NCP346

NCP346 Overvoltage Protection IC The NCP346 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 thresholds are 4.45 and 5.5 V and can be adjusted upward with a resistor divider between the VCC, IN, and GND pins. 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 msec Accurate Voltage Threshold of 4.45 V and 5.5 V (Nominal) CNTRL Input Compatible with 1.8 V Logic Levels These are Pb−Free Devices Typical Applications Cellular Phones Digital Cameras Portable Computers and PDAs Portable CD and other Consumer Electronics http://onsemi.com 5 1 THIN SOT−23−5 SN SUFFIX CASE 483 PIN CONNECTIONS & MARKING DIAGRAM xxxAYWG G OUT 1 GND 2 5 VCC CNTRL 3 4 IN (Top View) xxx = SQZ for NCP3...