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Linear voltage regulator

A technology of linear voltage regulators and devices, which is applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc. It can solve the problems of rapid drop of output voltage OUT and failure of output load circuit to achieve the effect of eliminating current backflow

Active Publication Date: 2017-09-19
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The jump of this power supply voltage VDD will cause the output voltage OUT to drop rapidly, so that the output load circuit cannot work normally.

Method used

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  • Linear voltage regulator
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Embodiment Construction

[0041] Such as figure 2 Shown is the circuit diagram of the linear voltage regulator of the embodiment of the present invention; the linear voltage regulator of the embodiment of the present invention includes: an error amplifier, a voltage adjustment device and a feedback network.

[0042] The error amplifier includes an amplifier body, a tail current source and an active load.

[0043]The amplifier body has a differential structure and includes a first differential circuit and a second differential circuit, the source terminal of the first differential circuit and the source terminal of the second differential circuit are connected to the tail current source, The active load includes a first differential active load and a second differential active load which are mirror images of each other, the first differential active load is connected to the load end of the first differential circuit, and the second differential active load is connected to the load end of the first diff...

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PUM

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Abstract

The invention discloses a linear voltage regulator, which comprises an error amplifier, a voltage regulating device, a feedback network, a voltage comparison branch and a switch tube, wherein a first capacitor is connected with a control terminal of the voltage regulating device through the switch tube; the voltage comparison branch is used for comparing power voltage with output voltage; an output end of the voltage comparison branch outputs a control signal to control the switch tube; when the power voltage is greater than or equal to the output voltage, the switch tube is conducted and the first capacitor and the control terminal of the voltage regulating device are conducted; and when the power voltage is smaller than the output voltage, the switch tube is cut off and electric connection between the first capacitor and the voltage regulating device is cut off. The linear voltage regulator is capable of eliminating backward flow of the current during tripping.

Description

technical field [0001] The invention relates to a semiconductor integrated circuit, in particular to a linear regulator. Background technique [0002] Linear regulators are widely used in integrated circuits, such as figure 1 Shown is the circuit diagram of the existing linear voltage regulator; the existing linear voltage regulator includes an error amplifier, a voltage adjustment device and a feedback network. [0003] The error amplifier includes an amplifier body composed of NMOS transistors MN1, MN2, MN3 and MN4, and the amplifier body is a cascode differential amplifier structure, PMOS transistors MP1, MP2, MP3 and MP4 form an active load, and NMOS transistor MN5 forms a tail Current source; the bias voltage VB1 is connected to the gate of the NMOS transistor MN5, the bias voltage VB2 is connected to the gates of the NMOS transistors MN2 and MN4, the bias voltage VB3 is connected to the gates of the PMOS transistors MP2 and MP4, and the bias voltage VB4 Connect to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 邵博闻
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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