Low dropout voltage stabilizer circuit

A low-dropout voltage regulator and circuit technology, which is applied in the field of circuits, can solve problems such as poor performance of the low-dropout voltage regulator circuit, and achieve the effects of small jumps, reduced area, and increased stability

Active Publication Date: 2017-01-04
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem solved by the present invention is that the performance

Method used

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  • Low dropout voltage stabilizer circuit
  • Low dropout voltage stabilizer circuit
  • Low dropout voltage stabilizer circuit

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Embodiment Construction

[0025] It can be seen from the background art that the low dropout voltage regulator circuit in the prior art has poor performance.

[0026] An embodiment of the present invention provides a low-dropout regulator circuit with a sleep mode, including an error amplifier circuit, a buffer circuit, a power amplifier circuit and a feedback circuit. The error amplifier circuit outputs a stable output voltage through the power amplifier circuit by comparing the reference voltage and the divided voltage of the output voltage by the feedback circuit, and the buffer circuit is located between the error amplifier circuit and the power amplifier circuit Between, the response speed of the whole low dropout regulator circuit can be improved. In the present invention, the error amplifier circuit and the buffer circuit are also adapted to access a dormancy control signal, and the dormancy control signal can change the bias current of the error amplifier circuit and the buffer circuit, so that...

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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, so 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, its First, the actual power supply voltage is converted to the set regulated voltage, and then the converted regulated voltage is provided to the working circuit, thus ensuring that when the power supply voltage of electronic equipment changes, ...

Claims

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Application Information

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IPC IPC(8): G05F1/575G05F3/26
Inventor 柯可人
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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