Datasheet > NCP345

NCP345

更新时间： 2024-11-07 22:40:15

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Overvoltage Protection IC

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NCP345 数据手册

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.

http://onsemi.com

THIN SOT−23−5

SN SUFFIX

CASE 483

PIN CONNECTIONS &

MARKING DIAGRAM

Features

OUT

GND

VCC

• 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

CNTRL

= Year

= Work Week

(Top View)

Typical Applications

• Cellular Phones

• Digital Cameras

• Portable Computers and PDAs

• Portable CD and other Consumer Electronics

ORDERING INFORMATION

†

Device

Package

Shipping

NCP345SNT1

SOT−23−5

3000 / Tape &

Reel

NCP345SNT1G

SOT−23−5

(Pb−Free)

(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.

Schottky

Diode

P−CH

AC/DC Adapter or

Accessory Charger

Undervoltage

Lock Out

−

LOAD

FET

Driver

Logic

OUT

ref

NCP345

CNTRL

Microprocessor port

Note: This device contains 89 active transistors

GND

Figure 1. Simplified Application Diagram

Semiconductor Components Industries, LLC, 2004

Publication Order Number:

December, 2004 − Rev. 5

NCP345/D

12 3 4 5 6 7 8

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