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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.
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 threshold is
6.85 V so it is suitable for single cell Li?Ion applications as well as 3/4
PIN CONNECTIONS &
MARKING DIAGRAM
cell NiCD/NiMH applications.
OUT 1
5
V CC
Features
? Overvoltage Turn?Off Time of less than 1.0 m sec
? 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
GND 2
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 3000 / Tape &
Reel
NCP345SNT1G
SOT?23?5
(7 inch Reel)
(Pb?Free)
?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
IN
V CC
Undervoltage
Lock Out
P?CH
Diode
+
?
Logic
FET
Driver
OUT
+
C1
LOAD
V ref
NCP345
GND
CNTRL
Microprocessor port
Note: This device contains 89 active transistors
Figure 1. Simplified Application Diagram
? Semiconductor Components Industries, LLC, 2006
March, 2006 ? Rev. 6
1
Publication Order Number:
NCP345/D
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