Patent ID: 6703816
Filing Date: 2004-03-09
Classification: G05F

Abstract:
A low drop-out regulator for providing an output voltage to a load device, said low drop-out regulator comprising:a pass device comprising a power transistor having an output terminal configured for providing the output voltage to the load device; an error amplifier having an output terminal providing a current configured for driving said pass device, said error amplifier having a capacitor device configured between said output terminal and an inverting input terminal of said error amplifier; an active resistor configured between said output terminal of said pass device and said inverting input terminal of said error amplifier to provide a composite loop; and a composite loop compensation circuit comprising: at least one segmented sense device configured for sensing an output load current delivered by said pass device; a least one switch coupled to said at least one segmented sense device; and a biasing component coupled between said at least one switch and said active resistor, said biasing component being configured for biasing said active resistor to adjust a dominant first pole created by said active resistor and said capacitor device based on said output load current delivered by said pass device.