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Low dropout voltage regulator

A low-dropout voltage regulator, low-dropout voltage regulator technology, used in instruments, regulating electrical variables, control/regulating systems, etc. Low and other problems, to achieve the effect of improving bandwidth and stability, and improving load transient response speed

Active Publication Date: 2020-09-15
SHANGHAI ANLOGIC INFOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

but if figure 2 The output impedance of the super voltage follower added to the circuit shown is still very high, resulting in a low frequency of the pole of this node, and the overall load transient response of the low dropout voltage regulator is still slow

Method used

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Embodiment Construction

[0023] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by those skilled in the art to which the present invention belongs. As used herein, "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other el...

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Abstract

The invention provides a low dropout voltage regulator. The low dropout voltage regulator comprises a low dropout voltage regulator circuit and a flip voltage follower circuit. The low dropout voltageregulator circuit comprises an error amplifier, a first MOS transistor and a feedback circuit. The error amplifier is connected with the flip voltage follower circuit, the flip voltage follower circuit is connected with an output power device, the output power device is connected with the feedback circuit, and the feedback circuit is connected with the error amplifier. The low dropout voltage regulator comprises the low dropout voltage regulator circuit and the flip voltage follower circuit, the load transient response speed of the low dropout voltage regulator can be increased through the flip voltage follower circuit, and the bandwidth and stability of the low dropout voltage regulator can be improved.

Description

technical field [0001] The invention relates to the technical field of voltage regulators, in particular to a low-dropout voltage regulator. Background technique [0002] Low Dropout Regulator (LDO) has become an important basic module of power management in System-on-a-chip (SOC), and its performance indicators such as efficiency, standby power consumption, output current , Load transient response requirements are becoming more and more stringent. Among them, excellent load transient response, small overshoot and undershoot are very critical to prevent unexpected downtime of the system. [0003] Such as figure 1 As shown, on the one hand, the design of the low dropout voltage regulator usually requires the error amplifier to have a high DC gain, so as to ensure the accuracy of the output voltage, the power supply ripple rejection ratio and other indicators, which also means that the error amplifier usually adopts an operational cross-group amplifier , its output impedanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 罗可欣赵毅马艳忠
Owner SHANGHAI ANLOGIC INFOTECH CO LTD
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