NCP346 Datasheet, PDF (1/15 Pages) ON Semiconductor – Overvoltage Protection IC

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.
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−Ion applications as well as 3/4 cell NiCD/NiMH applications.
Features
• Overvoltage Turn−Off 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−Free Devices
Typical Applications
• Cellular Phones
• Digital Cameras
• Portable Computers and PDAs
• Portable CD and other Consumer Electronics
http://onsemi.com
5
1
THIN SOT−23−5
SN SUFFIX
CASE 483
PIN CONNECTIONS &
MARKING DIAGRAM
OUT 1
5 VCC
GND 2
CNTRL 3
4 IN
(Top View)
xxx = SQZ for NCP346SN1
xxx = SRD for NCP346SN2
Y = Year
W = Work Week
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.
AC/DC Adapter or
Accessory Charger
(optional)
V_CC
P−CH
Schottky
Diode
IN
(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, 2004
1
December, 2004 − Rev. 4
Publication Order Number:
NCP346/D