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
xxx
Y
W
= SQZ for NCP346SN1
= SRD for NCP346SN2
= Year
= Work Week
5
V
CC
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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
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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)
+
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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
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Semiconductor Components Industries, LLC, 2004
December, 2004
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Rev. 4
1
Publication Order Number:
NCP346/D
NCP346相關型號PDF文件下載
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英文版
Voltage Detector Series
ONSEMI
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英文版
Voltage Detector Series
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