WO2022105796A1 - 一种低压差线性稳压器及电子设备 - Google Patents

一种低压差线性稳压器及电子设备 Download PDF

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Publication number
WO2022105796A1
WO2022105796A1 PCT/CN2021/131207 CN2021131207W WO2022105796A1 WO 2022105796 A1 WO2022105796 A1 WO 2022105796A1 CN 2021131207 W CN2021131207 W CN 2021131207W WO 2022105796 A1 WO2022105796 A1 WO 2022105796A1
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Prior art keywords
capacitor
main switch
electrically connected
tube
auxiliary
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PCT/CN2021/131207
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English (en)
French (fr)
Inventor
朱元鹏
杨超
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上海艾为电子技术股份有限公司
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Application filed by 上海艾为电子技术股份有限公司 filed Critical 上海艾为电子技术股份有限公司
Priority to EP21893943.7A priority Critical patent/EP4235348A4/en
Priority to US18/252,934 priority patent/US20230418320A1/en
Publication of WO2022105796A1 publication Critical patent/WO2022105796A1/zh

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/575—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices characterised by the feedback circuit
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/561—Voltage to current converters
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/618—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series and in parallel with the load as final control devices

Definitions

  • the present invention relates to the technical field of power management, and more particularly, to a low-dropout linear voltage regulator and electronic equipment.
  • Low dropout regulator (LDO, Low Dropout Regulator) is an important circuit in the field of power management. It has the advantages of low output noise, low cost, simple structure and low power consumption, and is widely used in electronic systems. With the continuous improvement of power requirements for many portable electronic systems, the research of high-performance LDOs has become a research hotspot in the field of power management.
  • the present invention provides a low-dropout linear regulator and electronic equipment, which effectively solve the technical problems existing in the prior art.
  • the low-dropout linear regulator provided by the present invention has high loop stability in a standby state, Improved performance of low dropout linear regulators.
  • a low-dropout linear voltage regulator comprising: an operational amplifier, a power tube, a compensation capacitor, a resistance feedback unit, a control unit, a first capacitor and a second capacitor;
  • the inverting terminal of the operational amplifier is connected to the reference voltage, the non-inverting terminal of the operational amplifier is electrically connected to the output terminal of the resistance feedback unit, and the output terminal of the operational amplifier is connected to the first plate and the first plate of the compensation capacitor. the control end of the power tube is electrically connected;
  • the first end of the power tube is connected to the power supply voltage
  • the second end of the power tube is connected to the input end of the resistance feedback unit, the second pole plate of the compensation capacitor, and the first pole of the first capacitor
  • the plate is electrically connected to the control unit, and the second electrode plate of the first capacitor is electrically connected to the ground terminal;
  • the control unit is electrically connected to the first pole plate of the second capacitor, the second pole plate of the second capacitor is electrically connected to the ground terminal, and the control unit is used to control the first pole of the second capacitor The connection or disconnection between the plate and the second end of the power tube.
  • the capacitance of the second capacitor is greater than the capacitance of the first capacitor.
  • control unit includes at least one main switch tube and a main control module, the grid of the main switch tube is electrically connected to the main control module, and the first end of the main switch tube is connected to the power tube The second end of the main switch is electrically connected to the second end of the main switch tube and the first plate of the second capacitor is electrically connected.
  • control unit includes a plurality of the main switch tubes, which are respectively the first main switch tube to the Nth main switch tube, and the width-length ratio of the first main switch tube is smaller than that of the other main switch tubes.
  • Aspect ratio, N is an integer equal to or greater than 2;
  • the main control module is used to control the conduction of the first main switch tube to the Nth main switch tube one by one.
  • the width-to-length ratio of the i+1-th main switch tube is greater than the width-to-length ratio of the i-th main switch tube, and i is an integer equal to or greater than 1 and less than or equal to N-1.
  • control unit further includes at least one auxiliary switch tube, at least one current source, and an auxiliary control module, the auxiliary switch tube and the current source are in one-to-one correspondence, and the gate of the auxiliary switch tube is connected to the
  • the auxiliary control module is electrically connected, the first end of the auxiliary switch tube is electrically connected to the second end of the power tube, the second end of the auxiliary switch tube is electrically connected to one end of the current source, and the current The other end of the source is connected to the ground terminal;
  • the auxiliary control module is configured to control at least one of the auxiliary switch tubes to conduct conduction when the main control module controls the conduction of the main switch tubes.
  • the number of the auxiliary switch tubes is the same as the number of the main switch tubes, and the auxiliary control module is used to control the same number of auxiliary switches when the main control module controls the main switch tubes to be turned on.
  • the switch tube is turned on.
  • control unit when the control unit includes a plurality of the main switch tubes, which are respectively the first main switch tube to the Nth main switch tube, the control unit further includes a plurality of the auxiliary switch tubes are the first auxiliary switch tube to the Nth auxiliary switch tube;
  • the auxiliary control module is configured to control the jth auxiliary switch transistor to conduct when the main control module controls the jth main switch transistor to conduct, where j is an integer equal to or greater than 1 and less than or equal to N.
  • the current of the current source electrically connected to the first auxiliary switch tube is smaller than the current of the other current sources.
  • the current of the current source electrically connected to the Nth auxiliary switch tube is greater than the current of the other current sources.
  • the present invention also provides an electronic device, which includes the above-mentioned low-dropout linear regulator.
  • the technical solution provided by the present invention has at least the following advantages:
  • the invention provides a low-dropout linear voltage regulator and electronic equipment, comprising: an operational amplifier, a power tube, a compensation capacitor, a resistance feedback unit, a control unit, a first capacitor and a second capacitor; the inverting terminal of the operational amplifier The reference voltage is connected, the non-inverting terminal of the operational amplifier is electrically connected to the output terminal of the resistance feedback unit, and the output terminal of the operational amplifier is electrically connected to the first plate of the compensation capacitor and the control terminal of the power tube.
  • the first end of the power tube is connected to the power supply voltage
  • the second end of the power tube is connected to the input end of the resistance feedback unit
  • the second plate of the compensation capacitor is electrically connected to the control unit
  • the second pole plate of the first capacitor is electrically connected to the ground terminal
  • the control unit is electrically connected to the first pole plate of the second capacitor
  • the second capacitor The second electrode plate of the second capacitor is electrically connected to the ground terminal, and the control unit is used to control the connection or disconnection between the first electrode plate of the second capacitor and the second end of the power tube.
  • the low dropout linear voltage regulator provided by the present invention includes a control unit electrically connected with the second capacitor, and the control unit is used to control the connection or disconnection of the first plate of the second capacitor and the second end of the power tube. Therefore, when the low-dropout linear regulator is in the standby state, the control unit controls the disconnection between the first plate of the second capacitor and the second end of the power tube, so that the connection capacitance of the second end of the power tube is small, This ensures that the main pole at the control end of the power tube and the secondary pole at the second end of the power tube are separated, so that the low dropout linear regulator has high loop stability in the standby state, and the performance of the low dropout linear regulator is improved.
  • FIG. 1 is a schematic structural diagram of a low-dropout linear voltage regulator according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of another low dropout linear voltage regulator provided by an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of another low dropout linear voltage regulator provided by an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of another low dropout linear voltage regulator provided by an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another low-dropout linear voltage regulator according to an embodiment of the present invention.
  • Low Dropout Regulator As mentioned in the background art, Low Dropout Regulator (LDO, Low Dropout Regulator) is an important type of circuit in the field of power management. It has the advantages of low output noise, low cost, simple structure and low power consumption. It is widely used in in the electronic system. With the continuous improvement of power requirements for many portable electronic systems, the research of high-performance LDOs has become a research hotspot in the field of power management.
  • the embodiments of the present invention provide a low-dropout linear voltage regulator and electronic equipment, which effectively solve the technical problems existing in the prior art.
  • the low-dropout linear voltage regulator provided by the embodiments of the present invention has a stable loop in a standby state
  • the high performance improves the performance of the low dropout linear regulator.
  • FIG. 1 it is a schematic structural diagram of a low-dropout linear regulator provided by an embodiment of the present invention, wherein the low-dropout linear regulator includes:
  • the inverting terminal of the operational amplifier 100 is connected to the reference voltage VBG, the non-inverting terminal of the operational amplifier 100 is electrically connected to the output terminal of the resistance feedback unit 300, and the output terminal of the operational amplifier 100 is connected to the compensation capacitor Cc
  • the first electrode plate of the power tube 200 is electrically connected to the control terminal such as the grid of the power tube 200 .
  • the first end of the power tube 200 is connected to the power supply voltage VDD, the second end of the power tube 200 is connected to the input end of the resistance feedback unit 300, the second plate of the compensation capacitor Cc, the first The first electrode plate of the capacitor C1 is electrically connected to the control unit 400, and the second electrode plate of the first capacitor C1 is electrically connected to the ground terminal GND.
  • the control unit 400 is electrically connected to the first plate of the second capacitor C2, and the second plate of the second capacitor C2 is electrically connected to the ground terminal GND.
  • the control unit 400 is used to control the second plate.
  • the first plate of the capacitor C2 is connected or disconnected with the second end of the power tube 200 .
  • the resistance feedback unit 300 includes a first resistor R1 and a second resistor R2 connected in series, and the first resistor R1 and the second resistor R2 form a voltage divider circuit.
  • the first end of the first resistor R1 is connected to the second end of the power tube 200 (ie, the output end of the low-dropout linear regulator), and the second end of the second resistor R2 is connected to the ground end GND, and the first resistor
  • the second terminal of R1 and the first terminal of the second resistor R2 are connected to the non-inverting terminal of the operational amplifier 100 .
  • the resistance feedback unit provided by the embodiment of the present invention is used to collect the voltage output by the power tube, and then transmit the voltage output by the power tube to the operational amplifier, and the operational amplifier controls the power tube according to the voltage output by the resistance feedback unit and the reference voltage.
  • the compensation capacitor provided in the embodiment of the present invention is used for MILLER compensation, which further improves the stability of the loop.
  • the low dropout linear voltage regulator provided by the embodiment of the present invention includes a control unit that is electrically connected to the second capacitor, and the control unit is used to control the connection between the first electrode plate of the second capacitor and the second end of the power tube or disconnection; thus, when the low-dropout linear regulator is in the standby state, the control unit controls the disconnection between the first plate of the second capacitor and the second end of the power tube, so that the second end of the power tube is connected to the capacitor relatively Small, that is, only the first capacitor is connected, so as to ensure the separation of the main pole at the control end of the power tube and the secondary pole at the second end of the power tube, so that the low-dropout linear regulator has high loop stability in the standby state, improving the performance of low dropout linear regulators.
  • the capacitance of the second capacitor provided by the present invention is greater than the capacitance of the first capacitor, so that the first capacitor of the power tube can be ensured when the low dropout linear regulator is in a standby state.
  • the capacitors connected across the two terminals are smaller, further improving the loop stability of the low dropout linear regulator in the standby state.
  • FIG. 2 it is a schematic structural diagram of another low dropout linear voltage regulator provided by an embodiment of the present invention, wherein the control unit 400 provided by an embodiment of the present invention includes at least one main switch tube MP and a main control module 410, the gate of the main switch tube MP is electrically connected to the main control module 410, the first end of the main switch tube MP is electrically connected to the second end of the power tube 200, and the first end of the main switch tube MP is electrically connected to the second end of the power tube 200.
  • the two terminals are electrically connected to the first plate of the second capacitor C2.
  • control unit may be configured to include at least one main switch tube. and the main control module, wherein the main control module provides the main switch tube with an on or off signal, and controls the main switch tube to turn on or off, so as to control the second end of the power tube and the first pole of the second capacitor The purpose of connecting or disconnecting between boards.
  • control unit provided by the embodiment of the present invention includes a plurality of main switch tubes
  • the main control module can control the plurality of main switch tubes to be turned on in sequence at regular intervals, thereby avoiding the The connection of the second capacitor instantly extracts more charges from the access capacitor at the second end of the power tube, resulting in a large voltage drop at the second end of the power tube. As shown in FIG.
  • the control unit 400 includes a plurality of the main switch tubes, which are the first main switch tubes MP1 to the first main switch tubes MP1 to N main switch tubes MPn, the width to length ratio of the first main switch tube MP1 is smaller than the width to length ratio of the other main switch tubes, and N is an integer equal to or greater than 2.
  • the main control module 410 is configured to control the first main switch tubes MP1 to MP1 one by one when the control unit 400 controls the connection between the first plate of the second capacitor C2 and the second end of the power tube 200 .
  • the Nth main switch tube MPn is turned on.
  • main control module provided by the embodiment of the present invention controls the conduction of the previous main switch tube, it controls the conduction of the next main switch tube at a predetermined time interval, wherein the present invention does not limit the specific value of the predetermined time. Specific calculation analysis needs to be carried out according to the actual application.
  • the main control module controls the first main switch tube to the Nth main switch tube to conduct one by one, and the width to length ratio of the first main switch tube is It is smaller than the width-length ratio of the other main switch tubes; when the first main switch tube is controlled to be turned on, the on-resistance of the first main switch tube is relatively small due to the small width-length ratio, which can limit the second end of the power tube in this path.
  • the charge extraction speed of the access capacitor is used to avoid a large voltage drop at the second end of the power tube; then the second main switch tube with the smaller width and length is controlled to turn on the Nth main switch, and the first pole of the second capacitor is completed.
  • the whole process of the connection between the board and the second end of the power tube can further reduce the voltage fluctuation at the second end of the power tube by sequentially controlling the conduction of the first main switch tube to the Nth main switch tube.
  • the main control module can control all main switches to turn off at the same time, which is not specifically limited by the present invention.
  • the width to length ratio of the i+1 th main switch tube provided in the embodiment of the present invention is greater than the width to length ratio of the i th main switch tube, and i is an integer equal to or greater than 1 and less than or equal to N-1, so that The total on-resistance of the plurality of parallel main switch tubes is sequentially reduced, so as to ensure that the voltage drop fluctuation of the second end of the power tube is small during the connection process of the second capacitor.
  • FIG. 4 it is a schematic structural diagram of another low-dropout linear regulator provided by an embodiment of the present invention, wherein the control unit 400 provided by an embodiment of the present invention further includes at least one auxiliary switch MN, at least one The current source In and the auxiliary control module 420, the auxiliary switch MN and the current source In are in one-to-one correspondence, the gate of the auxiliary switch MN is electrically connected to the auxiliary control module 420, and the auxiliary switch MN
  • the first end of MN is electrically connected to the second end of the power tube 200, the second end of the auxiliary switch tube MN is electrically connected to one end of the current source In, and the other end of the current source In is connected to the ground terminal GND; wherein
  • the auxiliary control module 420 is configured to control at least one auxiliary switch MN to conduct when the main control module 410 controls the main switch MP to conduct.
  • the main control module 410 and the auxiliary control module 420 may be the same module.
  • control unit provided by the embodiment of the present invention further includes an auxiliary switch tube, a current source and an auxiliary control module.
  • the main control module controls the conduction of the switch tube.
  • the auxiliary control module controls the conduction of the auxiliary switch tube to connect the current source with the second end of the power tube, wherein the current source is equivalent to a fixed load.
  • the main pole at the control end of the tube is separated from the secondary pole at the second end of the power tube, which further improves the loop stability of the low dropout linear regulator in the standby state and improves the performance of the low dropout linear regulator.
  • the auxiliary control module can control all auxiliary switches to be turned off at the same time, which is not specifically limited by the present invention.
  • the number of the auxiliary switch tubes provided in the embodiment of the present invention is the same as the number of the main switch tubes, and the auxiliary control module is configured to control the same number of the main switch tubes when the main control module controls the conduction of the main switch tubes.
  • the auxiliary switch tube is turned on.
  • FIG. 5 the low-dropout linear voltage regulator is shown in FIG. 5, wherein FIG. 5 is a schematic structural diagram of adding an auxiliary switch tube, a current source and an auxiliary control module on the basis of the structure shown in FIG. 3.
  • control unit 400 When the 400 includes a plurality of the main switch tubes, which are the first main switch tube MP1 to the Nth main switch tube MPn, the control unit 400 further includes a plurality of the auxiliary switch tubes, which are the first main switch tube MP1 to the Nth main switch tube MPn respectively.
  • the auxiliary switch tube MN1 to the Nth auxiliary switch tube MNn; the auxiliary control module 420 is configured to control the jth auxiliary switch tube to be turned on when the main control control module 410 controls the jth main switch tube to turn on, and j is equal to or an integer greater than 1 and less than or equal to N.
  • the auxiliary control module simultaneously controls the jth auxiliary switch tube to be turned on, so that Connect the current source electrically connected to the jth auxiliary switch tube with the first electrode plate of the first capacitor, and then control an auxiliary switch tube to be turned on while controlling a main switch tube to be turned on, so as to ensure that the power tube is connected to the second capacitor.
  • the level is synchronized with the number of current sources connected to further avoid the situation of large voltage fluctuations at the second end of the power tube, while ensuring the separation of the main pole at the control end of the power tube and the secondary pole at the second end of the power tube, further improving Low dropout linear regulators improve the performance of low dropout linear regulators with loop stability during standby.
  • the current of the current source electrically connected to the first auxiliary switch provided by the present invention is smaller than the currents of the other current sources, thereby limiting the current of the current source electrically connected to the first auxiliary switch.
  • the current comes from the speed at which the second end of the power tube is connected to the capacitor to extract the charge, which ensures high loop stability.
  • the current of the current source electrically connected to the Nth auxiliary switch provided by the present invention is greater than the current of the other current sources, and the currents connected to the current sources through different auxiliary switches are designed differently to ensure that all current sources are The total current is as expected, ensuring high loop stability.
  • the power transistors provided in the embodiments of the present invention may be P-type transistors
  • the main switch transistors may be P-type transistors
  • the auxiliary switch transistors may be N-type transistors, which are not specifically limited in the present invention.
  • the operational amplifier provided by the present invention may be an OTA (operational transconductance amplifier, transconductance amplifier), which is not specifically limited by the present invention.
  • an embodiment of the present invention further provides an electronic device, where the electronic device includes the low-dropout linear regulator provided by any one of the foregoing embodiments.
  • the electronic device provided by the present invention may be an optical anti-shake lens, etc., and the present invention does not specifically limit the type of the electronic device.
  • Embodiments of the present invention provide a low-dropout linear voltage regulator and electronic equipment, including: an operational amplifier, a power tube, a compensation capacitor, a resistance feedback unit, a control unit, a first capacitor and a second capacitor;
  • the phase terminal is connected to the reference voltage
  • the non-phase terminal of the operational amplifier is electrically connected to the output terminal of the resistance feedback unit
  • the output terminal of the operational amplifier is connected to the first plate of the compensation capacitor and the control of the power tube
  • the first end of the power tube is connected to the power supply voltage
  • the second end of the power tube is connected to the input end of the resistance feedback unit, the second plate of the compensation capacitor, and the first capacitor
  • the first plate of the capacitor is electrically connected to the control unit, the second plate of the first capacitor is electrically connected to the ground terminal;
  • the control unit is electrically connected to the first plate of the second capacitor, and the second plate of the first capacitor is electrically connected to the ground terminal.
  • the second electrode plate of the two capacitors is electrically connected to the
  • the low dropout linear voltage regulator provided by the embodiment of the present invention includes a control unit electrically connected with the second capacitor, and the control unit is used to control the first electrode plate of the second capacitor and the first electrode plate of the first capacitor. Connect or disconnect; thus, when the low dropout linear regulator is in the standby state, the control unit controls the disconnection between the first plate of the second capacitor and the second end of the power tube, so that the second end of the power tube is disconnected.
  • the connection capacitance is small, that is, only the first capacitor is connected, so as to ensure the separation of the main pole at the control end of the power tube and the secondary pole at the second end of the power tube, so that the low dropout linear regulator has high loop stability in the standby state. , which improves the performance of the low dropout linear regulator.

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Abstract

本发明提供了一种低压差线性稳压器及电子设备，本发明提供的低压差线性稳压器包括与第二电容电连接的控制单元，控制单元用于控制第二电容的第一极板和功率管的第二端的连通或断开；由此，在低压差线性稳压器处于待机状态时，控制单元控制第二电容的第一极板和功率管的第二端之间断开，使得功率管的第二端连接电容较小，进而保证功率管控制端处的主极点和功率管第二端处的次极点分离，使得低压差线性稳压器在待机状态时环路稳定性高，提高了低压差线性稳压器的性能。

Description

一种低压差线性稳压器及电子设备
本申请要求于2020年11月18日提交中国专利局、申请号为202011296347.7、发明名称为“一种低压差线性稳压器及电子设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及电源管理技术领域，更为具体地说，涉及一种低压差线性稳压器及电子设备。
背景技术
低压差线性稳压器(LDO，Low Dropout Regulator)是电源管理领域中的一类重要电路，具有输出噪声小、成本低、结构简单、低功耗等优点，广泛应用于电子系统中。随着很多便携式电子系统对电源要求的不断提高，高性能LDO的研究成了电源管理领域的研究热点。
发明内容
有鉴于此，本发明提供了一种低压差线性稳压器及电子设备，有效解决现有技术存在的技术问题，本发明提供的低压差线性稳压器在待机状态时环路稳定性高，提高了低压差线性稳压器的性能。
为实现上述目的，本发明提供的技术方案如下：
一种低压差线性稳压器，包括：运算放大器、功率管、补偿电容、电阻反馈单元、控制单元、第一电容和第二电容；
所述运算放大器的反相端接入基准电压，所述运算放大器的同相端与所述 电阻反馈单元的输出端电连接，所述运算放大器的输出端与所述补偿电容的第一极板和所述功率管的控制端电连接；
所述功率管的第一端接入电源电压，所述功率管的第二端与所述电阻反馈单元的输入端、所述补偿电容的第二极板、所述第一电容的第一极板和所述控制单元电连接，所述第一电容的第二极板与接地端电连接；
所述控制单元与所述第二电容的第一极板电连接，所述第二电容的第二极板与接地端电连接，所述控制单元用于控制所述第二电容的第一极板与所述功率管的第二端的连通或断开。
可选的，所述第二电容的电容量大于所述第一电容的电容量。
可选的，所述控制单元包括至少一个主开关管和主控制模块，所述主开关管的栅极与所述主控制模块电连接，所述主开关管的第一端与所述功率管的第二端电连接，所述主开关管的第二端与所述第二电容的第一极板电连接。
可选的，所述控制单元包括多个所述主开关管，分别为第一主开关管至第N主开关管，所述第一主开关管的宽长比小于其余所述主开关管的宽长比，N为等于或大于2的整数；
所述主控制模块用于逐一控制所述第一主开关管至第N主开关管导通。
可选的，第i+1主开关管的宽长比大于第i主开关管的宽长比，i为等于或大于1且小于或等于N-1的整数。
可选的，所述控制单元还包括至少一个辅助开关管、至少一个电流源和辅助控制模块，所述辅助开关管和所述电流源一一对应，所述辅助开关管的栅极与所述辅助控制模块电连接，所述辅助开关管的第一端与所述功率管的第二端电连接，所述辅助开关管的第二端与所述电流源的一端电连接，且所述电流源 的另一端连接接地端；
其中所述辅助控制模块用于在所述主控制模块控制所述主开关管导通时，控制至少一个所述辅助开关管导通。
可选的，所述辅助开关管的数量与所述主开关管的数量相同，且所述辅助控制模块用于在所述主控制模块控制所述主开关管导通时，控制相同数量的辅助开关管导通。
可选的，在所述控制单元包括多个所述主开关管，分别为所述第一主开关管至所述第N主开关管时，所述控制单元还包括多个所述辅助开关管为第一辅助开关管至第N辅助开关管；
所述辅助控制模块用于在所述主控制模块控制第j主开关管导通时，控制第j辅助开关管导通，j为等于或大于1且小于或等于N的整数。
可选的，与所述第一辅助开关管电连接的电流源的电流，小于其余所述电流源的电流。
可选的，与所述第N辅助开关管电连接的电流源的电流，大于其余所述电流源的电流。
相应的，本发明还提供了一种电子设备，所述电子设备包括上述的低压差线性稳压器。
相较于现有技术，本发明提供的技术方案至少具有以下优点：
本发明提供了一种低压差线性稳压器及电子设备，包括：运算放大器、功率管、补偿电容、电阻反馈单元、控制单元、第一电容和第二电容；所述运算放大器的反相端接入基准电压，所述运算放大器的同相端与所述电阻反馈单元的输出端电连接，所述运算放大器的输出端与所述补偿电容的第一极板和所述 功率管的控制端电连接；所述功率管的第一端接入电源电压，所述功率管的第二端与所述电阻反馈单元的输入端、所述补偿电容的第二极板、所述第一电容的第一极板和所述控制单元电连接，所述第一电容的第二极板与接地端电连接；所述控制单元与所述第二电容的第一极板电连接，所述第二电容的第二极板与接地端电连接，所述控制单元用于控制所述第二电容的第一极板与所述功率管的第二端的连通或断开。
由上述内容可知，本发明提供的低压差线性稳压器包括与第二电容电连接的控制单元，控制单元用于控制第二电容的第一极板和功率管的第二端的连通或断开；由此，在低压差线性稳压器处于待机状态时，控制单元控制第二电容的第一极板和功率管的第二端之间断开，使得功率管的第二端连接电容较小，进而保证功率管控制端处的主极点和功率管第二端处的次极点分离，使得低压差线性稳压器在待机状态时环路稳定性高，提高了低压差线性稳压器的性能。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据提供的附图获得其他的附图。
图1为本发明实施例所提供的一种低压差线性稳压器的结构示意图；
图2为本发明实施例所提供的另一种低压差线性稳压器的结构示意图；
图3为本发明实施例所提供的又一种低压差线性稳压器的结构示意图；
图4为本发明实施例所提供的又一种低压差线性稳压器的结构示意图；
图5为本发明实施例所提供的又一种低压差线性稳压器的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
正如背景技术所述，低压差线性稳压器(LDO，Low Dropout Regulator)是电源管理领域中的一类重要电路，具有输出噪声小、成本低、结构简单、低功耗等优点，广泛应用于电子系统中。随着很多便携式电子系统对电源要求的不断提高，高性能LDO的研究成了电源管理领域的研究热点。
基于此，本发明实施例提供了一种低压差线性稳压器及电子设备，有效解决现有技术存在的技术问题，本发明实施例提供的低压差线性稳压器在待机状态时环路稳定性高，提高了低压差线性稳压器的性能。
为实现上述目的，本发明实施例提供的技术方案如下，具体结合图1至图5对本发明实施例提供的技术方案进行详细的描述。
参考图1所示，为本发明实施例所提供的一种低压差线性稳压器的结构示意图，其中，低压差线性稳压器包括：
运算放大器100、功率管200、补偿电容Cc、电阻反馈单元300、控制单元400、第一电容C1和第二电容C2。
所述运算放大器100的反相端接入基准电压VBG，所述运算放大器100的同相端与所述电阻反馈单元300的输出端电连接，所述运算放大器100的输 出端与所述补偿电容Cc的第一极板和所述功率管200的控制端例如栅极电连接。
所述功率管200的第一端接入电源电压VDD，所述功率管200的第二端与所述电阻反馈单元300的输入端、所述补偿电容Cc的第二极板、所述第一电容C1的第一极板和所述控制单元400电连接，所述第一电容C1的第二极板与接地端GND电连接。
所述控制单元400与所述第二电容C2的第一极板电连接，所述第二电容C2的第二极板与接地端GND电连接，所述控制单元400用于控制所述第二电容C2的第一极板与功率管200的第二端的连通或断开。
可选的，本发明实施例提供的电阻反馈单元300包括串联的第一电阻R1和第二电阻R2，第一电阻R1和第二电阻R2组成分压电路。其中第一电阻R1的第一端与功率管200的第二端(即低压差线性稳压器的输出端)相连，且第二电阻R2的第二端与接地端GND相连，及第一电阻R1的第二端和第二电阻R2的第一端与运算放大器100的同相端相连。
本发明实施例所提供的电阻反馈单元用于采集功率管输出的电压，进而将功率管输出的电压传输至运算放大器，运算放大器根据电阻反馈单元输出的电压与基准电压对功率管进行控制。其中本发明实施例提供的补偿电容用于进行MILLER补偿，进一步提高环路的稳定性。
可以理解的，本发明实施例提供的低压差线性稳压器，包括与第二电容电连接的控制单元，控制单元用于控制第二电容的第一极板和功率管的第二端的连通或断开；由此，在低压差线性稳压器处于待机状态时，控制单元控制第二电容的第一极板和功率管的第二端之间断开，使得功率管的第二端连接电容较 小即仅仅连接有第一电容，进而保证功率管控制端处的主极点和功率管第二端处的次极点分离，使得低压差线性稳压器在待机状态时环路稳定性高，提高了低压差线性稳压器的性能。
在本发明一实施例中，本发明所提供的所述第二电容的电容量大于所述第一电容的电容量，进而能够在低压差线性稳压器处于待机状态时，保证功率管的第二端连接的电容更小，进一步提高低压差线性稳压器在待机状态时环路稳定性。
如图2所示，为本发明实施例提供的另一种低压差线性稳压器的结构示意图，其中，本发明实施例提供的所述控制单元400包括至少一个主开关管MP和主控制模块410，所述主开关管MP的栅极与所述主控制模块410电连接，所述主开关管MP的第一端与功率管200的第二端电连接，所述主开关管MP的第二端与所述第二电容C2的第一极板电连接。
可以理解的，本发明实施例提供的控制单元为了实现控制功率管的第二端和第二电容的第一极板之间的连通或断开，可以将控制单元设置包括有至少一个主开关管和主控制模块的方式，其中通过主控制模块为主开关管提供开启或关断信号，而控制主开关管导通或关断，达到控制功率管的第二端和第二电容的第一极板之间连通或断开的目的。
本发明实施例提供的控制单元包括多个主开关管时，且在低压差线性稳压器处于工作状态时，主控制模块可以控制多个主开关管每隔一定时间依次导通，进而避免由于第二电容的接入而瞬间从功率管的第二端接入电容中抽取较多电荷，而导致功率管的第二端处电压产生较大压降的情况出现。如图3所示， 为本发明实施例提供的又一种低压差线性稳压器的结构示意图，其中，所述控制单元400包括多个所述主开关管为第一主开关管MP1至第N主开关管MPn，所述第一主开关管MP1的宽长比小于其余所述主开关管的宽长比，N为等于或大于2的整数。所述主控制模块410用于在所述控制单元400控制所述第二电容C2的第一极板与所述功率管200的第二端的连通时，逐一控制所述第一主开关管MP1至第N主开关管MPn导通。
需要说明的是，本发明实施例提供的主控制模块控制前一主开关管导通后，间隔预定时间控制下一主开关管导通，其中本发明对于预定时间的具体数值不做限制，其需要根据实际应用进行具体计算分析。
可以理解的，本发明实施例提供的低压差线性稳压器处于工作状态时，主控制模块逐一控制第一主开关管至第N主开关管导通，且第一主开关管的宽长比小于其余主开关管的宽长比；首先控制第一主开关管导通时，由于第一主开关管的宽长比较小而导通电阻较大，进而能够限制该路径功率管的第二端接入电容的电荷抽取速度，避免功率管的第二端出现较大压降；而后依次控制宽长比较小的第二主开关管至第N主开关导通，完成第二电容的第一极板和功率管的第二端连通的整个过程，进而能够通过依次控制第一主开关管至第N主开关管导通，减小功率管的第二端处电压波动情况。以及，本发明实施例提供的低压差线性稳压器处于待机状态或工作状态时，主控制模块可以控制所有主开关管同时关断，对此本发明不做具体限制。
进一步的，本发明实施例提供的第i+1主开关管的宽长比大于第i主开关管的宽长比，i为等于或大于1且小于或等于N-1的整数，由此能够依次减小多个并联主开关管的总导通电阻，保证第二电容连通过程中功率管的第二端的 压降波动较小。
如图4所示，为本发明实施例提供的又一种低压差线性稳压器的结构示意图，其中，本发明实施例提供的所述控制单元400还包括至少一个辅助开关管MN、至少一个电流源In和辅助控制模块420，所述辅助开关管MN和所述电流源In一一对应，所述辅助开关管MN的栅极与所述辅助控制模块420电连接，所述辅助开关管MN的第一端与所述功率管200的第二端电连接，所述辅助开关管MN的第二端与所述电流源In的一端电连接，电流源In的另一端连接接地端GND；其中所述辅助控制模块420用于在所述主控制模块410控制所述主开关管MP导通时，控制至少一个辅助开关管MN导通。在具体实现时，主控制模块410和辅助控制模块420可以是同一个模块。
可以理解的，本发明实施例提供的控制单元还包括有辅助开关管、电流源和辅助控制模块，在低压差线性稳压器处于工作状态时，及在主控制模块控制住开关管导通的同时，辅助控制模块控制辅助开关管导通，以将电流源与功率管的第二端连通，其中电流源相当于固定负载，通过将电流源接入功率管的第二端的方式，能够保证功率管控制端处的主极点和功率管第二端处的次极点分离，进一步提高低压差线性稳压器在待机状态时环路稳定性，提高了低压差线性稳压器的性能。以及，本发明实施例提供的低压差线性稳压器处于待机状态或工作状态时，辅助控制模块可以控制所有辅助开关管同时关断，对此本发明不做具体限制。
本发明实施例提供的所述辅助开关管的数量与所述主开关管的数量相同，且所述辅助控制模块用于在所述主控制模块控制所述主开关管导通时，控制相 同数量的辅助开关管导通。具体如图5所示低压差线性稳压器，其中图5为图3所示结构基础上增加辅助开关管、电流源和辅助控制模块的结构示意图，本发明实施例提供的在所述控制单元400包括多个所述主开关管，分别为所述第一主开关管MP1至所述第N主开关管MPn时，所述控制单元400还包括多个所述辅助开关管，分别为第一辅助开关管MN1至第N辅助开关管MNn；所述辅助控制模块420用于在所述主控制控制模块410控制第j主开关管导通时，控制第j辅助开关管导通，j为等于或大于1且小于或等于N的整数。
可以理解的，本发明实施例提供的低压差线性稳压器处于工作状态时，且在主控制模块控制第j主开关管导通时，辅助控制模块同时控制第j辅助开关管导通，以将第j辅助开关管电连接的电流源与第一电容的第一极板连通，进而在控制一主开关管导通同时，控制一辅助开关管导通，保证功率管接入第二电容的程度与电流源接入数量同步进行，进一步避免出现功率管的第二端的电压波动较大的情况，同时保证功率管控制端处的主极点和功率管第二端处的次极点分离，进一步提高低压差线性稳压器在待机状态时环路稳定性，提高了低压差线性稳压器的性能。
在本发明一实施例中，本发明所提供的与所述第一辅助开关管电连接的电流源的电流，小于其余所述电流源的电流，进而能够限制与第一辅助开关管电连接的电流源自功率管的第二端接入电容中抽取电荷的速度，保证环路稳定性高。以及，本发明所提供的与所述第N辅助开关管电连接的电流源的电流，大于其余所述电流源的电流，进而通过不同辅助开关管连接电流源的电流不同设计，保证所有电流源的总电流符合预期，保证环路稳定性高。
需要说明的是，本发明实施例所提供的功率管可以为P型晶体管，主开关 管可以为P型晶体管，而辅助开关管可以为N型晶体管，对此本发明不做具体限制。
在本发明一实施例中，本发明所提供的运算放大器可以为OTA(operational transconductance amplifier，跨导放大器)，对此本发明不做具体限制。
相应的，本发明实施例还提供了一种电子设备，所述电子设备包括上述任意一实施例所提供的低压差线性稳压器。
在本发明一实施例中，本发明所提供的电子设备可以为光学防抖镜头等，对此电子设备类型本发明不做具体限制。
本发明实施例提供了一种低压差线性稳压器及电子设备，包括：运算放大器、功率管、补偿电容、电阻反馈单元、控制单元、第一电容和第二电容；所述运算放大器的反相端接入基准电压，所述运算放大器的同相端与所述电阻反馈单元的输出端电连接，所述运算放大器的输出端与所述补偿电容的第一极板和所述功率管的控制端电连接；所述功率管的第一端接入电源电压，所述功率管的第二端与所述电阻反馈单元的输入端、所述补偿电容的第二极板、所述第一电容的第一极板和所述控制单元电连接，所述第一电容的第二极板与接地端电连接；所述控制单元与所述第二电容的第一极板电连接，所述第二电容的第二极板与接地端电连接，所述控制单元用于控制所述第二电容的第一极板与所述功率管的第二端的连通或断开。
由上述内容可知，本发明实施例提供的低压差线性稳压器包括与第二电容电连接的控制单元，控制单元用于控制第二电容的第一极板和第一电容的第一极板的连通或断开；由此，在低压差线性稳压器处于待机状态时，控制单元控 制第二电容的第一极板和功率管的第二端之间断开，使得功率管的第二端连接电容较小即仅仅连接有第一电容，进而保证功率管控制端处的主极点和功率管第二端处的次极点分离，使得低压差线性稳压器在待机状态时环路稳定性高，提高了低压差线性稳压器的性能。
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。

Claims (11)

  1. 一种低压差线性稳压器，其特征在于，包括：运算放大器、功率管、补偿电容、电阻反馈单元、控制单元、第一电容和第二电容；
    所述运算放大器的反相端接入基准电压，所述运算放大器的同相端与所述电阻反馈单元的输出端电连接，所述运算放大器的输出端与所述补偿电容的第一极板和所述功率管的控制端电连接；
    所述功率管的第一端接入电源电压，所述功率管的第二端与所述电阻反馈单元的输入端、所述补偿电容的第二极板、所述第一电容的第一极板和所述控制单元电连接，所述第一电容的第二极板与接地端电连接；
    所述控制单元与所述第二电容的第一极板电连接，所述第二电容的第二极板与接地端电连接，所述控制单元用于控制所述第二电容的第一极板与所述功率管的第二端的连通或断开。
  2. 根据权利要求1所述的低压差线性稳压器，其特征在于，所述第二电容的电容量大于所述第一电容的电容量。
  3. 根据权利要求1所述的低压差线性稳压器，其特征在于，所述控制单元包括至少一个主开关管和主控制模块，所述主开关管的栅极与所述主控制模块电连接，所述主开关管的第一端与所述功率管的第二端电连接，所述主开关管的第二端与所述第二电容的第一极板电连接。
  4. 根据权利要求3所述的低压差线性稳压器，其特征在于，所述控制单元包括多个所述主开关管，分别为第一主开关管至第N主开关管，所述第一主开关管的宽长比小于其余所述主开关管的宽长比，N为等于或大于2的整数；
    所述主控制模块用于逐一控制所述第一主开关管至第N主开关管导通。
  5. 根据权利要求4所述的低压差线性稳压器，其特征在于，第i+1主开关管的宽长比大于第i主开关管的宽长比，i为等于或大于1且小于或等于N-1的整数。
  6. 根据权利要求3-5任意一项所述的低压差线性稳压器，其特征在于，所述控制单元还包括至少一个辅助开关管、至少一个电流源和辅助控制模块，所述辅助开关管和所述电流源一一对应，所述辅助开关管的栅极与所述辅助控制模块电连接，所述辅助开关管的第一端与所述功率管的第二端电连接，所述辅助开关管的第二端与所述电流源的一端电连接，且所述电流源的另一端连接接地端；
    其中所述辅助控制模块用于在所述主控制模块控制所述主开关管导通时，控制至少一个所述辅助开关管导通。
  7. 根据权利要求6所述的低压差线性稳压器，其特征在于，所述辅助开关管的数量与所述主开关管的数量相同，且所述辅助控制模块用于在所述主控制模块控制所述主开关管导通时，控制相同数量的辅助开关管导通。
  8. 根据权利要求7所述的低压差线性稳压器，其特征在于，在所述控制单元包括多个所述主开关管，分别为所述第一主开关管至所述第N主开关管时，所述控制单元还包括多个所述辅助开关管为第一辅助开关管至第N辅助开关管；
    所述辅助控制模块用于在所述主控制模块控制第j主开关管导通时，控制第j辅助开关管导通，j为等于或大于1且小于或等于N的整数。
  9. 根据权利要求8所述的低压差线性稳压器，其特征在于，与所述第一 辅助开关管电连接的电流源的电流，小于其余所述电流源的电流。
  10. 根据权利要求9所述的低压差线性稳压器，其特征在于，与所述第N辅助开关管电连接的电流源的电流，大于其余所述电流源的电流。
  11. 一种电子设备，其特征在于，所述电子设备包括权利要求1-10任意一项所述的低压差线性稳压器。
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