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Low-dropout linear regulator circuit

A low-dropout linear, voltage-stabilizing circuit technology, applied in the field of circuits, can solve the problem of excessive overhead in raising the current capacity of the LDO circuit, and achieve the effect of reducing the threshold voltage and increasing the maximum output current

Active Publication Date: 2018-06-29
SHENZHEN GOODIX TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The embodiment of the present invention provides a low-dropout linear voltage regulator circuit to solve the problem of excessive current boosting overhead of the existing LDO circuit

Method used

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Embodiment Construction

[0039] In order to make the purpose, features, and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, The described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the embodiments of the present invention.

[0040] figure 2 It is a schematic block diagram of a low dropout linear regulator circuit according to an embodiment of the present invention, image 3 It is a schematic diagram of a low dropout linear voltage stabilizing circuit according to an embodiment of the present invention, the low drop...

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Abstract

Embodiments of the present invention provide a low-dropout linear regulator circuit. The low-dropout linear voltage stabilizing circuit comprises: an output voltage detecting circuit for detecting anoutput voltage of the low-dropout linear voltage stabilizing circuit and generating a corresponding feedback voltage; and an error amplifying circuit for comparing the feedback voltage and the reference voltage, and Generating a corresponding error voltage; a power tube, the output current of the power tube is adjusted according to the error voltage; and a substrate voltage adjustment circuit connected to the power tube and configured to be adjusted according to an output current of the power tube The substrate voltage of the power tube is such that the substrate voltage decreases with the increase of the output current within a predetermined fluctuation range, thereby appropriately reducing the threshold voltage of the power tube, and substantially increasing the maximum output current ofthe low-dropout linear regulator circuit.

Description

technical field [0001] Embodiments of the present invention relate to circuit technology, in particular to a low-dropout linear regulator circuit. Background technique [0002] LDO (Low Dropout Regulator, low-dropout linear regulator) uses a transistor or field effect transistor (FET) operating in its linear region to subtract excess voltage from the input voltage to produce a regulated output voltage. Because of its low cost, low noise, and low quiescent current, it is widely used in power supply circuits. [0003] figure 1 It is a basic circuit structure diagram of an LDO circuit in the prior art. The LDO circuit is mainly composed of the following three modules: the first feedback resistor R F1 and the second feedback resistor R F2 Composed of an output voltage detection circuit that detects the output voltage VOUT and generates a corresponding feedback voltage, compares the feedback voltage VF with the reference voltage VREF, and generates the error amplifier EA of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 李亮
Owner SHENZHEN GOODIX TECH CO LTD
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