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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?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.
http://onsemi.com
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
5
1
THIN SOT?23?5
SN SUFFIX
CASE 483
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
PIN CONNECTIONS &
MARKING DIAGRAM
between the V CC , IN, and GND pins. It is suitable for single cell
OUT 1
5
V CC
Li?Ion applications as well as 3/4 cell NiCD/NiMH applications.
GND
2
Features
? Overvoltage Turn?Off Time of Less Than 1.0 m sec
? Accurate Voltage 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
CNTRL 3 4 IN
(Top View)
xxx = SQZ for NCP346SN1
= SRD for NCP346SN2
A = Asembly Location
Y = Year
W = Work Week
G = Pb?Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device Package Shipping ?
NCP346SN1T1G SOT?23?5
3000 / Tape & Reel
NCP346SN2T1G
(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
AC/DC Adapter or
Accessory Charger
(optional)
IN
V CC
P?CH
Diode
(optional)
+
?
Logic
FET
Driver
OUT
+
C1
LOAD
V ref
NCP346
GND
CNTRL
Microprocessor port
Note: This device contains 89 active transistors
Figure 1. Simplified Application Diagram
? Semiconductor Components Industries, LLC, 2006
September, 2006 ? Rev. 6
1
Publication Order Number:
NCP346/D
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