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NCP345SNT1
Over Voltage Protection IC (6.85 V Threshold)
NCP345
Overvoltage Protection IC
The NCP345 overvoltage protection circuit (OVP) protects
sensitive electronic circuitry from overvoltage transients and power
supply faults when used in conjunction with an external P−channel
FET. 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 OVP consists of a precise voltage reference, a
comparator with hysteresis, control logic, and a MOSFET gate driver.
The OVP is designed on a robust BiCMOS process and is intended to
withstand voltage transients up to 30 V.
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 nominal overvoltage threshold is
6.85 V so it is suitable for single cell Li−Ion applications as well as 3/4
cell NiCD/NiMH applications.
Features Overvoltage Turn−Off Time of less than 1.0 �sec Accurate V oltage Threshold of 6.85 V (nominal) Undervoltage Lockout Protection CNTRL Input Compatible with 1.8 V Logic Levels Pb−Free Package is Available
Typical Applications Cellular Phones Digital Cameras Portable Computers and PDAs Portable CD and other Consumer Electronics
