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Low dropout linear regulator

A low-dropout linear and voltage stabilizer technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., to solve the problem of insufficient power supply and fast response

Inactive Publication Date: 2012-06-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the existing defects in the response speed of the existing low-dropout linear voltage regulator, and propose a low-dropout linear voltage regulator

Method used

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Embodiment Construction

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

[0017] The schematic diagram of the basic structure of the LDO of the present invention is as figure 2 As shown, it specifically includes: error amplifier, first impedance unit RF1, second impedance unit RF2 and sampling network, and also includes an N-type adjustment transistor MN0, power supply undervoltage comparator, first PMOS transistor MP1 and second PMOS transistor MP2 , wherein, the positive output terminal of the error amplifier is connected to the first reference voltage VREF1, the output terminal is connected to the gate of the N-type regulator transistor; the drain of the N-type regulator transistor is connected to the external power supply VDD, and the source is used as the output terminal of the linear regulator ; One end of the first impedance unit RF1 is connected to the output end of the voltage regulator, the other end is co...

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Abstract

The invention belongs to the technical field of power supply management, discloses a low dropout linear regulator, and particularly comprises an error amplifier, a first impedance unit, a second impedance unit and a sampling network. The low dropout linear regulator is characterized by further comprising an N-shaped adjusting pipe, a power supply undervoltage comparator, a first p-channel metal oxide semiconductor (PMOS) pipe and a second PMOS pipe. The low dropout linear regulator adopts the N-shaped adjusting pipe to replace a P-shaped adjusting pipe, enables loading hops to be directly reflected on gate source voltage of the adjusting pipe, and does not need pass through a feedback loop to achieve fast response on loading changes. Simultaneously, the voltage drop of the low dropout regulator (LDO) utilizing the N-shaped adjusting pipe is big so that efficiency and other performance of the LDO can be influenced. In addition, the problem of insufficient power supply is solved with the help of the power supply undervoltage comparator.

Description

technical field [0001] The invention belongs to the technical field of power supply management, and in particular relates to the design of a low dropout linear regulator (LDO, Low Dropout Regulator). Background technique [0002] Low-dropout linear regulators can provide low output ripple power for noise-sensitive analog circuits and radio frequency circuits, and have a relatively simple structure and few peripheral components, so they are widely used in SoCs. In most applications, it is necessary to place an LDO with no output capacitor next to each circuit module, so that the optimization of the power supply of each circuit module can improve the overall performance of the system. [0003] Traditional LDOs such as figure 1 As shown, among them, VREF is the reference voltage generated by the reference circuit, EA is the error amplifier, MP is the PMOS output adjustment tube, R1 and R2 are the feedback resistors, RL and CL are the output resistance and capacitance respectiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 明鑫代高强刘焱周泽坤张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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