Over-voltage protection for USB charging

6 August 2008 Circuit & System Protection

ON Semiconductor has introduced the NCP361 – an integrated over-voltage protector dedicated to USB charging applications for portable and consumer devices, such as cellphones and MP3 players, set-top boxes and computers.

The NCP361 uses an internal P-channel FET, making an external device unnecessary and thus reducing the system cost and the printed circuit board area of the application board. If over-voltage from a wall adapter occurs, causing the input voltage to exceed the over-voltage threshold, the device instantaneously disconnects the output from the input to protect the downstream system for optimal protection. It offers low quiescent current and very low current consumption at 20 μA.

For added protection, the NCP361 features over-current protection at 750 mA. It has a negative-going flag output which alerts the system that a fault has occurred. The enable pin allows this overvoltage protection (OVP) device to be forced to an off-state. It also offers protection of VBUS up to +20 V, a more precise voltage threshold than discrete zener-based devices.

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