The AT1601 is an integrated high-side power switch optimized for self-powered and buspowered Universal Serial Bus (USB) applications. With built-in a charge pump circuitry to drive the internal MOSFET switch, the switch's low onresistance meets USB voltage drop requirements. A flag output is available to indicate fault conditions to the local USB controller. The AT1601 includes soft-start to limit inrush current during plug-in, 1.4A current limit to limit the output current to a safe level which meet the UL 25VA safety requirements, thermal shutdown to prevent catastrophic switch failure from highcurrent loads, under voltage lockout (UVLO) to ensure that the device remains off unless there is a valid input voltage present, and an enable input that is compatible with both 3.3V and 5V logic.