Low Dropout Regulator Circuit

Abstract

The invention provides a low dropout voltage stabilizer circuit. The low dropout voltage stabilizer circuit comprises an error amplifier circuit, a buffer circuit, a power amplification circuit and a feedback circuit. The first input end of the error amplifier circuit is connected with reference voltage, and the output end of the error amplifier circuit is connected with the input end of the buffer circuit. The input end of the power amplification circuit is connected with the output end of the buffer circuit, and the output end of the power amplification circuit serves as the output end of the low dropout voltage stabilizer circuit. The input end of the feedback circuit is connected with the output end of the power amplification circuit, and the output end of the feedback circuit is connected with the second input end of the error amplifier circuit. The error amplifier circuit and the buffer circuit are suitable for being connected with dormancy control signals, and the dormancy control signals can change the bias current of the error amplifier circuit and the bias current of the buffer circuit so that the low dropout voltage stabilizer circuit can work in a normal mode or a low-power-consumption mode. The low dropout voltage stabilizer circuit has a dormancy mode and is applicable to low-voltage input and is good in performance.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a low-dropout regulator circuit. Background technique [0002] In electronic equipment, the power supply voltage may usually vary within a large range. For example, a lithium-ion battery in a portable device can provide a voltage of 4.2 volts when it is fully charged, and can only provide a voltage of 2.3 volts after discharge. The range of variation is very large. Big. The working circuit of electronic equipment usually requires a stable power supply voltage. Therefore, at present, a low dropout regulator (LDO: Low Dropout Regulator) circuit is usually added to the output of the power supply. Since the low dropout regulator has a set voltage regulation, It first converts the actual power supply voltage into the set regulated voltage, and then provides the converted regulated voltage to the working circuit, thus ensuring that when the power supply voltage of the electronic equipment chan...

AI Technical Summary

Problems solved by technology

[0005] The problem solved by the present invention is that the performance of the low dropout voltage regulator circuit in the prior art is not good

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