Patent ID: 7327127

Claim:
A power regulator comprising: a first node, wherein a first voltage developed at the first node is used to produce an output voltage of the power regulator; a first transistor having a control terminal, wherein the first transistor is coupled between a first supply voltage and the first node, wherein the first transistor is operable to supply current to the first node when the first transistor is conductive; a second transistor having a control terminal, wherein the second transistor is coupled between the first node and a second supply voltage; and a control circuit coupled to the control terminal of the first transistor and to the control terminal of the second transistor, wherein the control circuit is operable to sense the current, sense the output voltage, sense a polarity of the first voltage, and turn the first transistor and the second transistor on and/or off responsive to at least the current, the output voltage, and the polarity of the first voltage.