CN115525087B - Quick response low dropout linear voltage regulator - Google Patents
Quick response low dropout linear voltage regulator Download PDFInfo
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- CN115525087B CN115525087B CN202210320088.XA CN202210320088A CN115525087B CN 115525087 B CN115525087 B CN 115525087B CN 202210320088 A CN202210320088 A CN 202210320088A CN 115525087 B CN115525087 B CN 115525087B
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to a quick response low dropout linear voltage regulator, which comprises an operational amplifier, a buffer, an adjusting tube, a feedback resistor group, a miller capacitor and a transient enhancement circuit, wherein the miller capacitor is arranged between an inverting end and an output end of the operational amplifier; the transient enhancement circuit comprises a transient lifting circuit and a transient pull-down circuit. The invention provides corresponding transient enhancement modes aiming at different output states of the low-dropout voltage regulator, effectively stabilizes the voltage and achieves the aim of quick response; meanwhile, the integrated level of the circuit is high, the circuit structure is simple, and the power consumption is further reduced.
Description
Technical Field
The invention relates to the technical field of LDO (Low Dropout Regulator), in particular to a quick-response low-dropout linear voltage regulator.
Background
LDOs are linear regulators that use transistors or Field Effect Transistors (FETs) operating in their saturation region to subtract excess voltage from the applied input voltage to produce a regulated output voltage. As the LDO circuit adopts PMOS as an output adjusting tube, and one-stage common source inverting amplification is added, the LDO circuit has higher output impedance, so that the position of an output pole can be changed along with load, the stability of the LDO circuit is not high, and the LDO is a closed-loop system, and the stability is not high, so that the output voltage can be directly caused to oscillate and cannot be used.
In order to achieve the purpose of fast response and voltage stabilization, the conventional LDO often has complex circuit structural design or cannot be accurately regulated, so that the output voltage still oscillates, or the integration level is low, and the power consumption is larger.
Disclosure of Invention
In order to solve the problems, the invention provides a quick response low dropout linear voltage regulator, which provides a targeted solving circuit structure for the oscillation condition of output voltage by sampling the voltage of an output side, for example, when the output voltage is too high, the output voltage is pulled down, and when the output voltage is too low, the output voltage is lifted, and meanwhile, the circuit structure is simple in design, high in integration level and low in power consumption.
The invention relates to a quick response low dropout linear voltage regulator, which comprises an operational amplifier, a buffer, an adjusting tube, a feedback resistor group, a miller capacitor and a transient enhancement circuit, wherein the miller capacitor is arranged between the input end of the buffer and the output end of the voltage regulator; the transient enhancement circuit comprises a transient lifting circuit and a transient pull-down circuit.
Further, the transient enhancement circuit further comprises a non-action circuit.
Further, the transient boost circuit includes: one end of the first current source is coupled with the power supply, the other end of the first current source is coupled with the first MOS tube and the second MOS tube, the first MOS tube and the third MOS tube are coupled and then grounded, and the second MOS tube and the fourth MOS tube are coupled and then grounded; the grid electrode of the first MOS tube is connected with sampling voltage; the grid electrode of the third MOS tube is coupled with the grid electrode of the fourth MOS tube and is coupled with the source electrode of the first MOS tube; one end of the second current source is coupled with the power supply, the second triode and the fifth triode, and the other end of the second current source is coupled with the first triode; the first triode is coupled with the third triode and then grounded, and the second triode is coupled with the fourth triode and then grounded; the base electrode of the second triode is coupled with the base electrode of the fifth triode and is connected with the emitter electrode of the fifth triode; the emitter of the fifth triode outputs a transient boost signal through a resistor, and the transient boost signal is provided for the adjusting tube.
Further, the transient pull-down circuit includes: the third current source is connected with the power supply at one end, the fifth MOS tube and the seventh MOS tube are connected with the ground after being connected with the fifth MOS tube and the sixth MOS tube, and the sixth MOS tube is connected with the ground after being connected with the eighth MOS tube; the grid electrode of the fifth MOS tube is connected with sampling voltage; the grid electrode of the seventh MOS tube is coupled with the grid electrode of the eighth MOS tube and is coupled with the source electrode of the fifth MOS tube; one end of the fourth current source is coupled with the power supply, the other end of the fourth current source is connected with the first resistor and the second resistor, the first resistor is coupled with the fifth triode and then grounded, and the second resistor is coupled with the sixth triode and then grounded; the base electrode of the fifth triode is coupled with the grid electrode of the sixth MOS tube and is coupled with the source electrode of the sixth MOS tube; the base electrode of the sixth triode is connected with a reference voltage, and the common end of the second resistor and the collector electrode of the sixth triode outputs a transient pull-down signal which is provided for the adjusting tube.
Further, the low dropout linear voltage regulator further comprises a load capacitor and a load resistor, wherein the load capacitor and the load resistor are connected in parallel to two ends of the feedback resistor group and grounded.
Further, the non-action circuit is a normally open switch circuit.
Further, when the output voltage of the low dropout linear voltage regulator is too high, the transient pull-down circuit enables the gate-source voltage of the adjusting tube to be reduced, and output overshoot is reduced.
Further, when the output voltage of the low dropout linear voltage regulator is too low, the transient lifting circuit enables the grid source voltage of the adjusting tube to rise, and the output voltage drop is reduced.
Further, the transient enhancement circuit is connected with a reference voltage and an input voltage, wherein the reference voltage and the input voltage of the inverting terminal of the operational amplifier are the same reference voltage.
Further, the transient enhancement circuit does not include a dead circuit
The invention has the following technical effects:
1. the transient lifting circuit and the transient pull-down circuit respectively aim at the conditions of voltage reduction and overshoot of the output voltage of the voltage stabilizer, so that the gate-source voltage of the adjusting tube is reduced or increased, and the influence caused by output oscillation is reduced rapidly.
2. The miller capacitance is not directly coupled with the grid electrode of the adjusting tube, but is isolated by the buffer, so that the stability of the circuit output is further improved.
Drawings
FIG. 1 is a circuit diagram of a fast response low dropout linear regulator of the present invention;
FIG. 2 is a schematic diagram of a transient boost circuit of the fast response low dropout linear regulator of the present invention;
FIG. 3 is a schematic diagram of a transient pull-down circuit of a fast response LDO of the present invention.
Detailed Description
Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the listed items.
It will be understood that when an element such as a layer, region or substrate is referred to as being "on" or extending "over" another element, it can be directly on or extend directly onto the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly extending onto" another element, there are no intervening elements present. It will also be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.
Relative terms such as "below" or "above," "above" or "below" or "horizontal" or "vertical" may be used herein to describe a conduit of one element, layer or region with another element, layer or region. As shown, it will be understood that these terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the field of phase management and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The present invention is described below with reference to flowchart illustrations and/or block diagrams of methods, systems, and computer program products according to embodiments of the invention. It will be understood that some blocks of the flowchart illustrations and/or block diagrams, and combinations of some blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be stored or implemented in a microcontroller, microprocessor, digital Signal Processor (DSP), field Programmable Gate Array (FPGA), state machine, programmable Logic Controller (PLC) or other processing circuit, general purpose computer, special purpose computer. The use computer or other programmable data processing apparatus (e.g., a production machine) to create means or block diagrams for implementing the functions/acts specified in the flowchart and/or block diagrams by the instructions being executed by the processor of the computer or other programmable data processing apparatus.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means. The functions/acts specified in the flowchart and/or block diagram block or blocks are implemented.
The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus. Other programmable devices provide steps for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. It should be understood that the functions/acts noted in the blocks may occur out of the order noted in the operational illustrations. For example, two blocks shown in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality/acts involved. Although some of the figures include arrows on the communication paths to illustrate the primary direction of communication, it should be understood that communication may occur in a direction opposite to the depicted arrows.
The specific implementation process of the invention is as follows:
as shown in fig. 1, the present invention relates to a fast response low dropout linear voltage regulator, which comprises an operational amplifier, a buffer, an adjusting tube, a feedback resistor group, a miller capacitor and a transient enhancement circuit, wherein the miller capacitor is arranged between an input end of the buffer and an output end of the voltage regulator, the buffer is arranged between the output end of the operational amplifier and a grid electrode of the adjusting tube, an intermediate node of the feedback resistor group is coupled with an in-phase end of the operational amplifier, and the transient enhancement circuit is arranged between the grid electrode of the adjusting tube and the output end of the voltage regulator; the transient enhancement circuit comprises a transient lifting circuit and a transient pull-down circuit.
Preferably, the transient enhancement circuit further comprises a non-action circuit.
Preferably, as shown in fig. 2, the transient boost circuit includes: a first current source I1, which is 1 One end of (2) is connected with a power supply V CC The other end of the first MOS tube is coupled with the first MOS tube M1 and the second MOS tube M2, the first MOS tube M1 and the third MOS tube M2 are coupled and then grounded, and the second MOS tube M2 and the fourth MOS tube M4 are coupled and then grounded; the grid electrode of the first MOS tube M1 is connected with a sampling voltage S; the grid electrode of the third MOS tube M3 and the grid electrode of the fourth MOS tube M4 are coupled and connected with the source electrode(s) of the first MOS tube M1; second current source I 2 The second current source I 2 One end is connected with a power supply V CC The second triode J2 and the fifth triode J5 are coupled, and the other end of the second triode is coupled with the first triode J1; the first triode J1 is coupled with the third triode J3 and then grounded, and the second triode J2 is coupled with the fourth triode J4 and then grounded; the base electrode of the second triode J2 is coupled with the base electrode (b) of the fifth triode J5 and is connected with the emitter electrode (e) of the fifth triode J5; the emitter electrode (e) of the fifth triode J5 passes through a resistor R P1 A transient boost signal is output which is provided to the regulator tube MP.
Preferably, as shown in fig. 3, the transient pull-down circuit includes: third current source I 3 The third current source I 3 One end is connected with a power supply V CC The other end of the MOS transistor is coupled with a fifth MOS transistor M5 and a sixth MOS transistor M6, the fifth MOS transistor M5 and a seventh MOS transistor M7 are coupled and then grounded, and the sixth MOS transistor M6 and an eighth MOS transistor M8 are coupled and then grounded; the grid electrode (g) of the fifth MOS tube M5 is connected with the sampling voltage S; the grid electrode (g) of the seventh MOS tube M7 and the grid electrode (g) of the eighth MOS tube M8 are coupled and coupled with the source electrode(s) of the fifth MOS tube M5; fourth current source I 4 The fourth current source I 4 One end of (2) is connected with a power supply V CC Coupled with the other end of the first resistor R 1 And a second resistor R 2 Connected with the first resistor R 1 Is coupled to the fifth transistor J5 and grounded, the second resistor R 2 Coupled with the sixth triode J6 and grounded; the base electrode (b) of the fifth triode J5 is coupled with the grid electrode (g) of the sixth MOS tube M6 and is coupled with the source electrode(s) of the sixth MOS tube J6; the base electrode (b) of the sixth triode J6 is connected with a reference voltage V B The second resistor R 2 And the common terminal of the collector (c) of the sixth transistor J6 outputs a transient pull-down signal, which is supplied to the regulator MP.
Preferably, the low dropout linear regulator further comprises a load capacitor C L And a load resistor R L The load capacitance C L And a load resistor R L Parallel to the feedback resistor group (R) f1 And R is f2 ) Both ends are grounded.
Preferably, the non-action circuit is a normally open switch circuit.
Preferably, when the output voltage of the low dropout linear regulator is too high, the transient pull-down circuit reduces the gate-source voltage of the adjusting tube, and reduces the output overshoot.
Preferably, when the output voltage of the low dropout linear regulator is too low, the transient lifting circuit enables the gate-source voltage of the adjusting tube to rise, and reduces the output voltage drop.
Preferably, the transient enhancement circuit is connected to a reference voltage and an input voltage, and the reference voltage and the input voltage of the inverting terminal of the operational amplifier are the same reference voltage.
Preferably, the transient enhancement circuit does not include a dead circuit.
In summary, the transient enhancement circuit is arranged in the low dropout linear voltage regulator with quick response, and when the output voltage of the low dropout linear voltage regulator is too high, the transient pull-down circuit reduces the gate-source voltage of the adjusting tube, so that the output overshoot is reduced; when the output voltage of the low dropout linear voltage regulator is too low, the transient lifting circuit enables the grid source voltage of the adjusting tube to rise, and reduces the output voltage drop, so that the oscillation output by the low dropout linear voltage regulator is responded quickly, and the miller capacitance is connected with the grid electrode of the adjusting tube after being isolated by the buffer, so that the stability of the output of the circuit is further improved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and those skilled in the art, after reading the present application, may make various modifications or alterations to the present invention with reference to the above embodiments, all falling within the scope of the appended claims.
Claims (6)
1. A fast response low dropout linear regulator is characterized in that,
the device comprises an operational amplifier, a buffer, an adjusting tube, a feedback resistor group, a miller capacitance and a transient enhancement circuit, wherein the miller capacitance is arranged between the input end of the buffer and the output end of a voltage stabilizer, the buffer is arranged between the output end of the operational amplifier and the grid electrode of the adjusting tube, the middle node of the feedback resistor group is coupled with the same-phase end of the operational amplifier, and the transient enhancement circuit is arranged between the grid electrode of the adjusting tube and the output end of the voltage stabilizer; the transient enhancement circuit comprises a transient boost circuit and a transient pull-down circuit;
the transient lifting circuit comprises a first current source, one end of the first current source is coupled with a power supply, the other end of the first current source is coupled with a first MOS tube and a second MOS tube, the first MOS tube and a third MOS tube are coupled and then grounded, and the second MOS tube and a fourth MOS tube are coupled and then grounded;
the grid electrode of the first MOS tube is connected with sampling voltage;
the grid electrode of the third MOS tube is coupled with the grid electrode of the fourth MOS tube and is coupled with the source electrode of the first MOS tube; one end of the second current source is coupled with the power supply, the second triode and the fifth triode, and the other end of the second current source is coupled with the first triode; the first triode is coupled with the third triode and then grounded, and the base electrodes of the third triode and the fourth triode are coupled with the emitter electrode of the second triode and the collector electrode of the fourth triode; the second triode is coupled with the fourth triode and then grounded; the base electrode of the second triode is coupled with the base electrode of the fifth triode and is connected with the emitter electrode of the fifth triode; the emitter of the fifth triode outputs a transient lifting signal through a resistor, and the transient lifting signal is provided for the adjusting tube;
the transient pull-down circuit comprises a third current source, one end of the third current source is coupled with a power supply, the other end of the third current source is coupled with a fifth MOS tube and a sixth MOS tube, the fifth MOS tube and the seventh MOS tube are coupled and then grounded, and the sixth MOS tube and the eighth MOS tube are coupled and then grounded; the grid electrode of the fifth MOS tube is connected with sampling voltage;
the grid electrode of the seventh MOS tube is coupled with the grid electrode of the eighth MOS tube and is coupled with the source electrode of the fifth MOS tube;
one end of the fourth current source is coupled with the power supply, the other end of the fourth current source is connected with the first resistor and the second resistor, the first resistor is coupled with the fifth triode and then grounded, and the second resistor is coupled with the sixth triode and then grounded;
the base electrode of the fifth triode is coupled with the grid electrode of the sixth MOS tube and is coupled with the source electrode of the sixth MOS tube; the base electrode of the sixth triode is connected with a reference voltage, and the common end of the second resistor and the collector electrode of the sixth triode outputs a transient pull-down signal which is provided for the adjusting tube.
2. The fast response low dropout linear regulator according to claim 1, wherein,
the transient enhancement circuit further includes a non-action circuit.
3. The rapid response low dropout linear regulator according to any one of claims 1 to 2, wherein,
the low dropout linear voltage regulator further comprises a load capacitor and a load resistor, wherein the load capacitor and the load resistor are connected in parallel to two ends of the feedback resistor group and grounded.
4. The fast response low dropout linear regulator according to claim 2, wherein,
the non-action circuit is a normally open switch circuit.
5. The fast response low dropout linear regulator according to claim 1, wherein,
when the output voltage of the low dropout linear voltage regulator is too high, the transient pull-down circuit enables the gate-source voltage of the adjusting tube to be reduced, and output overshoot is reduced.
6. The fast response low dropout linear regulator according to claim 1, wherein,
when the output voltage of the low dropout linear voltage regulator is too low, the transient lifting circuit enables the grid source voltage of the adjusting tube to rise, and output undershoot is reduced.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210320088.XA CN115525087B (en) | 2022-03-29 | 2022-03-29 | Quick response low dropout linear voltage regulator |
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| CN202210320088.XA CN115525087B (en) | 2022-03-29 | 2022-03-29 | Quick response low dropout linear voltage regulator |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103744462A (en) * | 2013-10-22 | 2014-04-23 | 中山大学 | Low-power-consumption transient-response enhanced low-dropout linear regulator and regulating method thereof |
| CN105116955A (en) * | 2015-10-09 | 2015-12-02 | 东南大学 | Transient enhancement circuit applied to full-integration LDO |
| CN111857230A (en) * | 2020-08-11 | 2020-10-30 | 上海艾为电子技术股份有限公司 | Linear regulator and electronic device |
| WO2022041011A1 (en) * | 2020-08-26 | 2022-03-03 | 华为技术有限公司 | Transient boost circuit for ldo, chip system and device |
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- 2022-03-29 CN CN202210320088.XA patent/CN115525087B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103744462A (en) * | 2013-10-22 | 2014-04-23 | 中山大学 | Low-power-consumption transient-response enhanced low-dropout linear regulator and regulating method thereof |
| CN105116955A (en) * | 2015-10-09 | 2015-12-02 | 东南大学 | Transient enhancement circuit applied to full-integration LDO |
| CN111857230A (en) * | 2020-08-11 | 2020-10-30 | 上海艾为电子技术股份有限公司 | Linear regulator and electronic device |
| WO2022041011A1 (en) * | 2020-08-26 | 2022-03-03 | 华为技术有限公司 | Transient boost circuit for ldo, chip system and device |
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