Low drop-out voltage regulator apparatus

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

H - Electricity

02

M

H02M 3/135 (2006.01) G05F 1/565 (2006.01)

Patent

CA 2124884

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.

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