Patent ID: 7768756

Claim:
An integrated circuit (IC) comprising: a first transistor configured to couple a first voltage source from a first node of the first transistor to a second node of the first transistor; a second transistor configured to couple a second voltage source from a first node of the second transistor to a second node of the second transistor; a monitoring circuit configured to control the first and second transistors to control switching of one of the first voltage source and the second voltage source to an output; and a leakage current protection circuit configured to substantially mitigate leakage current flow between the first voltage source and the output second voltage due to an undershoot condition at the first voltage source, wherein the leakage current protection circuit comprises a third transistor controlled by the monitoring circuit, the third transistor configured to switch the first node of the first transistor to a fixed voltage potential upon the second voltage source being switched to the output, wherein the third transistor is coupled between the fixed voltage potential and the first node of the first transistor.