CIRCUIT PROTECTION

摘要

Suiting USB charge protection in portable and consumer devices, the NCP361 overvoltage-protection controller uses an internal P-channel FET requiring no external devices. In the event of overvoltage from a wall adapter causing the input voltage to exceed the overvoltage shroud, the controller disconnects the output from the input, protecting the downstream system. Features include a 20-μA current consumption, a 750-mA typical overcurrent protection, and an improvement in VBUS protection of as much as 20V compared with discrete zener-based devices. A negative-going flag output alerts the system when a fault occurs, and an enable pin can force the device to an off-state. Available in a 2×2-mm uDFN- package, the NCP361 overvoltage-protection controller costs 40 cents (3000).