a fully integrated circuit configuration that can be used to control the power path of a number of pmos load switches is described . the circuit has a unique feature that it can automatically select the input voltage to be presented to the vout pin based upon the voltage levels at the respective vin pins . by using combinations of the en input pin and the sel input pin , the circuit can be configured to perform one of four functional behaviors : 1 . complete shutdown , 2 . automatic input selection according the voltage levels that are presented on the vin pins , 3 . selection of the vin1 input only , or 4 . selection of the vin2 input only . this concept is extended to multiple input sources in further embodiments .