Dual input low dropout voltage regulator

Details Dual input low dropout voltage regulator Dual input low dropout voltage regulator

1987-11-17

1988-10-18

Salce, Patrick R.

Electricity: power supply or regulation systems

Output level responsive

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

323281, 323303, 307 48, G05F 1565

Patent

active

047790377

ABSTRACT:
A low dropout voltage regulator with a switched redundant input, which has low dropout voltage before, during, and after a switch to the redundant input. In a preferred embodiment, the inventive voltage regulator includes two transistors that are controlled by the output of an error amplifier, and redundant input voltage sources. A first one of the transistors conducts when a first input voltage is greater than a second input voltage. The other transistor conducts when the second input voltage exceeds the first input voltage. When both input voltages are have substantially equal magnitude, both transistors conduct. In a preferred embodiment, one input voltage is supplied by a battery, and the other is supplied by a storage capacitor charged by the battery. When the battery fails, the storage capacitor will discharge, thus serving as a time-varying redundant voltage source in the event of battery failure.

REFERENCES:
patent: 4209710 (1980-06-01), Quarton
patent: 4354118 (1982-10-01), Spencer
patent: 4384350 (1983-05-01), Lee et al.
patent: 4543522 (1985-09-01), Moreau
patent: 4645943 (1987-02-01), Smith et al.
patent: 4716354 (1987-12-01), Hacker

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