Patent ID: 8013473

Claim:
A system comprising: a first regulator coupled to a first input node and operable in a first mode to regulate a voltage at an output node; a second regulator coupled to a second input node and operable in a second mode to regulate the voltage at the output node; a mode circuit that disables current flow through one of the first or the second regulator to the output node depending on the mode including generating a bias signal using a voltage provided by an operating regulator of the first or second regulator for a given mode applied through a pull up or pull down resistor to disable a pass transistor associated with a respective one of the first or the second regulator depending on the mode; and a controller to select the first mode or the second mode based on which of the first regulator or the second regulator has a highest voltage including to select the first mode when a first voltage level signal associated with the first input node is greater than a second voltage level signal associated with the second input voltage node, and to select the second mode when the first voltage level signal is less than the second voltage level signal.