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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鈭抍hannel

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 V

CC

, IN, and GND pins. It is suitable for single cell

Li鈭捍on applications as well as 3/4 cell NiCD/NiMH applications.

Features

http://onsemi.com

THIN SOT鈭?3鈭?

SN SUFFIX

CASE 483

5

1

PIN CONNECTIONS &

MARKING DIAGRAM

OUT 1

xxxYW

GND

CNTRL

2

3

(Top View)

xxx

Y

W

= SQZ for NCP346SN1

= SRD for NCP346SN2

= Year

= Work Week

5

V

CC

鈥?/div>

Overvoltage Turn鈭扥ff 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鈭扚ree Devices

Cellular Phones

Digital Cameras

Portable Computers and PDAs

Portable CD and other Consumer Electronics

4

IN

Typical Applications

ORDERING INFORMATION

Device

Package

Shipping

鈥?/div>

3000 / Tape & Reel

(7 inch Reel)

NCP346SN1T1G SOT鈭?3鈭?

(Pb鈭扚ree)

NCP346SN2T1G

鈥燜or 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

AC/DC Adapter or

Accessory Charger

(optional)

IN

(optional)

+

鈭?/div>

V

ref

NCP346

GND

CNTRL

FET

Driver

V

CC

P鈭扖H

+

OUT

Logic

C1

LOAD

Microprocessor port

Note: This device contains 89 active transistors

Figure 1. Simplified Application Diagram

錚?/div>

Semiconductor Components Industries, LLC, 2004

December, 2004

鈭?/div>

Rev. 4

1

Publication Order Number:

NCP346/D

型號(hào)

版本

描述

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