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Low dropout linear regulator circuit with low power consumption and fast transient response

A low-dropout linear and transient response technology, applied in the direction of instruments, regulating electrical variables, control/regulation systems, etc., can solve the problems of large static power consumption and inability to meet transient response capabilities, etc., achieve low power consumption and improve load Response speed, effect of improving load transient performance

Active Publication Date: 2022-03-11
上海瓴瑞微电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the technical problem that the static power consumption of the traditional LDO circuit is large and cannot meet the higher requirements of the transient response capability, and the purpose is to provide a low-power dropout linear voltage regulator circuit with low power consumption and fast transient response

Method used

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  • Low dropout linear regulator circuit with low power consumption and fast transient response
  • Low dropout linear regulator circuit with low power consumption and fast transient response

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Embodiment Construction

[0062] In order to make the techniques of the present invention, the creation characteristics, the purpose and efficacy are readily understood, and the present invention is further illustrated in conjunction with specific illustration.

[0063] Refer figure 2 , A low-voltage difference linear regulator circuit, including error amplifier, series-connected power tube MPower, resistance feedback network, compensation capacitor C2, source follow buffer, bias circuit, load transient response Enhanced circuit circuit and mode switching circuit.

[0064] The same direction of the error amplifier connects the reference voltage VREF, and the reverse input of the error amplifier is connected to the feedback terminal Vfb. Error amplifiers include tail current sources, differential pairs, and load current source circuits.

[0065] The tail current source is the PMOS tube PM0, the tail current source affects the bandwidth of the error amplifier, and there is a role in transients. The gate of t...

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Abstract

The invention belongs to the technical field of electronic circuits and semiconductors, and particularly relates to a low dropout regulator circuit. A low dropout linear regulator circuit with low power consumption and fast transient response comprises an error amplifier; the grid electrode of the series adjustment power tube is connected with the output end of the error amplifier; the resistance feedback network is provided with a first resistor and a second resistor which are connected in series, the common end of the first resistor and the second resistor serves as a feedback end, and the other end of the second resistor is grounded; the non-inverting input end of the error amplifier is connected with reference voltage, and the inverting input end is connected with the feedback end; the drain electrode of the series adjustment power tube is connected with the power input end, and the source electrode is connected with the circuit output end which is further connected with the other end of the first resistor. And the output end of the biasing circuit is respectively connected with the error amplifier and the output end of the circuit. The low dropout linear regulator circuit has a fast load transient response function, and the load response speed of the low dropout linear regulator circuit is improved through a simple circuit.

Description

Technical field [0001] The present invention belongs to the field of electronic circuitry and semiconductor technology, and more particularly to a low pressure difference linear regulator circuit. Background technique [0002] Power supply and power adjustment are the most basic functions of electrical systems. Any load application, if there is no stable power supply, it is not working properly. Low-pressure difference linear regulator (LDO) is increasingly widely used in SoC design due to its simple structure, low power consumption, low output ripple and less peripheral circuits. The low-voltage difference linear regulator circuit mainly includes a reference voltage source, an error amplifier, a series of tube and a resistive feedback network. [0003] figure 1 It is a structural diagram of a typical low-voltage difference linear regulator, where the reference voltage Vref is connected to the reverse input of the error amplifier, and the same direction of the error amplifier is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56Y02B70/10
Inventor 李天望
Owner 上海瓴瑞微电子有限公司
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