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Low dropout linear regulator and control circuit thereof

A low-dropout linear, control circuit technology, applied in control/regulating systems, instruments, regulating electrical variables, etc., can solve the problems of permanent damage of power transistor Mpout, loss of circuit current, etc., to improve reliability and prevent damage.

Pending Publication Date: 2021-07-16
SG MICRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the rapid development of integrated circuits and the wide application of LDOs, sometimes there will be multiple power supplies at the load end, so that the output voltage Vout is greater than the input voltage Vin, or the input voltage Vin is shorted to ground or suspended during application. These will cause the parasitic body diode D1 in the power transistor Mpout to conduct forward, which will not only consume the current in the circuit, but may even cause permanent damage to the power transistor Mpout

Method used

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  • Low dropout linear regulator and control circuit thereof
  • Low dropout linear regulator and control circuit thereof
  • Low dropout linear regulator and control circuit thereof

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Embodiment Construction

[0031] Various embodiments of the invention will be described in more detail below with reference to the accompanying drawings. In the various drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale.

[0032]It should be understood that in the following description, a "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical or electromagnetic connections. When an element or circuit is said to be "connected to" another element or an element / circuit is said to be "connected between" two nodes, it can be directly coupled or connected to the other element or there can be intervening elements and the connection between elements can be be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled to" or "directly connected to" another element, there are no intervening el...

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Abstract

The invention discloses a low dropout linear regulator and a control circuit thereof. The control circuit comprises an error amplifier and an anti-backflow circuit, the anti-backflow circuit is used for comparing an input voltage with an output voltage so as to switch a substrate voltage and a control end voltage of a power transistor to the highest potential between the input voltage and the output voltage, therefore, when the output voltage is larger than the input voltage, the power transistor and the parasitic diode thereof can be turned off in time, the power transistor is prevented from being damaged by current backflow, and the reliability of the low dropout linear regulator is improved.

Description

technical field [0001] The present invention relates to the technical field of linear regulators, in particular to a low-power low-dropout linear regulator and a control circuit thereof. Background technique [0002] A low dropout regulator (Low Dropout Regulator, LDO) converts an unstable input voltage into an adjustable DC output voltage, so as to be used as a power supply for other systems. Because linear regulators have the characteristics of simple structure, low static power consumption, and small output voltage ripple, linear regulators are often used for on-chip power management of mobile consumer electronics chips. [0003] figure 1 A schematic circuit diagram of a conventional low dropout linear regulator is shown. Such as figure 1 As shown, the low dropout linear regulator 100 includes a power transistor Mpout, an error amplifier 110, and resistors R1 and R2. The power transistor Mpout is used to provide the output voltage Vout to the subsequent load according...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/575
CPCG05F1/575G05F1/56G05F1/461G05F3/262G05F1/563
Inventor 张利地
Owner SG MICRO