Low voltage dropout regulator

Details Low voltage dropout regulator Low voltage dropout regulator

1987-07-01

1988-12-20

Wong, Peter S.

Electricity: power supply or regulation systems

Input level responsive

Using a linearly acting final control device

323274, G05F 500

Patent

active

047927470

ABSTRACT:
A high efficiency dropout regulator (60) drives an output transistor (22) with a PNP transistor (52) if the overhead voltage from input (14) to output (26) is below a predetermined voltage. If the overhead voltage exceeds the predetermined voltage, then a second PNP transistor (64) and an NPN transistor (72) are used to drive the output transistor (22), resulting in a large reduction of power loss. The current drawn from the output transistor (22) by the NPN transistor (72) is returned to the output.

REFERENCES:
patent: 4543522 (1985-09-01), Moreau
patent: 4613809 (1986-09-01), Skovmand

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