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Patent Searching and Data


Title:
LOW DROPOUT-VOLTAGE LINEAR VOLTAGE REGULATOR HAVING HIGH POWER SUPPLY REJECTION RATIO
Document Type and Number:
WIPO Patent Application WO/2021/073305
Kind Code:
A1
Abstract:
Provided is a low dropout-voltage linear voltage regulator (200) having a high power supply rejection ratio, comprising an error amplifier (210) and a power transistor; the error amplifier (210) comprises a first input stage (211), a second input stage (212), and a control circuit (214); the first input stage (211) comprises a first transistor pair used for receiving an output voltage and a reference voltage; the second input stage (212) comprises a second transistor pair used for receiving an output voltage and a reference voltage; the first transistor pair and the second transistor pair have different conductivity types; the control circuit (214) is used for controlling the opening and closing of the first input stage (211) according to the reference voltage, and turning on the first input stage (211) when the reference voltage is less than a set threshold so that the error amplifier (210) can operate normally, ensuring that the output voltage changes smoothly, and turning off the first input stage (211) when the reference voltage is greater than a set threshold, such that only the second input stage (212) operates, thus the power supply rejection ratio of the low dropout linear voltage regulator (200) is not affected.

Inventors:
LIN YU (CN)
Application Number:
PCT/CN2020/113555
Publication Date:
April 22, 2021
Filing Date:
September 04, 2020
Export Citation:
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Assignee:
SG MICRO CORP (CN)
International Classes:
G05F1/56
Foreign References:
CN102376283A2012-03-14
CN103713682A2014-04-09
CN109683651A2019-04-26
CN107491129A2017-12-19
US6208208B12001-03-27
Attorney, Agent or Firm:
TOWIN INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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