Low drop-out voltage regulator with PMOS pass element

Details Low drop-out voltage regulator with PMOS pass element Low drop-out voltage regulator with PMOS pass element

1997-12-17

1999-02-02

Riley, Shawn

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

327542, G05F 316

Patent

active

058670157

ABSTRACT:
A voltage regulator circuit includes: a first MOS transistor 12 coupled between a voltage supply line and an output node 44, the first MOS transistor 12 providing a stable voltage on the output node 44; a source follower 24 coupled to a gate of the first MOS transistor 12; an amplifier 38 coupled to a gate of the source follower 24 for controlling the response of the first MOS transistor 12; negative feedback circuitry coupled between the output node 44 and the amplifier 38, the feedback circuitry providing feedback to the amplifier 38; a current conveyer 46 coupled to the first MOS transistor 12; and positive feedback circuitry 26 coupled between the current conveyer 46 and the source follower 24.

REFERENCES:
patent: 4954769 (1990-09-01), Kalthoff
patent: 5751639 (1998-05-01), Ohsawa

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