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NCP345

ON
Part Number NCP345
Manufacturer ON
Description Overvoltage Protection
Published May 12, 2005
Detailed Description NCP345 Overvoltage Protection IC The NCP345 overvoltage protection circuit (OVP) protects sensitive electronic circuitr...
Datasheet PDF File NCP345 PDF File

NCP345
NCP345


Overview
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 http://onsemi.
com 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 Package (Note: Microdot may be in either location) ORDERING INFORMATION Device Package Shipping† NCP345SNT1 SOT−23−5 NCP345SNT1G SOT−23−5 (Pb−Free) 3000 / Tape & Reel (7 inch Reel) †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
AC/DC Adapter or Accessory Charger P−CH Schottky Diode VCC IN Undervoltage Lock Out + − Logic FET Driver OUT + C1 LOAD Vref NCP3...


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