Low dropout (LDO) voltage regulator

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United States of America Patent

PATENT NO 11703898
APP PUB NO 20230009164A1
SERIAL NO

17371281

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Importance

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Abstract

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A low dropout (LDO) voltage regulator includes a first LDO stage that receives a first supply voltage and is active during a first time interval and a second LDO stage that receives a second supply voltage and is active during a second time interval. An operational amplifier receives a feedback voltage based on the LDO output voltage and provides an amplified feedback signal to the first and second LDO stages. A compensation capacitor is selectively coupled between the operational amplifier and either the first or the second LDO stage. A current limit circuit includes a sense FET coupled to the LDO pass FET, a drain voltage replication circuit coupled between the pass FET and sense FET to provide a sense current is indicative of load current when the pass FET is in a linear region, and a current comparator to compare the sense current to a predetermined current level.

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Patent Owner(s)

Patent OwnerAddress
ALLEGRO MICROSYSTEMS LLC955 PERIMETER ROAD MANCHESTER NH 03103-3353

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Georgievski, Gorjan Milan, IT 1 0
Oddone, Giorgio Aosta, IT 24 169
Suraci, Michele Turate, IT 5 0

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