The LTC4361 controls a low cost external N-channel MOSFET so that under normal operation it provides a low loss path from the input to the load. Inrush current limiting is achieved by controlling the voltage slew rate of the gate. If the voltage at the input exceeds the overvoltage threshold of 5.8V, the GATE is pulled low within 1µs to protect the load. Fast shutdown time is important in situations where the device must react quickly to fast dV/dt overvoltages and where a slow response time would allow the high voltage to pass to the load when the gate of the NFET is fully enhanced. While the IC operates from supplies between 2.5V and 5.5V, the input pins can withstand 80V transients or DC overvoltages. The LTC4361 features a soft shutdown controlled by the ON# pin and provides a gate drive output (GATEP) for an optional external P-channel MOSFET for negative voltage protection. A power good output pin indicates gate turn on. Following an overvoltage condition, the LTC4361 automatically restarts with a start-up delay. The LTC4361 is available in two options; the LTC4361-1 latches off after an overcurrent event, whereas the LTC4361-2 performs an auto-retry following a 130ms delay. Both versions are available in 8-lead TSOT and 2mm x 2mm DFN packages.