Low drop out voltage regulator

Details Low drop out voltage regulator Low drop out voltage regulator

2008-02-21

2009-06-16

Ullah, Akm E (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

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

C323S312000, C323S314000, C323S273000

Reexamination Certificate

active

07548051

ABSTRACT:
A low drop out voltage regulator, comprising first and second field effect transistors arranged in series between a regulator input and a regulator output; a third field effect transistor co-operating with the first field effect transistor to form a first current mirror; a fourth field effect transistor co-operating with the second field effect transistor to form a second current mirror; first and second control transistors, which advantageously are bipolar transistors connected in series with the third and fourth field effect transistors respectively so as to control the current flowing therein; and a controller for providing a control signal to the first and second bipolar transistor as a function of a voltage at the regulator output.

REFERENCES:
patent: 4442398 (1984-04-01), Bertails et al.
patent: 4471292 (1984-09-01), Schenck et al.
patent: 6081107 (2000-06-01), Marino
patent: 6188212 (2001-02-01), Larson et al.

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