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Buffer applied to low-dropout regulator

A technology of buffers and regulators, which is applied in the direction of instruments, regulating electrical variables, control/regulation systems, etc., and can solve problems such as poor stability

Active Publication Date: 2013-12-25
ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a buffer applied to a low-dropout voltage regulator, aiming to solve the problem of poor stability of the low-dropout voltage regulator loop in the prior art

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  • Buffer applied to low-dropout regulator
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  • Buffer applied to low-dropout regulator

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Embodiment Construction

[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0018] By designing a PMOS source follower that can be dynamically biased and has negative feedback, the output impedance of the buffer decreases as the output load current increases, and the stability of the loop is improved.

[0019] image 3 A schematic block diagram of a buffer applied to a low dropout regulator provided by the first embodiment of the present invention is shown.

[0020] The buffer used in the low dropout regulator is connected between the error amplifier and the PMOS power transistor. The buffer includes:

[0021] PMOS source follower 100, connected between the error amplifi...

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Abstract

The invention is applicable to the field of power supply management circuits, and provides a buffer applied to a low-dropout regulator. The buffer comprises a P-channel metal oxide semiconductor (PMOS) source follower, a first current mirror, a second current mirror and a negative feedback circuit. According to the buffer provided by the invention, through designing the PMOS source follower capable of dynamically offsetting and with negative feedback, the output impedance of the buffer is reduced with the increasing of an output load current, and the stability of a loop is improved.

Description

technical field [0001] The invention belongs to the field of power management circuits, in particular to a buffer applied to a low dropout regulator. Background technique [0002] A low-dropout regulator (LDO) is a power management module widely used in handheld devices and portable electronic products. The core part of LDO is composed of three basic modules such as error amplifier, buffer and PMOS power transistor MP. figure 1 It is a typical circuit structure diagram of LDO, where the buffer (buffer) is used to drive the PMOS power transistor MP, which plays a very important role in improving the transient response performance of the LDO and improving the stability of the entire loop. Therefore, in the design process of LDO, it is very necessary to design the snubber circuit well. [0003] In the prior art, there is a buffer composed of an improved PMOS source follower, such as figure 2 As shown, the PMOS power transistor Mp13 dynamically monitors the change of the LDO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/656
Inventor 梁仁光胡胜发
Owner ANYKA (GUANGZHOU) MICROELECTRONICS TECH CO LTD