Patent ID: 7880456

Claim:
A circuit comprising: a pass transistor; an output pin; a high-side transistor coupled to the output pin; a low-side transistor coupled to the output pin; a feedback pin having a feedback voltage; a first error amplifier coupled to the feedback pin to provide a first error signal to the pass transistor in response to the feedback voltage; a first comparator having an input port, and an output port to provide a pulse width modulation signal to the high-side transistor and the low-side transistor; a second error amplifier coupled to the feedback pin to provide a second error signal to the input port of the first comparator in response to the feedback voltage; a first current sense amplifier to provide a signal indicative of current flowing through the high-side transistor; a second current sense amplifier to provide a signal indicative of current flowing through the pass transistor; a second comparator to provide a signal indicative of current flowing through the low-side transistor; and a controller to change the high-side transistor and the low-side transistor from a disabled mode to an enabled mode to switch on and off in response to the pulse width modulation signal when the signal provided by the second current sense amplifier is indicative of the pass transistor current exceeding a first threshold.