Low drop-out voltage regulator apparatus

Details Low drop-out voltage regulator apparatus Low drop-out voltage regulator apparatus

1994-06-01

1996-04-23

Nguyen, Matthew V.

Electricity: power supply or regulation systems

Output level responsive

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

323274, 323282, G05F 140, G05F 144

Patent

active

055106978

ABSTRACT:
A voltage regulator apparatus for regulating an unregulated voltage supply to in turn provide a regulated voltage. The voltage regulator apparatus includes a pass device, which has a control port, passes a portion of an unregulated voltage through to the regulated voltage output. The apparatus also includes a DC amplifier which provides a large closed loop gain to the regulated voltage output which is fed back to the pass device control port. The portion of the unregulated voltage passed to the regulated voltage output is a function of the output of the DC amplifier. The apparatus finally includes a voltage reference which provides a reference voltage to the DC amplifier. The DC amplifier voltage reference and pass device control port all draw the same operating current from the unregulated voltage supply. Thus, creating a sharp low-drop out characteristic for the voltage regulator apparatus.

REFERENCES:
patent: 3916294 (1975-10-01), Kennedy
patent: 4479085 (1984-10-01), Uchida et al.
patent: 4543522 (1985-09-01), Moreau
patent: 4560918 (1985-12-01), Callen
patent: 4792747 (1988-12-01), Schroeder
patent: 4928056 (1990-05-01), Pease
patent: 5373225 (1994-12-01), Poletto et al.
patent: 5453678 (1995-09-01), Bertolini et al.

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