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NCP345SNT1G PDF даташит

Спецификация NCP345SNT1G изготовлена ​​​​«ON» и имеет функцию, называемую «Overvoltage Protection IC».

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Номер произв NCP345SNT1G
Описание Overvoltage Protection IC
Производители ON
логотип ON логотип 

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NCP345SNT1G Даташит, Описание, Даташиты
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.
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−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 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
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5
1
THIN SOT−23−5
SN SUFFIX
CASE 483
PIN CONNECTIONS &
MARKING DIAGRAM
OUT 1
5 VCC
GND 2
CNTRL 3
4 IN
Y = Year
W = Work Week
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
NCP345SNT1 SOT−23−5
NCP345SNT1G SOT−23−5
(Pb−Free)
3000 / Tape &
Reel
(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
P−CH
Schottky
Diode
VCC
IN Undervoltage
Lock Out
+
Logic
FET
Driver
OUT
+
C1 LOAD
Vref
NCP345
GND
CNTRL
Microprocessor port
Note: This device contains 89 active transistors
Figure 1. Simplified Application Diagram
© Semiconductor Components Industries, LLC, 2004
December, 2004 − Rev. 5
1
Publication Order Number:
NCP345/D









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NCP345SNT1G Даташит, Описание, Даташиты
NCP345
VCC
(5)
IN
(4)
VCC V5
Pre−
regulator
R1
CNTRL
(3)
R2
Bandgap
Reference
+
COMP
R3
+
UVLO
R4
LOGIC
BLOCK
VCC
ON/OFF
OUT
DRIVER
OUT
(1)
GND
(2)
Figure 2. Detailed Block Diagram
PIN FUNCTION DESCRIPTIONS
Pin #
Symbol
Pin Description
1
OUT
This signal drives the gate of a P−channel MOSFET. It is controlled by the voltage level on IN or the logic state
of the CNTRL input. When an overvoltage event is detected, the OUT pin is driven to within 1.0 V of VCC in
less than 1.0 msec provided that gate and stray capacitance is less than 12 nF.
2
GND
Circuit Ground
3
CNTRL
This logic signal is used to control the state of OUT and turn−on/off the P−channel MOSFET. A logic High
results in the OUT signal being driven to within 1.0 V of VCC which disconnects the FET. If this pin is not used,
the input should be connected to ground.
4 IN This pin senses an external voltage point. If the voltage on this input rises above the overvoltage threshold
(VTH), the OUT pin will be driven to within 1.0 V of VCC, thus disconnecting the FET. The nominal threshold
level is 6.85 V and this threshold level can be increased with the addition of an external resistor between IN
and VCC.
5 VCC Positive Voltage supply. If VCC falls below 2.8 V (nom), the OUT pin will be driven to within 1.0 V of VCC, thus
disconnecting the P−channel FET.
TRUTH TABLE
IN
<Vth
<Vth
>Vth
>Vth
CNTRL
L
H
L
H
OUT
GND
VCC
VCC
VCC
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NCP345SNT1G Даташит, Описание, Даташиты
NCP345
ABSOLUTE MAXIMUM RATINGS (TA = 25°C unless otherwise noted.)
Rating
Pin Symbol Min Max Unit
OUT voltage to GND
Input and CNTRL pin voltage to GND
VCC Maximum Range
Maximum Power Dissipation at TA = 85°C
Thermal Resistance Junction to Air
Junction Temperature
Operating Ambient Temperature
VCNTRL Operating Voltage
Storage Temperature Range
ESD performance (HBM){
1 VO −0.3 30
4
Vinput
−0.3
30
3
VCNTRL
−0.3
13
V
V
5
VCC(max)
−0.3
30
V
PD
0.216
W
− RqJA − 300 °C/W
− TJ − 150 °C
TA
−40 85
°C
3 − 0 5.0 V
Tstg
−65 150
°C
all − 2.5 − kV
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
{ Human body model (HBM): MIL STD 883C Method 3015−7, (R = 1500 ohms, C = 100 pf, F = 3 pulses delay 1 s).
ELECTRICAL CHARACTERISTICS
(For typical values TA = 25°C, for min/max values TA = −40°C to +85°C, VCC = 6.0 V, unless otherwise noted.)
Characteristic
Symbol Pin
Min
Typ
VCC Operating Voltage Range
Supply Current (ICC + IInput; VCC = 6.0 V Steady State)
Input Threshold
(VInput connected to VCC; VInput increasing)
Input Hysteresis (VInput connected to VCC; VInput decreasing)
Input Impedance (Input = VTh)
CNTRL Voltage High
CNTRL Voltage Low
CNTRL Current High (Vih = 5.0 V)
CNTRL Current Low (Vil = 0.5 V)
Undervoltage Lockout (VCC decreasing)
Output Sink Current (VCC < VTh, VOUT = 1.0 V)
Output Voltage High (VCC = Vin = 8.0 V; ISource = 10 mA)
Output Voltage High (VCC = Vin = 8.0 V; ISource = 0.25 mA)
Output Voltage High (VCC = Vin = 8.0 V; ISource = 0 mA)
Output Voltage Low
(Input < 6.5 V; ISink = 0 mA; VCC = 6.0 V, CNTRL = 0 V)
Turn ON Delay − Input (VInput connected to VCC; VInput step down
signal from 8.0 to 6.0 V; measured to 50% point of OUT)*
VCC(opt)
VTh
VHyst
Rin
Vih
Vil
Iih
Iil
VLock
ISink
Voh
Vol
5 3.0
4,5 −
4
6.65
4 50
4 70
3 1.5
3−
3−
3−
3 2.5
1 10
1 VCC−1.0
VCC−0.25
VCC−0.1
1−
4.8
0.75
6.85
100
150
95
10
2.8
33
TON IN
1
Turn OFF Delay − Input (VInput connected to VCC; VInput step up signal TOFF IN
1
0.5
from 6.0 to 8.0 V; CL = 12 nF Output > VCC−1.0 V)
Turn ON Delay − CNTRL (CNTRL step down signal from 2.0 to 0.5 V;
measured to 50% point of OUT)*
TON CT
1
Turn OFF Delay − CNTRL (CNTRL step up signal from 0.5 to 2.0 V;
TOFF CT
1
1.0
CL = 12 nF Output > VCC−1.0 V)
*Turn ON Delay is guaranteed by design.
Max Unit
25 V
1.0 mA
V
7.08
200 mV
− kW
−V
0.5 V
200 mA
20 mA
3.0 V
50 mA
−V
0.1 V
10 msec
1.0 msec
10 msec
2.0 msec
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Номер в каталогеОписаниеПроизводители
NCP345SNT1Overvoltage Protection ICON
ON
NCP345SNT1GOvervoltage Protection ICON
ON

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