Overvoltage Protection
NCP345
Overvoltage Protection IC
The NCP345 overvoltage protection circuit (OVP) protects sensitive electronic circuitr...
Description
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 msec Accurate Voltage 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
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5 1
THIN SOT−23−5 SN SUFFIX CASE 483
PIN CONNECTIONS & MARKING DIAGRAM
RADAYWG G
OUT 1 GND 2
5 VCC
CNTRL 3
4 IN
(Top View)
RAD = Specific Device Code A = Assembly Location Y = Year W = Work Week G = Pb−Free ...
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