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NCP346SN1T1GONN/a1005avaiOver Voltage Supervisory IC for Adapter Input Protection
NCP346SN2T1GONN/a9270avaiOver Voltage Supervisory IC for Adapter Input Protection


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NCP346SN1T1G-NCP346SN2T1G
Over Voltage Supervisory IC for Adapter Input Protection
NCP346
Overvoltage Protection IC
The NCP346 Overvoltage Protection circuit (OVP) protectssensitive electronic circuitry from overvoltage transients and power
supply faults when used in conjunction with an external P−channelFET. The device is designed to sense an overvoltage condition and
quickly disconnect the input voltage supply from the load before anydamage 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 �sec Accurate V oltage 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
(optional)
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