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An overshoot protection circuit, a linear voltage regulator and a power module

A linear voltage regulator and protection circuit technology, applied in the direction of instruments, adjusting electric variables, control/regulation systems, etc., can solve problems such as damage to low-voltage logic devices, reduce the reliability and life of low-voltage logic devices, and voltage overshoot, etc., to achieve Avoid the effect of being damaged

Active Publication Date: 2021-07-27
HUNAN GOKE MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the parasitic capacitance inside the circuit structure of the existing low-voltage linear regulator, voltage overshoot will occur when the low-voltage linear regulator is quickly powered on, causing the output voltage of the low-voltage linear regulator to increase instantaneously, resulting in The low-voltage logic device at the end will be damaged to a certain extent, reducing the reliability and life of the low-voltage logic device

Method used

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  • An overshoot protection circuit, a linear voltage regulator and a power module
  • An overshoot protection circuit, a linear voltage regulator and a power module
  • An overshoot protection circuit, a linear voltage regulator and a power module

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Embodiment Construction

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

[0020] It should be noted ...

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Abstract

Embodiments of the present invention provide an overshoot protection circuit, a linear voltage regulator and a power module, which relate to the technical field of analog integrated circuits. The overshoot protection circuit is applied to a linear voltage regulator, and the overshoot protection circuit includes a first switch unit and a second switch unit; the first switch unit is electrically connected to the input terminal of the linear voltage regulator and the second switch unit, and the second switch unit The switch unit is electrically connected to the output terminal of the linear voltage regulator; the first switch unit is used to control the second switch unit to be in an open circuit state when the linear voltage regulator is working normally, and to control the second switch unit when the linear voltage regulator is quickly powered on In the conduction state; the second switch unit is used to form a low-impedance path when the linear voltage regulator is quickly powered on, and then step down the output voltage of the linear voltage regulator to a preset value. The overshoot protection circuit has an overshoot protection function when the linear voltage regulator is quickly powered on, so as to avoid the harmful influence of the output voltage of the linear voltage regulator on the voltage device it drives.

Description

technical field [0001] The invention relates to the technical field of analog integrated circuits, in particular to an overshoot protection circuit, a linear voltage regulator and a power supply module. Background technique [0002] A low dropout regulator (LDO) is a commonly used analog circuit, and its function is to generate a stable DC voltage with a large current driving capability. Since the output voltage of a low-voltage linear regulator must be less than its supply voltage, the role of a low-voltage linear regulator in an integrated circuit is to step down an external higher power supply to a specific voltage to power internal low-voltage logic devices. [0003] Due to the parasitic capacitance inside the circuit structure of the existing low-voltage linear regulator, voltage overshoot will occur when the low-voltage linear regulator is quickly powered on, causing the output voltage of the low-voltage linear regulator to increase instantaneously, resulting in The l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 何力
Owner HUNAN GOKE MICROELECTRONICS
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