Circuits and methods for multiple-input, single-output, low-drop

Details Circuits and methods for multiple-input, single-output, low-drop Circuits and methods for multiple-input, single-output, low-drop

1998-09-14

2000-08-01

Berhane, Adolf Deneke

Electricity: power supply or regulation systems

Output level responsive

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

G05F 144

Patent

active

060971789

ABSTRACT:
The circuits and methods of the present invention provide multiple-input, single-output, low-dropout voltage regulators that use at least two output stages to drive an output terminal that may be connected to an output load. An error amplifier may also be used to regulate the voltage provided by these output stages to the output terminal. In one embodiment, this error amplifier also is used in conjunction with detection and control circuitry to select the output stage or stages providing power to the output terminal. In other embodiments, only the detection and control circuitry is used to select the output stage or stages providing power to the output terminal. The regulators allow power to be provided by a primary power source regardless of the primary power source's voltage relative to other power sources by measuring the voltage provided at the output terminal or by detecting dropout in an output stage, rather than by comparing the voltages provided by the power sources.

REFERENCES:
patent: 4779037 (1988-10-01), Locascio
patent: 5465011 (1995-11-01), Miller et al.
patent: 5539603 (1996-07-01), Bingham
patent: 5847550 (1998-12-01), Schie et al.

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