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 threshold is
6.85 V so it is suitable for single cell Li鈭扞on applications as well as 3/4
cell NiCD/NiMH applications.
Features
http://onsemi.com
5
1
THIN SOT鈭?3鈭?
SN SUFFIX
CASE 483
PIN CONNECTIONS &
MARKING DIAGRAM
OUT 1
RADYW
GND
CNTRL
2
3
Y
W
5
VCC
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Overvoltage Turn鈭扥ff 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鈭扚ree Package is Available
4
IN
= Year
= Work Week
(Top View)
Typical Applications
Cellular Phones
Digital Cameras
Portable Computers and PDAs
Portable CD and other Consumer Electronics
ORDERING INFORMATION
Device
NCP345SNT1
NCP345SNT1G
Package
SOT鈭?3鈭?
SOT鈭?3鈭?
(Pb鈭扚ree)
Shipping
鈥?/div>
3000 / Tape &
Reel
(7 inch Reel)
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
V
CC
IN
+
鈭?/div>
V
ref
NCP345
GND
CNTRL
Undervoltage
Lock Out
P鈭扖H
+
Logic
FET
Driver
C1
OUT
LOAD
Microprocessor port
Note: This device contains 89 active transistors
Figure 1. Simplified Application Diagram
漏
Semiconductor Components Industries, LLC, 2004
1
December, 2004 鈭?Rev. 5
Publication Order Number:
NCP345/D
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