Patent ID: 8710914

Claim:
A voltage regulation system, comprising: a regulator section, including: a power transistor connected between a supply level and an output of the voltage regulation system; a feedback path to receive feedback from the output of the voltage regulation system; an operational amplifier having first and second inputs and having an output connected to the gate of the power transistor, where the first input of the operational amplifier is connected to a reference level; and switching circuitry, whereby the second input of the operational amplifier is selectively connectable to either receive feedback from the feedback path or ground; and detection circuitry connected to the switching circuitry and to receive the output of the operational amplifier and an enable signal, whereby the second input of the operational amplifier is connected to ground when the enable signal is asserted and the voltage level on the output of the operational amplifier is above a first regulation level and is otherwise connected to receive the feedback, wherein the detection circuitry includes: a first, p-type transistor connected between the supply level and an intermediate node, having a node connected to the output of the operational amplifier; and a second, n-type transistor connected between the intermediate node and ground, having a gate connected to receive the enable signal, wherein the switching circuitry is set based upon the level on the intermediate node.