LOW-DROPOUT LINEAR REGULATOR AND CONTROL CIRCUIT THEREOF

WIPO Patent Application WO/2021/120703

A1

A low-dropout linear regulator (300) and a control circuit thereof. The control circuit comprises an error amplifier (310), a foldback current-limiting protection circuit (320), an undershoot suppression circuit (330), and an output detection circuit (340). The foldback current-limiting protection circuit (320) is used to limit output current of a power transistor (Mpout) and to provide short-circuit protection. The undershoot suppression circuit (330) is used to perform a pull-down with respect to a control terminal of the power transistor (Mpout) when undershoot of an output voltage (Vout) occurs. The output detection circuit (340) is used to determine, during a startup phase, whether or not the output voltage (Vout) has risen to a preset voltage value, and to turn off foldback features of the foldback current-limiting protection circuit (320) and the undershoot suppression circuit (330) before the output voltage (Vout) rises to the preset voltage value, thereby preventing malfunctions of the foldback current-limiting protection circuit (320) and the undershoot suppression circuit (330) from affecting normal startup of the circuit during a circuit startup procedure, and improving load starting capabilities of the circuit.

ZHANG LIDI (CN)

PCT/CN2020/113558

June 24, 2021

September 04, 2020

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SG MICRO CORP (CN)

G05F3/26

CN209297188U	2019-08-23
CN102655370A	2012-09-05
CN103392159A	2013-11-13
CN104536507A	2015-04-22
CN106774580A	2017-05-31
US20150061622A1	2015-03-05
US20050275394A1	2005-12-15

TOWIN INTELLECTUAL PROPERTY AGENCY LTD. (CN)

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