Dual input low drop out voltage regulator

Details Dual input low drop out voltage regulator Dual input low drop out voltage regulator

G - Physics

05

F

323/5

G05F 1/571 (2006.01) G05F 1/569 (2006.01) H02J 9/06 (2006.01)

Patent

CA 1295015

Abstract of the Disclosure 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.

583212

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