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Low-power-consumption and low-drop-out voltage regulator capable of performing transient state response

A voltage regulator, transient response technology, applied in instruments, regulating electrical variables, control/regulating systems, etc., can solve the problem of large delay in charging and discharging of the gate of the output power tube, affecting the slew rate of the gate charging and discharging voltage, power The problem of too large gate capacitance of the tube can reduce the charging and discharging time, improve the load transient response speed, and improve the bidirectional slew rate.

Active Publication Date: 2017-08-29
CHENGDU SINO MICROELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, it is also very important to improve the conversion efficiency of the low dropout voltage regulator itself. The two main parameters that affect the conversion efficiency of the low dropout voltage regulator are the low dropout voltage and the quiescent current. The low dropout voltage requires an increase in the power tube area, which will cause the power tube The gate capacitance is too large, and the low quiescent current will affect the slew rate of the gate charge and discharge, thus affecting the loop load transient response speed
Traditional low dropout voltage regulator structures such as figure 1 As shown, V OUT Peaks are generated when the load changes transiently. Due to the limited quiescent current limit of the op amp, the output power tube gate V G The charge and discharge delay will be large, V OUT It takes a certain amount of time to restore stability. The common improvement method for low-power low-dropout voltage regulators is to increase the quiescent current of the op amp. However, for high-current voltage regulators above 1A, the grid capacitance of the power tube is large. The quiescent current improves the transient response, which will greatly increase the quiescent power consumption of the entire LDO, so traditional low-dropout voltage regulators cannot balance low power consumption and fast load transient response at the same time

Method used

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  • Low-power-consumption and low-drop-out voltage regulator capable of performing transient state response
  • Low-power-consumption and low-drop-out voltage regulator capable of performing transient state response
  • Low-power-consumption and low-drop-out voltage regulator capable of performing transient state response

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Embodiment

[0063] This embodiment includes: an error amplifier, two feedback proportional resistors R f1 , R f2 , output power tube M P , driver, PNP-type fifth transistor Q5, third transistor Q3, NPN-type second transistor Q2, fourth transistor Q4, sixth transistor Q6, the specific connection relationship is: the reference voltage is connected to the same input terminal of the error amplifier, and the first feedback Sampling resistor R f1 One terminal is connected to the output voltage V OUT , the other end is connected to the inverting input end of the error amplifier, and the second feedback sampling resistor R f2 One end is connected to the inverting input end of the error amplifier, the other end is grounded, and the output end of the error amplifier V EA Connect to the base of the PNP fifth transistor Q5, and the emitter of the fifth transistor Q5 is connected to the output voltage V OUT , the collector of the fifth transistor Q5 is connected to the collector and base of the s...

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Abstract

The invention provides a low-power-consumption and low-drop-out voltage regulator capable of performing transient state response and relates to the field of analogue integrated circuits. The low-power-consumption and low-drop-out voltage regulator comprises an error amplifier connected with an input bias current source, an output power tube with the input end connected with the high-level input end and a feedback ratio resistor set, wherein the connecting point of the output power tube and the high-level input end serve as a final output end. The low-power-consumption and low-drop-out voltage regulator is characterized in that a first amplification module, a transient state response discharging access module and a driver module are arranged between the error amplifier and the output power tube. The output voltage recovery time in the transient state load changing process from big to small is effectively shortened.

Description

technical field [0001] The invention relates to the field of analog integrated circuits, in particular to a low dropout voltage regulator with fast transient response. Background technique [0002] The low-dropout voltage regulator is an important part of the power management circuit. It is usually used in the post-stage of the DC-DC switching circuit as a point-of-load power supply to provide a stable and reliable power supply voltage for the point-of-load. Due to its small voltage drop , high PSRR, low cost and other advantages, it has been widely used in portable electronic products. [0003] In the field of portable applications, in order to extend the battery power supply time: In terms of system design, by introducing the enable shutdown function, in a specific working mode, only some modules work, and some modules are in the off state, so in the process of switching between different working modes , the load current will jump instantaneously, from a few milliamps to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 冯浪岑远军李大刚马迎张克林林亚立
Owner CHENGDU SINO MICROELECTRONICS TECH CO LTD
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