FP6861E-A is a cost-effective, low voltage, adjustable current limit, single N-Channel MOSFET high-side power switch, optimized for self-powered and bus-powered Universal Serial Bus (USB) applications. FP6861E-A is equipped with a charge pump circuitry to drive the internal MOSFET switch. The switch's low RDS(ON) meets USB voltage drop requirement, and a flag output is available to indicate fault conditions to the local USB controller. FP6861E-A also provides adjustable current limit threshold between 0.125~3.76A through an external resistor. Additional features include soft-start to limit inrush current during plug-in, thermal shutdown to prevent catastrophic switch failure from high-current loads, and Under-Voltage Lockout (UVLO) to ensure that the device remains off unless there is a valid input voltage present. Besides, fault current is limited to specific current for FP6861E-A in single port in accordance with the USB power requirements. FP6861E-A will prevent reverse current with reverse voltage protection. FP6861E-A is available in SOT-23-6 and TDFN-6 (2mm×2mm) packages with smallest components.