LDO (Low DropOut Regulator) based on dynamic zero pole tracking technology

A zero-pole, technical technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of LDO loop stability and other problems, and achieve the effect of improving stability

Inactive Publication Date: 2012-07-04
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of the stability of the

Method used

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  • LDO (Low DropOut Regulator) based on dynamic zero pole tracking technology
  • LDO (Low DropOut Regulator) based on dynamic zero pole tracking technology
  • LDO (Low DropOut Regulator) based on dynamic zero pole tracking technology

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Embodiment Construction

[0016] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0017] The LDO compensation structure thought of the present invention is as follows: the error amplifier adopts the OTA of unipolar symmetrical structure, the buffer realizes with the PMOS source follower, increases the driving ability to the PMOS regulator tube, and the frequency compensation adopts the miller capacitor and the dynamic zero point (variable MOS resistor+ fixed capacitance) combined method. In order to improve the transient response of LDO when the load changes suddenly, a slew rate enhancement circuit is added.

[0018] figure 1 It is a system block diagram of LDO based on dynamic zero-pole tracking technology, including error amplifier Gain Stage, buffer Buffer, slew rate enhancement circuit SRE, first capacitor C c , the second capacitance C m and variable resistor R c , the output end of the error amplifier Gain Stage ...

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Abstract

The invention discloses an LDO (Low DropOut Regulator) based on a dynamic zero pole tracking technology, belonging to the field of power supply management. The LDO is provided to solve the problem of the stability of a traditional LDO loop, and specifically comprises an error amplifier, a buffer and a slew-rate enhancement circuit. The LDO is characterized by further comprising a first capacitor, a second capacitor and a variable resistor, wherein one end of the first capacitor is connected with the output end of the error amplifier, the other end of the first capacitor is connected with one end of the variable resistor, one end of the second capacitor is connected with the error amplifier, and the other end of the second capacitor is connected with the other end of the variable resistor and is taken as the output end of the LDO. According to the LDO based on the dynamic zero pole tracking technology, disclosed by the invention, the first capacitor and the variable resistor form a compensative network as a dynamic zero pole of a system; and in addition, a phase margin of the LDO loop is compensated by utilizing the second capacitor in a current multiplication mode so that the stability of the LDO loop is improved.

Description

technical field [0001] The invention belongs to the field of power management, and in particular relates to the design of a low dropout linear regulator (LDO, Low Dropout Regulator). Background technique [0002] The power management module is the basic unit circuit of the chip, and its design is particularly important in the field of hand-held and portable devices. The low-dropout linear regulator without off-chip capacitors is a typical linear regulator structure that is popular now. With the widespread use of current portable devices, new requirements are put forward for the performance of LDO: lower power consumption, that is, smaller voltage drop and lower quiescent current; better transient response, that is, better compensation way and topology. [0003] Loop stability is a key indicator of LDO, and traditional LDO adopts the ESR (Equivalent Series Resistance) compensation method on the output capacitor. Because the ESR is easily affected by the environment, such a...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 周泽坤胡志明张雨河石跃明鑫张波
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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