference voltage generation module, a bias current generation module, and a selection module. The selection module is connected to both the reference voltage generation module and the bias current generation module. The reference voltage generation module generates a first reference voltage and a second reference voltage. The accuracy of the second reference voltage is greater than that of the first reference voltage. The bias current generation module generates a target bias current. The selection module receives a control signal and, based on the control signal, outputs the target bias current and the first reference voltage to the low-dropout linear regulator during a first time period, thereby switching the low-dropout linear regulator from a first power consumption mode to a second power consumption mode. After the first time period, the selection module outputs a second reference voltage to the low-dropout linear regulator to maintain the second power consumption mode. The power consumption of the first power consumption mode is less than that of the second power consumption mode, and the target bias current gradually increases to a preset value over time. The second reference voltage is established by the reference voltage generation module during the first time period. By improving the bias current generation module in the above manner, a low-precision first reference voltage that maintains the first power consumption mode is used during the first time period to support the low-dropout linear regulator in switching from the first power consumption mode to the second power consumption mode. This allows the power consumption mode to be switched while a high-precision second reference voltage is being established, and the target bias current gradually increases to the preset value over time. It is not necessary to wait for the second reference voltage to be established and the bias current corresponding to the second power consumption mode to be established before switching the power consumption mode. After the first time period, the second reference voltage is output to the low-dropout linear regulator to maintain the second power consumption mode, thereby accelerating the switching speed of the second power consumption mode of the low-dropout linear regulator, reducing the overall switching time of the second power consumption mode of the low-dropout linear regulator, and improving the stability of the output voltage of the low-dropout linear regulator when switching between the two power consumption modes. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0026] Figure 1 is a schematic diagram of the first embodiment of the drive circuit of the low dropout linear regulator provided in this application;

[0027] Figure 2 is a schematic diagram of the second embodiment of the drive circuit of the low dropout linear regulator provided in this application;

[0028] Figure 3 is a schematic diagram of the third embodiment of the drive circuit of the low dropout linear regulator provided in this application;

[0029] Figure 4 is a schematic diagram of the fourth embodiment of the driving circuit of the low dropout linear regulator provided in this application;

[0030] Figure 5 is a schematic diagram of the fifth embodiment of the drive circuit of the low dropout linear regulator provided in this application;

[0031] Figure 6 is a schematic diagram of an embodiment of the low dropout linear regulator provided in this application;

[0032] Figure 7 is a timing diagram of the drive circuit of the low dropout linear regulator provided in this application;

[0033] Figure 8 is a flowchart illustrating the driving method of the low-dropout linear regulator provided in this application;

[0034] Figure 9 is a schematic diagram of the structure of an embodiment of the chip provided in this application.

[0035] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0037] The terms "first," "second," etc., used in this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] Referring to Figure 1, Figure 1 is a schematic diagram of the structure of the first embodiment of the driving circuit of the low dropout linear regulator provided in this application. The driving circuit 100 includes a reference voltage generation module 10, a bias current generation module 20, and a selection module 30, with the selection module 30 connected to the reference voltage generation module 10 and the bias current generation module 20 respectively.

[0040] The reference voltage generation module 10 is used to generate a first reference voltage LPBG_VREF and a second reference voltage HPBG_VREF; the accuracy of the second reference voltage HPBG_VREF is greater than the accuracy of the first reference voltage LPBG_VREF.

[0041] The bias current generation module 20 is used to generate the target bias current IB_LDO_HP.

[0042] Selection module 30 receives control signal HPLDO_EN and, based on control signal HPLDO_EN, outputs target bias current IB_LDO_HP and first reference voltage LPBG_VREF to low-dropout linear regulator during a first time period, thereby switching the low-dropout linear regulator from a first power consumption mode to a second power consumption mode. After the first time period, it outputs second reference voltage HPBG_VREF to the low-dropout linear regulator to maintain the second power consumption mode. The power consumption of the first power consumption mode is less than that of the second power consumption mode. The target bias current IB_LDO_HP gradually increases to a preset value over time. The second reference voltage HPBG_VREF is established by reference voltage generation module 10 during the first time period.

[0043] In some embodiments, the duration of the first time period is greater than or equal to the setup time of the second reference voltage HPBG_VREF.

[0044] For example, the low-dropout linear regulator has two operating modes: a low-power mode and a normal mode. In the low-power mode, the low-dropout linear regulator has a weaker driving capability and mainly powers a small number of modules operating in low-power mode. In the normal mode, the low-dropout linear regulator has a stronger driving capability and can power all functional modules simultaneously. In one embodiment, the first power mode corresponds to the low-power mode, and the second power mode corresponds to the normal mode.

[0045] For example, in the first power consumption mode, the bias current of the low dropout linear regulator is mainly provided by a current source with a fixed output current (not shown). At the same time, the target bias current IB_LDO_HP gradually increases to a preset value over time to improve the accuracy of the output voltage and current of the low dropout linear regulator.

[0046] For example, the current demand of the load may vary with changes in operating conditions. To ensure that the low-dropout linear regulator can provide stable output voltage and current while reducing unnecessary power consumption, the low-dropout linear regulator needs to switch between a low-power mode and a normal mode. When the load current demand is low, the low-dropout linear regulator may enter a low-power mode to reduce power consumption; when the load current demand is high, the low-dropout linear regulator will wake up from the low-power mode and operate in normal mode, providing high-precision output voltage and current.

[0047] For example, the drive circuit 100 of the low-dropout linear regulator is used to generate a reference voltage and a bias current. The reference voltage provides a stable voltage reference for the low-dropout linear regulator, which is compared with the feedback voltage to control the stability of the output voltage. The bias current is the quiescent current of the low-dropout linear regulator, used to maintain a stable output voltage and current. In low-power mode, the output accuracy requirement of the low-dropout linear regulator is lower, and a low-precision first reference voltage LPBG_VREF is used.

[0048] In normal mode, the low-dropout linear regulator requires high output accuracy, necessitating high reference voltage and bias current accuracy. A high-precision second reference voltage, HPBG_VREF, is used to ensure stable output voltage under varying load conditions. Similarly, bias current accuracy is lower in low-power mode and higher in normal mode.

[0049] For example, when the low dropout linear regulator wakes up, its reference voltage is the first reference voltage LPBG_VREF; after the second reference voltage HPBG_VREF is established, the reference voltage of the low dropout linear regulator switches to the second reference voltage HPBG_VREF, and the target bias current IB_LDO_HP also gradually increases to the preset value.

[0050] In this embodiment, the reference voltage and bias current are always present during the time period of switching from the first power mode to the second power mode, which ensures that there is no need to wait for the bias current to be established when switching modes, effectively reducing the wake-up time of the low dropout linear regulator.

[0051] Referring to Figures 2 and 3, which are schematic diagrams of the second and third embodiments of the drive circuit for the low dropout linear regulator provided in this application, the drive circuit 100 includes a reference voltage generation module 10, a bias current generation module 20, and a selection module 30, with the selection module 30 connected to both the reference voltage generation module 10 and the bias current generation module 20.

[0052] The reference voltage generation module 10 is used to generate a first reference voltage LPBG_VREF and a second reference voltage HPBG_VREF; the accuracy of the second reference voltage HPBG_VREF is greater than the accuracy of the first reference voltage LPBG_VREF.

[0053] The bias current generation module 20 is used to generate the target bias current IB_LDO_HP.

[0054] Selection module 30 receives control signal HPLDO_EN and, based on control signal HPLDO_EN, outputs target bias current IB_LDO_HP and first reference voltage LPBG_VREF to low-dropout linear regulator during a first time period, thereby switching the low-dropout linear regulator from a first power consumption mode to a second power consumption mode. After the first time period, it outputs second reference voltage HPBG_VREF to the low-dropout linear regulator to maintain the second power consumption mode. The power consumption of the first power consumption mode is less than that of the second power consumption mode. The target bias current IB_LDO_HP gradually increases to a preset value over time. The second reference voltage HPBG_VREF is established by reference voltage generation module 10 during the first time period.

[0055] In some optional embodiments, as shown in FIG2, the bias current generation module 20 includes: a first current source S1 and a second current source S2. The input terminal of the first current source S1 is coupled to the working voltage terminal, and the output terminal of the first current source S1 is coupled to the selection module 30; the input terminal of the second current source S2 is coupled to the working voltage terminal, and the output terminal of the second current source S2 is coupled to the selection module 30; wherein, the first current source S1 is used to generate a first bias current HPBG_IBIAS; the second current source S2 is used to generate a second bias current LPBG_IBIAS; the target bias current IB_LDO_HP is equal to the sum of the first bias current HPBG_IBIAS and the second bias current LPBG_IBIAS, and the accuracy of the first bias current HPBG_IBIAS is greater than the accuracy of the second bias current LPBG_IBIAS.

[0056] For example, a current source is used to provide bias current to the error amplifier in the low-dropout linear regulator. The performance of the error amplifier is affected by the accuracy of the bias current, which in turn affects parameters such as the gain of the error amplifier, thus affecting the output of the low-dropout linear regulator. In the first power mode, the driving capability of the low-dropout linear regulator is weak, and the accuracy requirement for the bias current is low. In the second power mode, the accuracy requirement for the bias current is high. The target bias current IB_LDO_HP is equal to the sum of the first bias current HPBG_IBIAS and the second bias current LPBG_IBIAS. During the wake-up period of the low-dropout linear regulator, the first bias current HPBG_IBIAS gradually increases, thereby causing the target bias current IB_LDO_HP to gradually increase to a preset value over time.

[0057] The ratio of the first bias current HPBG_IBIAS to the second bias current LPBG_IBIAS in the target bias current IB_LDO_HP can be selected according to the error amplifier's requirements for current accuracy and wake-up speed. The smaller the ratio of the second bias current LPBG_IBIAS, the higher the accuracy of the target bias current IB_LDO_HP; the higher the ratio of the second bias current LPBG_IBIAS, the faster the wake-up speed of the error amplifier.

[0058] In some embodiments, the selection module 30 includes a control unit 31 and a first switch SW1. The control terminal of the first switch SW1 is coupled to the control unit 31, the first terminal of the first switch SW1 is coupled to the output terminals of the first current source S1 and the second current source S2, and the first terminal of the first switch SW1 is coupled to a low-dropout linear regulator. The control unit 31 controls the first switch SW1 to be turned on, so that the bias current generation module 20 outputs a target bias current IB_LDO_HP to the low-dropout linear regulator.

[0059] For example, the control unit 31 may be an analog switch controller or similar device. The control unit 31 receives the control signal HPLDO_EN and controls the first switch SW1 to turn on and off according to the control signal HPLDO_EN. When the first switch SW1 is turned on, the target bias current IB_LDO_HP provided by the first current source S1 and the second power supply is output to the low dropout linear regulator.

[0060] In some optional embodiments, as shown in FIG3, the main difference between the drive circuit 100 of the low dropout linear regulator shown in FIG3 and the drive circuit 100 of the low dropout linear regulator shown in FIG2 is that the auxiliary current source S3 and the second switch SW2 are described. Therefore, the auxiliary current source S3 and the second switch SW2 are mainly described below. For other components in the drive circuit 100 of the low dropout linear regulator, please refer to the relevant description of the embodiment shown in FIG2. For example, the first switch SW1 in FIG3 can be referred to the description of the first switch SW1 in FIG2, and will not be repeated here.

[0061] In some embodiments, the bias current generating module 20 further includes: at least two auxiliary current sources S3, the input terminal of each auxiliary current source S3 being coupled to the working voltage terminal, and the output terminal of each auxiliary current source S3 being coupled to the selection module 30, for generating an auxiliary bias current LPBG_IBIAS1N; wherein, the target bias current IB_LDO_HP is equal to the sum of the first bias current HPBG_IBIAS, the second bias current LPBG_IBIAS, and the auxiliary bias current LPBG_IBIAS1N.

[0062] For example, the auxiliary current source S3 provides additional bias current during the wake-up period of the low-dropout linear regulator, which helps to accelerate the build-up speed of the error amplifier, enabling the low-dropout linear regulator to quickly reach a stable operating state, reducing the wake-up time, and increasing the driving capability of the low-dropout linear regulator in the first power mode. The number of auxiliary current sources S3 can be increased according to the circuit requirements.

[0063] In some embodiments, the selection module 30 further includes: a second switch SW2, the control terminal of the second switch SW2 being coupled to the control unit 31, the first terminal of the second switch SW2 being coupled to the output terminal of the auxiliary current source S3, and the first terminal of the second switch SW2 being coupled to the first terminal of the first switch SW1; wherein, the control unit 31 is used to control the first switch SW1 and the second switch SW2 to be turned on, so that the bias current generation module 20 outputs the target bias current IB_LDO_HP to the low dropout linear regulator.

[0064] For example, the first switch SW1 and the second switch SW2 are turned on simultaneously. At the instant of turn-on, the first bias current HPBG_IBIAS output by the first current source S1 has not yet been fully established. The target bias current IB_LDO_HP is mainly composed of the second bias current LPBG_IBIAS output by the second current source S2 and the auxiliary bias current LPBG_IBIAS1N output by the auxiliary current source S3. After a delay, the second switch SW2 is turned off to reduce the power consumption of the low dropout linear regulator.

[0065] In this embodiment, by rationally designing the number of current sources in the bias current generation module 20 and the auxiliary current source S3, as well as the switching delay shutdown strategy, the stability and output accuracy of the low dropout linear regulator can be significantly improved. At the same time, the wake-up speed of the low dropout linear regulator can be increased, power consumption can be saved, and the needs of various application scenarios can be met.

[0066] Referring to Figure 4, Figure 4 is a schematic diagram of the fourth embodiment of the driving circuit of the low dropout linear regulator provided in this application. The driving circuit 100 includes a reference voltage generation module 10, a bias current generation module 20, and a selection module 30, with the selection module 30 connected to the reference voltage generation module 10 and the bias current generation module 20 respectively.

[0067] The reference voltage generation module 10 is used to generate a first reference voltage LPBG_VREF and a second reference voltage HPBG_VREF; the accuracy of the second reference voltage HPBG_VREF is greater than the accuracy of the first reference voltage LPBG_VREF.

[0068] The bias current generation module 20 is used to generate the target bias current IB_LDO_HP.

[0069] Selection module 30 receives control signal HPLDO_EN and, based on control signal HPLDO_EN, outputs target bias current IB_LDO_HP and first reference voltage LPBG_VREF to low-dropout linear regulator during a first time period, thereby switching the low-dropout linear regulator from a first power consumption mode to a second power consumption mode. After the first time period, it outputs second reference voltage HPBG_VREF to the low-dropout linear regulator to maintain the second power consumption mode. The power consumption of the first power consumption mode is less than that of the second power consumption mode. The target bias current IB_LDO_HP gradually increases to a preset value over time. The second reference voltage HPBG_VREF is established by reference voltage generation module 10 during the first time period.

[0070] In some embodiments, the bias current generating module 20 includes: a first current source S1 and at least two second current sources S2. The input terminal of the first current source S1 is coupled to the operating voltage terminal, and the output terminal of the first current source S1 is coupled to the selection module 30. The input terminal of each second current source S2 is coupled to the operating voltage terminal, and the output terminal of each second current source S2 is coupled to the selection module 30. The first current source S1 is used to generate a first bias current HPBG_IBIAS; the second current sources S2 are used to generate a second bias current LPBG_IBIAS; the accuracy of the first bias current HPBG_IBIAS is greater than that of the second bias current LPBG_IBIAS. The accuracy of BG_IBIAS is determined by the following: During the time that the first current source S1 generates the first bias current HPBG_IBIAS and the reference voltage generation module 10 generates the second reference voltage HPBG_VREF, the selection module 30 uses the second bias current HPBG_IBIAS as the target bias current IB_LDO_HP; after the first current source S1 generates the first bias current HPBG_IBIAS and the reference voltage generation module 10 generates the second reference voltage HPBG_VREF, the selection module 30 uses the first bias current HPBG_IBIAS as the target bias current IB_LDO_HP. The number of second current sources S2 can be increased according to the circuit requirements.

[0071] In some embodiments, the selection module 30 includes: a control unit 31, a first inverter A1, a first switch SW1, a third switch SW3, and a fourth switch SW4. The input terminal of the first inverter A1 is coupled to the control unit 31; the second terminal of the first switch SW1 is coupled to a low-dropout linear regulator; the control terminal of the third switch SW3 is coupled to the input terminal of the first inverter A1, the first terminal of the third switch SW3 is coupled to the output terminal of the first current source S1, and the second terminal of the third switch SW3 is coupled to the first terminal of the first switch SW1; the control terminal of the fourth switch SW4 is coupled to the output terminal of the first inverter A1, the first terminal of the fourth switch SW4 is coupled to the output terminal of the auxiliary current source S3, and the second terminal of the fourth switch SW4 is coupled to the first terminal of the third switch SW3; wherein, the control unit 31 generates a first bias current HPBG_IBIAS from the first current source S1. During the time when the reference voltage generation module 10 generates the second reference voltage HPBG_VREF, the third switch SW3 is controlled to open, and the first switch SW1 and the fourth switch SW4 are turned on, so that the second bias current LPBG_IBIAS is used as the target bias current IB_LDO_HP; after the first current source S1 generates the first bias current HPBG_IBIAS and the reference voltage generation module 10 generates the second reference voltage HPBG_VREF, the control unit 31 controls the first switch SW1 and the third switch SW3 to turn on, and the fourth switch SW4 to open, so that the first bias current HPBG_IBIAS is used as the target bias current IB_LDO_HP.

[0072] For example, the low accuracy of the second bias current LPBG_IBIAS affects the accuracy of the target bias current IB_LDO_HP, as shown in Figure 4. In the first power consumption mode and the second power consumption mode, the first switch SW1 is always on. During the time when the first current source S1 generates the first bias current HPBG_IBIAS and the reference voltage generation module 10 generates the second reference voltage HPBG_VREF, the fourth switch SW4 is turned on, so that the loop between the second current source S2 and the low dropout linear regulator is connected, and the target bias current IB_LDO_HP is affected. HP is provided only by the second current source S2. The number of second current sources S2 can be increased according to the needs of the circuit to improve the wake-up speed of the low dropout linear regulator. After the first current source S1 generates the first bias current HPBG_IBIAS and the reference voltage generation module 10 generates the second reference voltage HPBG_VREF, the fourth switch SW4 is controlled to open and the third switch SW3 is turned on, so that the circuit between the first current source S1 and the low dropout linear regulator is connected. The target bias current IB_LDO_HP is provided only by the first current source S1, thereby improving the output accuracy of the low dropout linear regulator.

[0073] Referring to Figure 5, Figure 5 is a schematic diagram of the fifth embodiment of the driving circuit of the low dropout linear regulator provided in this application. The driving circuit 100 includes a reference voltage generation module 10, a bias current generation module 20, and a selection module 30, with the selection module 30 connected to both the reference voltage generation module 10 and the bias current generation module 20.

[0074] The reference voltage generation module 10 is used to generate a first reference voltage LPBG_VREF and a second reference voltage HPBG_VREF; the accuracy of the second reference voltage HPBG_VREF is greater than the accuracy of the first reference voltage LPBG_VREF.

[0075] The bias current generation module 20 is used to generate the target bias current IB_LDO_HP.

[0076] Selection module 30 receives control signal HPLDO_EN and, based on control signal HPLDO_EN, outputs target bias current IB_LDO_HP and first reference voltage LPBG_VREF to low-dropout linear regulator during a first time period, thereby switching the low-dropout linear regulator from a first power consumption mode to a second power consumption mode. After the first time period, it outputs second reference voltage HPBG_VREF to the low-dropout linear regulator to maintain the second power consumption mode. The power consumption of the first power consumption mode is less than that of the second power consumption mode. The target bias current IB_LDO_HP gradually increases to a preset value over time. The second reference voltage HPBG_VREF is established by reference voltage generation module 10 during the first time period.

[0077] In some embodiments, the reference voltage generation module 10 includes: a first reference voltage generation unit 11 and a second reference voltage generation unit 12, wherein the first reference voltage generation unit 11 is coupled to the selection module 30; and the second reference voltage generation unit 12 is coupled to the selection module 30; wherein the first reference voltage generation unit 11 is used to generate a first reference voltage LPBG_VREF; and the second reference voltage generation unit 12 is used to generate a second reference voltage HPBG_VREF within a first time period.

[0078] In some embodiments, the selection module 30 includes: a control unit 31, a second inverter A2, a fifth switch SW5, and a sixth switch SW6. The input terminal of the second inverter A2 is coupled to the control unit 31; the control terminal of the fifth switch SW5 is coupled to the output terminal of the second inverter A2, the first terminal of the fifth switch SW5 is coupled to the output terminal of the first reference voltage generating unit 11, and the second terminal of the fifth switch SW5 is coupled to the low dropout linear regulator; the control terminal of the sixth switch SW6 is coupled to the input terminal of the second inverter A2, the first terminal of the sixth switch SW6 is coupled to the output terminal of the second reference voltage generating unit 12, and the second terminal of the sixth switch SW6 is coupled to the second terminal of the fifth switch SW5; wherein, the control unit 31 controls the fifth switch SW5 to be turned on and the sixth switch SW6 to be turned off in the first time period based on the control signal HPLDO_EN, and outputs the first reference voltage LPBG_VREF to the low dropout linear regulator, thereby switching the low dropout linear regulator from the first power consumption mode to the second power consumption mode, and after the first time period, controls the fifth switch SW5 to be turned off and the sixth switch SW6 to be turned on, and outputs the second reference voltage HPBG_VREF to the low dropout linear regulator.

[0079] For example, the second inverter A2 is used to invert the level of the output signal of the control unit 31, that is, when the fifth switch SW5 is turned on, the sixth switch SW6 is turned off, and when the fifth switch SW5 is turned off, the sixth switch SW6 is turned on. When the low dropout linear regulator enters the first power consumption mode, the fifth switch SW5 is turned on and the sixth switch SW6 is turned off, so that the path between the first reference voltage generation unit 11 and the low dropout linear regulator is connected, providing the first reference voltage LPBG_VREF to the low dropout linear regulator; when switching to the second power consumption mode, the fifth switch SW5 is turned off and the sixth switch SW6 is turned on, so that the path between the second reference voltage generation unit 12 and the low dropout linear regulator is connected, providing the second reference voltage HPBG_VREF to the low dropout linear regulator.

[0080] Referring to Figure 6, Figure 6 is a structural schematic diagram of an embodiment of the low dropout linear regulator provided in this application.

[0081] The low dropout linear regulator 600 is connected to the drive circuit 100, which includes a reference voltage generation module 10, a bias current generation module 20, and a selection module 30. The selection module 30 is connected to the reference voltage generation module 10 and the bias current generation module 20, respectively.

[0082] The reference voltage generation module 10 is used to generate a first reference voltage LPBG_VREF and a second reference voltage HPBG_VREF; the accuracy of the second reference voltage HPBG_VREF is greater than the accuracy of the first reference voltage LPBG_VREF.

[0083] The bias current generation module 20 is used to generate the target bias current IB_LDO_HP.

[0084] Selection module 30 receives control signal HPLDO_EN and, based on control signal HPLDO_EN, outputs target bias current IB_LDO_HP and first reference voltage LPBG_VREF to low-dropout linear regulator during a first time period, thereby switching the low-dropout linear regulator from a first power consumption mode to a second power consumption mode. After the first time period, it outputs second reference voltage HPBG_VREF to the low-dropout linear regulator to maintain the second power consumption mode. The power consumption of the first power consumption mode is less than that of the second power consumption mode. The target bias current IB_LDO_HP gradually increases to a preset value over time. The second reference voltage HPBG_VREF is established by reference voltage generation module 10 during the first time period.

[0085] The low-dropout linear regulator 600 includes a first error amplifier GMHP, a second error amplifier GMLP, a seventh switch SW7, an eighth switch SW8, a transistor M1, a first resistor R1, and a second resistor R2. The first error amplifier GMHP is connected to the selection module 30 and the second error amplifier GMLP, respectively, and is connected to the control terminal of the transistor M1 through the seventh switch SW7. The second error amplifier GMLP is connected to the selection module 30, the fourth current source S4, the control terminal of the transistor M1, and the load, respectively, and is grounded through the first resistor R1 and the second resistor R2. The first terminal of the first resistor R1 is connected to the second terminal of the transistor M1 and the first terminal of the second resistor R2. The second terminal of the first resistor R1 is grounded through the eighth switch SW8. The second terminal of the second resistor R2 is grounded.

[0086] In the low-dropout linear regulator 600, when it is operating, the second error amplifier GMLP receives the bias current LPBG_IBIAS2 output from the fourth current source S4 and the reference voltage signal output from the reference voltage generation module 10. The first error amplifier GMHP receives the reference voltage signal output from the reference voltage generation module 10 and the target bias current IB_LDO_HP generated by the bias current generation module 20. In the first power consumption mode, the first error amplifier GMHP, the seventh switch SW7, and the eighth switch SW8 are off, and the output of the low-dropout linear regulator 600 is mainly composed of the voltage output by the second error amplifier GMLP under the action of the bias current LPBG_IBIAS2 and the first reference voltage LPBG_VREF. In the second power consumption mode, the first error amplifier GMHP, the seventh switch SW7, and the eighth switch SW8 are on, and the output of the low-dropout linear regulator 600 is mainly composed of the voltage output by the first error amplifier GMHP under the action of the target bias current IB_LDO_HP and the second reference voltage HPBG_VREF. At the same time, the second error amplifier GMLP will continue to operate.

[0087] Referring to Figure 7, Figure 7 is a timing diagram of the drive circuit of the low dropout linear regulator provided in this application.

[0088] The low-dropout linear regulator can be the low-dropout linear regulator 600 shown in Figure 6, and the driving circuit is the driving circuit 100 mentioned above, which will not be described again here.

[0089] Before waking up, the bias current of the low dropout linear regulator is provided by the bias current LPBG_IBIAS2 of the second error amplifier GMLP, and the reference voltage is the first reference voltage LPBG_VREF. At this time, the target bias current IB_LDO_HP is 0, the first error amplifier GMHP is in the off state, and the output of the low dropout linear regulator is mainly provided by the second error amplifier GMLP.

[0090] Upon initial wake-up, the control signal HPLDO_EN goes high, activating the first error amplifier GMHP. At this time, the first reference voltage LPBG_VREF and the second bias current LPBG_IBIAS remain high, causing the output LDO_OUT of the low-dropout linear regulator to also remain high. When switching to the second power mode, the second reference voltage HPBG_VREF and the first bias current HPBG_IBIAS are established. The target bias current IB_LDO_HP increases with the increase of the first bias current HPBG_IBIAS, ensuring that the output LDO_OUT of the low-dropout linear regulator remains high. Here, t1 represents the delay time of the control signal HPLDO_EN, and t2 represents the establishment time of the second reference voltage HPBG_VREF. To ensure that the second reference voltage HPBG_VREF is fully established before switching the reference voltage, t1 needs to be greater than t2.

[0091] By using the above method, the low-dropout linear regulator can maintain a stable output during wake-up, and the wake-up time can be considered to be 0µs.

[0092] Referring to Figure 8, which is a flowchart of the driving method for the low-dropout linear regulator provided in this application, the low-dropout linear regulator is connected to a driving circuit. This driving circuit includes: a reference voltage generation module, a bias current generation module, and a selection module. The selection module is connected to both the reference voltage generation module and the bias current generation module. The reference voltage generation module generates a first reference voltage and a second reference voltage. The bias current generation module generates a target bias current. The accuracy of the second reference voltage is greater than that of the first reference voltage. The driving method includes:

[0093] Step S81: Send a control signal to the selection module to control the selection module to output the target bias current and the first reference voltage to the low dropout linear regulator in the first time period, thereby switching the low dropout linear regulator from the first power consumption mode to the second power consumption mode.

[0094] Step S82: After the first time period, the control selection module outputs a second reference voltage to the low dropout linear regulator to maintain the second power consumption mode; wherein, the power consumption of the first power consumption mode is less than the power consumption of the second power consumption mode, and the target bias current gradually increases to a preset value over time; the second reference voltage is established by the reference voltage generation module during the first time period.

[0095] Referring to Figure 9, which is a schematic diagram of a chip embodiment provided in this application, the chip 1000 includes a low-dropout linear regulator 200 and a drive module 300. The drive module 300 is connected to the low-dropout linear regulator 100 and includes the drive circuit 100 as described above.

[0096] This application also provides a driving module for a low-dropout linear regulator. The low-dropout linear regulator is connected to a driving circuit, which includes: a reference voltage generation module, a bias current generation module, and a selection module. The selection module is connected to both the reference voltage generation module and the bias current generation module. The reference voltage generation module generates a first reference voltage and a second reference voltage. The bias current generation module generates a target bias current. The accuracy of the second reference voltage is greater than that of the first reference voltage. The driving module is used for:

[0097] Send a control signal to the selection module to control the selection module to output the target bias current and the first reference voltage to the low dropout linear regulator in the first time period, thereby switching the low dropout linear regulator from the first power consumption mode to the second power consumption mode.

[0098] After the first time period, the control selection module outputs a second reference voltage to the low dropout linear regulator to maintain the second power consumption mode; wherein, the power consumption of the first power consumption mode is less than the power consumption of the second power consumption mode, and the target bias current gradually increases to a preset value over time; the second reference voltage is established by the reference voltage generation module during the first time period.

[0099] This application also provides a computer-readable storage medium storing computer-executable instructions, which are executed by a processor as described above in the driving method.

[0100] This application also provides a computer program, the computer program product including a computer program, the computer program being stored in a computer-readable storage medium, at least one processor being able to read the computer program from the computer-readable storage medium, and at least one processor executing the computer program being able to execute the above-described driving method.

[0101] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0102] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0103] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0104] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A drive circuit suitable for low dropout linear regulators, characterized in that, The driving circuit includes: a reference voltage generation module, a bias current generation module, and a selection module, wherein the selection module is connected to the reference voltage generation module and the bias current generation module respectively; The reference voltage generation module is used to generate a first reference voltage and a second reference voltage; the accuracy of the second reference voltage is greater than that of the first reference voltage. The bias current generation module is used to generate the target bias current; The selection module receives a control signal and, based on the control signal, outputs the target bias current and the first reference voltage to the low-dropout linear regulator during a first time period, thereby switching the low-dropout linear regulator from a first power consumption mode to a second power consumption mode. After the first time period, the module outputs the second reference voltage to the low-dropout linear regulator to maintain the second power consumption mode. The power consumption of the first power consumption mode is less than that of the second power consumption mode, and the target bias current gradually increases to a preset value over time. The second reference voltage is established by the reference voltage generation module during the first time period.

2. The driving circuit according to claim 1, characterized in that, The bias current generating module includes: a first current source and a second current source, wherein the input terminal of the first current source is coupled to the operating voltage terminal, and the output terminal of the first current source is coupled to the selection module; the input terminal of the second current source is coupled to the operating voltage terminal, and the output terminal of the second current source is coupled to the selection module. The first current source is used to generate the first bias current; The second current source is used to generate the second bias current; The target bias current is equal to the sum of the first bias current and the second bias current, and the accuracy of the first bias current is greater than the accuracy of the second bias current.

3. The driving circuit according to claim 2, characterized in that, The bias current generating module further includes: At least two auxiliary current sources are provided, with the input terminal of each auxiliary current source coupled to the operating voltage terminal and the output terminal of each auxiliary current source coupled to the selection module, for generating an auxiliary bias current; wherein the target bias current is equal to the sum of the first bias current, the second bias current and the auxiliary bias current.

4. The driving circuit according to claim 3, characterized in that, The selection module includes: a control unit, a first switch, and a second switch. The control terminal of the first switch is coupled to the control unit, and the first terminal of the first switch is coupled to the output terminals of the first current source and the second current source. The first terminal of the first switch is also coupled to the low-dropout linear regulator. The control terminal of the second switch is coupled to the control unit, and the first terminal of the second switch is coupled to the output terminal of the auxiliary current source. The first terminal of the second switch is also coupled to the first terminal of the first switch. The control unit is used to control the first switch and the second switch to be turned on, so that the bias current generating module outputs the target bias current to the low dropout linear regulator.

5. The driving circuit according to claim 1, characterized in that, The bias current generating module includes: a first current source and at least two second current sources, wherein the input terminal of the first current source is coupled to the operating voltage terminal, and the output terminal of the first current source is coupled to the selection module; the input terminal of each second current source is coupled to the operating voltage terminal, and the output terminal of each second current source is coupled to the selection module. Wherein, the first current source is used to generate a first bias current; the second current source is used to generate a second bias current; the accuracy of the first bias current is greater than the accuracy of the second bias current; During the time between the first current source generating the first bias current and the reference voltage generation module generating the second reference voltage, the selection module uses the second bias current as the target bias current. After the first current source generates the first bias current and the reference voltage generation module generates the second reference voltage, the selection module uses the first bias current as the target bias current.

6. The driving circuit according to claim 5, characterized in that, The selection module includes: a control unit, a first inverter, a first switch, a third switch, and a fourth switch. The input terminal of the first inverter is coupled to the control unit; the second terminal of the first switch is coupled to the low-dropout linear regulator; the control terminal of the third switch is coupled to the input terminal of the first inverter, the first terminal of the third switch is coupled to the output terminal of the first current source, and the second terminal of the third switch is coupled to the first terminal of the first switch; the control terminal of the fourth switch is coupled to the output terminal of the first inverter, the first terminal of the fourth switch is coupled to the output terminal of the second current source, and the second terminal of the fourth switch is coupled to the second terminal of the third switch. Wherein, during the time when the first current source generates the first bias current and the reference voltage generation module generates the second reference voltage, the control unit controls the third switch to open, and the first switch and the fourth switch to open, and the second bias current is used as the target bias current; After the first current source generates the first bias current and the reference voltage generation module generates the second reference voltage, the control unit controls the first switch and the third switch to be turned on, and the fourth switch to be turned off, so as to use the first bias current as the target bias current.

7. The driving circuit according to claim 1, characterized in that, The reference voltage generation module includes: a first reference voltage generation unit and a second reference voltage generation unit, wherein the first reference voltage generation unit is coupled to the selection module and the second reference voltage generation unit is coupled to the selection module; Wherein, the first reference voltage generating unit is used to generate the first reference voltage, and the second reference voltage generating unit is used to generate the second reference voltage within the first time period; and / or The selection module includes: a control unit, a second inverter, a fifth switch, and a sixth switch. The input terminal of the second inverter is coupled to the control unit. The control terminal of the fifth switch is coupled to the output terminal of the second inverter. The first terminal of the fifth switch is coupled to the output terminal of the first reference voltage generating unit, and the second terminal of the fifth switch is coupled to the low-dropout linear regulator. The control terminal of the sixth switch is coupled to the input terminal of the second inverter. The first terminal of the sixth switch is coupled to the output terminal of the second reference voltage generating unit, and the second terminal of the sixth switch is coupled to the second terminal of the fifth switch. The control unit controls the fifth switch to be turned on and the sixth switch to be turned off during the first time period based on the control signal, and outputs the first reference voltage to the low dropout linear regulator, thereby switching the low dropout linear regulator from the first power consumption mode to the second power consumption mode. After the first time period, the control unit controls the fifth switch to be turned off and the sixth switch to be turned on, and outputs the second reference voltage to the low dropout linear regulator.

8. The driving circuit according to any one of claims 1-7, characterized in that, The duration of the first time period is greater than or equal to the establishment time of the second reference voltage.

9. A driving method for a low-dropout linear regulator, characterized in that, The low-dropout linear regulator is connected to a drive circuit, which includes a reference voltage generation module, a bias current generation module, and a selection module. The selection module is connected to both the reference voltage generation module and the bias current generation module. The reference voltage generation module generates a first reference voltage and a second reference voltage. The bias current generation module generates a target bias current. The accuracy of the second reference voltage is greater than that of the first reference voltage. The driving method includes: Send a control signal to the selection module to control the selection module to output the target bias current and the first reference voltage to the low dropout linear regulator in the first time period, thereby causing the low dropout linear regulator to switch from the first power consumption mode to the second power consumption mode; After the first time period, the selection module is controlled to output the second reference voltage to the low dropout linear regulator to maintain the second power consumption mode; wherein the power consumption of the first power consumption mode is less than the power consumption of the second power consumption mode, and the target bias current gradually increases to a preset value over time; the second reference voltage is established by the reference voltage generation module during the first time period.

10. A drive module for a low-dropout linear regulator, characterized in that, The low-dropout linear regulator is connected to a drive circuit, which includes a reference voltage generation module, a bias current generation module, and a selection module. The selection module is connected to both the reference voltage generation module and the bias current generation module. The reference voltage generation module generates a first reference voltage and a second reference voltage. The bias current generation module generates a target bias current. The accuracy of the second reference voltage is greater than that of the first reference voltage. The drive module is used to: Send a control signal to the selection module to control the selection module to output the target bias current and the first reference voltage to the low dropout linear regulator in the first time period, thereby causing the low dropout linear regulator to switch from the first power consumption mode to the second power consumption mode; After the first time period, the selection module is controlled to output the second reference voltage to the low dropout linear regulator to maintain the second power consumption mode; wherein the power consumption of the first power consumption mode is less than the power consumption of the second power consumption mode, and the target bias current gradually increases to a preset value over time; the second reference voltage is established by the reference voltage generation module during the first time period.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which are executed by a processor according to the driving method of claim 9.

12. A computer program, characterized in that, The computer program product includes a computer program stored in a computer-readable storage medium, which at least one processor can read from the computer-readable storage medium, and which, when executing the computer program, can perform the driving method as described in claim 9.

13. A chip, characterized in that, The chip shown includes: Low dropout linear regulator; A drive module is connected to the low-dropout linear regulator, and the drive module includes the drive circuit as described in any one of claims 1-8.

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