1. A switching circuit connectable between an input source voltage obtained from a first voltage and a second voltage that is not the same as the first voltage and an output load for controlling an inrush current to the output load upon turn-on, the switching circuit including: an integrated circuit, the integrated circuit including: a first voltage input for inputting the first voltage; a second voltage input for inputting the second voltage that is not the same as the first voltage; a first power PMOS load switch including a first load switch gate, a first load switch source and a first load switch drain, the inrush current to the output load passing from the first load switch source to the first load switch drain and being controlled by a first load switch control voltage on the first load switch gate; a second a second power PMOS load switch including a second load switch gate, a second load switch source and a second load switch drain, the inrush current to the output load passing from the second load switch source to the second load switch drain and being controlled by a second load switch control voltage on the second load switch gate; a slew rate control circuit connected to the first load switch gate and the second load switch gate that provides the load switch control voltage to the first and second power PMOS load switches; and an input VCC selection module that selects between one of the first voltage input and the second voltage input automatically depending upon which has the highest voltage potential relative to the other input voltage, and provides an input control signal indicating the selection to the slew rate control circuit.