The NCP346 over voltage protection circuit protects sensitive electronic circuitry from power supply faults and over voltage transients when used in conjunction with an external P−channel field-effect transistor.
The device is optimized for applications that have an external AC/DC adapter or car accessory charger to power the product and/or recharge the internal batteries.
The device is designed to sense an overvoltage condition and quickly disconnect the input voltage supply from the load before any damage can occur. The over voltage protection consists of a precise voltage reference,control logic, a comparator with hysteresis, and a MOSFET gate driver.
The nominal overvoltage thresholds are 4.45 and 5.5 V and can be adjusted upward with a resistor divider between the IN, VCC, and GND pins. It is suitable for single cell Li−Ion applications as well as 3/4 cell NiCD/NiMH applications.
The overvoltage protection is designed on a robust BiCMOS process and is intended to withstand voltage transients up to 30 V.
Download datasheet [PDF]
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