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PDF NCP346 Data sheet ( Hoja de datos )
| Número de pieza | NCP346 | |
| Descripción | Overvoltage Protection IC | |
| Fabricantes | ON | |
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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.
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 VCC, 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)
VCC
P−CH
Schottky
Diode
IN
(optional)
+
−
Logic
FET
Driver
OUT
+
C1 LOAD
Vref
NCP346
GND
CNTRL
Microprocessor port
Note: This device contains 89 active transistors
Figure 1. Simplified Application Diagram
Semiconductor Components Industries, LLC, 2004
December, 2004 − Rev. 4
1
Publication Order Number:
NCP346/D
1 page  
NCP346
ELECTRICAL CHARACTERISTICS (NCP346SN2T1)
(For typical values TA = 25°C, for min/max values TA = −40°C to +85°C unless otherwise noted.)
Characteristic
Pin Symbol
Min
VCC Operating Voltage Range
Total Supply Current (IN Connected to VCC; ON Mode, VCC = 5.0 V,
CNTRL Pin Floating, Steady State)
5 VCC(opt)
4, 5 Icc on
2.5
−
Total Supply Current (IN Connected to VCC; OFF Mode Driven by
CNTRL Pin, VCC = 5.0 V, VCNTRL = 1.5 V, Steady State)
Total Supply Current (IN Connected to VCC; OFF Mode Driven by
Overvoltage, VCC = 6.0 V, CNTRL Pin Floating, Steady State)
Input Threshold (IN Connected to VCC; VCC Increasing)
Input Threshold (IN Connected to VCC; VCC Decreasing)
Input Hysteresis (IN Connected to VCC)
Input Impedance of IN Pin
CNTRL Voltage High
CNTRL Voltage Low
CNTRL Current High (Vih = 5.0 V)
CNTRL Current Low (Vil = 0.5 V)
Output Voltage High (IN Connected to VCC, VCC = 6.0 V)
Isource = 10 mA
Isource = 0.25 mA
Isource = 0 mA
Output Voltage Low (IN Connected to VCC, VCC = 5.0 V, CNTRL Pin
Floating)
Isink = 0 mA
4, 5 Icc off
CNTRL
4, 5 Icc off IN
−
−
4 Vth (LH)
5.3
4 Vth (HL)
5.3
4 Vhyst
−
4 Rin
30
3 VIH
1.5
3 VIL
−
3 IIH
−
3 IIL
−
1 Voh
VCC − 1.0
VCC − 0.25
VCC − 0.1
1 Vol
−
Output Sink Current (IN Connected to VCC, VCC = 5.0 V, CNTRL Pin
Floating, VOUT = 1.0 V)
1
Isink
Turn ON Delay – Input (IN Connected to VCC; VCC Steps Down from 1 ton IN
6.0 V to 5.0 V, Cload = 12 nF, Measured to Vout < 1.0 V)
Turn OFF Delay – Input (IN Connected to VCC; VCC Steps Up from
5.0 V to 6.0 V, Cload = 12 nF, Measured to VOUT > VCC − 1.0 V)
1 toff IN
Turn OFF Delay – CNTRL (VCNTRL Steps Up from 0.5 V to 2.0 V, VCC
1
toff
= 5.0 V, Cload = 12 nF, Measured to VOUT > VCC − 1.0 V)
ICNTRL
4.0
−
−
−
Typ
−
650
700
750
5.5
5.45
50
60
−
−
95
9.0
−
−
10
1.8
0.5
0.6
Max
25
1200
1200
1200
5.7
5.7
−
100
−
0.5
200
20
−
Unit
V
mA
mA
mA
V
V
mV
kW
V
V
mA
mA
V
0.1 V
16 mA
4.5 msec
1.0 msec
1.0 msec
http://onsemi.com
5
5 Page 
NCP346
15
14
13
12
11
10
9
8
7
6
5
−40 −25 −10 5
20 35 50 65 80
AMBIENT TEMPERATURE (°C)
Figure 11. Typical OUT Sink Current vs.
Temperature (NCP346SN1)
95
15
14
13
12
11
10
9
8
7
6
5 −40
−25 −10
5
20 35 50 65 80
AMBIENT TEMPERATURE (°C)
Figure 12. Typical OUT Sink Current vs.
Temperature (NCP346SN2)
95
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11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet NCP346.PDF ] | |
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