PHOENIX ON Semiconductor has introduced its NCP345, an analog overvoltage protection IC in a 5-pin thin small-outline package, optimized for applications with an external ac/dc adapter or car accessory charger.
The chip monitors input voltage from the charger and disconnects the external MOSFET when the supply voltage exceeds the nominal threshold voltage of 6.85 volts.
Laurent Jenck, marketing manager for analog ICs at ON, said the NCP345 is suitable for single-cell lithium-ion, and three- and four-cell nickel-cadmium and nickel metal hydride applications.
The IC is manufactured in a BiCMOS process and can withstand transients up to 30 volts. Features include a CNTRL input that is compatible with 1.8-V logic levels, an over-voltage turn-off time of less than 1 microsecond, under-voltage lockout protection, a precise voltage reference, a comparator with hysteresis, control logic and a MOSFET gate. The NCP345SNT1 costs 50 cents each in quantities of 12,000.
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EETInfo No. 602