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Low-dropout linear voltage stabilizer

A low-dropout linear voltage regulator technology, which is applied in the direction of instruments, control/regulation systems, and electrical variable adjustment, can solve the problems of limited loop speed and large output impedance of low-dropout linear voltage regulators, and achieve small output impedance , fast discharge speed, and improved transient response

Active Publication Date: 2020-06-02
BYD SEMICON CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like figure 1 As shown, the existing low-dropout linear regulator uses a voltage series negative feedback loop to drive the regulator tube to adapt to changes in the load current, and its output impedance is relatively large, so the loop of the low-dropout linear regulator with this structure limited speed

Method used

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Embodiment Construction

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the drawings in the embodiments of the present disclosure. Apparently, the described embodiments are only some of the embodiments of the present disclosure, not all of them. The components of the disclosed embodiments generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0043] Accordingly, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely represents selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative effort shall fall within the protection scope of the present disclosure.

[0044] It should be not...

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Abstract

The disclosure relates to the technical field of voltage stabilizers, in particular to a low-dropout linear voltage stabilizer. The low-dropout linear voltage stabilizer comprises a band-gap referencecircuit (10), a first operational amplifier (OPA1), a first adjusting tube (M1), a first compensation module (30), a second operational amplifier (OPA2), a second MOS tube (M2), a second compensationmodule (50) and an adjustable resistor (R0). The first adjusting tube (M1) is a PMOS tube, and the second MOS tube (M2) is a PMOS tube or a plurality of PMOS tubes are arranged and connected in series and / or in parallel. The output voltage clamping mode and the circuit structure of the low-dropout linear voltage stabilizer are different from those of the existing low-dropout linear regulator, theoutput impedance of the low-dropout linear voltage stabilizer is smaller than that of the existing low-dropout linear regulator, the discharging speed is higher, and the load sudden change transientresponse is improved.

Description

technical field [0001] The present disclosure relates to the technical field of voltage regulators, in particular, to a low-dropout linear voltage regulator. Background technique [0002] A low dropout linear regulator (low dropout regulator, LDO) is used to convert the supply voltage at the power supply terminal into a stable voltage and output it through the output terminal of the low dropout linear regulator. Such as figure 1 Shown is a circuit diagram of an existing low-dropout linear regulator. Such as figure 1 As shown, the existing low-dropout linear regulator uses a voltage series negative feedback loop to drive the regulator tube to adapt to changes in the load current, and its output impedance is relatively large, so the loop of the low-dropout linear regulator with this structure Speed ​​is limited. Contents of the invention [0003] In view of this, the purpose of the present disclosure is to provide a low dropout linear voltage regulator with smaller outpu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/46
CPCG05F1/461G05F1/468
Inventor 张旭龙裴学用郭先清
Owner BYD SEMICON CO LTD
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