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Número de pieza NCP4350
Descripción Supervisory IC
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NCP4350
Supervisory IC for Desktop
Power Supply Monitoring
The NCP4350 provides all the necessary functions to monitor and
control a multi-output power supply providing fault protection
shutdown signals, and On/Off control. The NCP4350 provides the
ability to monitor the status of the +5 Vdc, +12 Vdc (A and B outputs),
and +3.3 Vdc output (voltage and current). The controller has built in
delay to prevent tripping during transient conditions to eliminate false
shutdowns.
OVP/UVP (OverVoltage/UnderVoltage Protection) monitors 3.3ĂV,
5ĂV, and dual 12ĂV to protect the power supply, FPOB output goes high
when one of these supply voltages exceed their limits.
OCP (OverCurrent Protection) monitors 3.3ĂV, 5ĂV, and dual 12ĂV
output current. Overcurrent limit is adjustable by IREF and current
protection resistor.
The PGI (Power Good Input) and OTP (OverTemperature
Protection) input pin provides the flexibility for design protection
circuit.
The PGO (Power Good Output) signal gives personal computer
notice when the output supplies are ready or power supply is going to
shutdown or fail, therefore it can provide a reliable power supply
environment.
Features
ăIndividual Overvoltage and Undervoltage Monitoring for +3.3ĂV,
+5ĂV, +12ĂVA, +12ĂVB Outputs and Lockout
ăIndividual Overcurrent Monitoring for +3.3ĂV, +5ĂV, +12ĂVA,
+12ĂVB Outputs and Lockout
ăFault Output with 5 mA of Sink Capability
ăRemote On/Off
ăPower Good Output Signal with 5 mA of Sink Capability
ăBuilt-in Delays for OVP, UVP, and Overload to avoid False Tripping
ăLow Power Consumption 10 mW at VCC = 5ĂV Typical
ăOvertemperature Input
ăWide Power Supply Range (4 V - 16 V)
Typical Applications
ăATX Computers
http://onsemi.com
MARKING DIAGRAM
SOIC-16
D SUFFIX
CASE 751B
NCP4350DG
AWLYWW
1
A = Assembly Location
WL = Wafer Lot
Y = Year
WW = Work Week
G = Pb-Free Device
PIN CONNECTIONS
PGI 1
GND 2
FPOB 3
PSONB 4
IS12A 5
RI 6
IS12B 7
VS12B 8
16 PGO
15 VCC
14 VS5
13 VS33
12 VS12A
11 IS33
10 IS5
9 OTP
(Top View)
ORDERING INFORMATION
Device
Package
Shipping{
NCP4350DR2G SOIC-16 3000/Tape & Reel
(Pb-Free)
†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.
©Ă Semiconductor Components Industries, LLC, 2007
September, 2007 - Rev. 0
1
Publication Order Number:
NCP4350/D

1 page




NCP4350 pdf
NCP4350
ELECTRICAL CHARACTERISTICS (VCC = 12V, for typical values TJ = 25°C, for min/max values, TJ = 0°C to +105°C,
Max TJ = 150°C, RI =33 kW, unless otherwise noted.)
Symbol
Rating
Min Typ Max
ICC Operating Supply Current (VCC = 16V, FPOBand PGO)
Overvoltage/Undervoltage Protection
- 1.5 2.0
V33OVP
V33OVPHYS
V5OVP
V5OVPHYS
V12OVP
(A and B)
+3.3V Output Overvoltage Threshold (includes VIO)
TJ =0°C to +105°C
Hysteresis (Note 3)
+5 V Output Overvoltage Threshold (includes VIO)
TJ =0°C to +105°C
Hysteresis (Note 3)
+12V Output Overvoltage Threshold (includes VIO)
TJ =0°C to +105°C
3.8 3.9 4.0
- 40 -
5.6 5.8 6.0
- 60 -
13.5 13.85 14.2
V12OVPHYS
(A and B)
Hysteresis (Note 3)
- 130 -
V33UVP
V33UVPHYS
V5UVP
V5UVPHYS
V12UVP
(A and B)
+3.3V Output Undervoltage Threshold (includes VIO)
TJ =0°C to +105°C
Hysteresis (Note 3)
+5 V Output Undervoltage Threshold (includes VIO)
TJ =0°C to +105°C
Hysteresis (Note 3)
+12V Output Undervoltage Threshold (includes VIO)
TJ =0°C to +105°C
2.8 2.9 3.0
- 30 -
4.2 4.4 4.6
- 45 -
10.3 10.65 11.0
V12UVPHYS Hysteresis (Note 3)
(A and B)
- 100 -
Interface I/O
VOLFPOB
Low Level Output Voltage Fault (ISink = 5 mA)
ILFAULT
Leakage Current (VDS= 5V)
VTHPGI
Input Voltage Threshold
VOLPGO
Low Level Output Voltage (ISink = 5 mA)
ILPGO
Leakage Current (VDS = 5V)
VOLPSONB
Low Level Input Voltage
VOHPSONB
High Level Input Voltage
VPSONBHYS PSONB Input Hysteresis
PSONBVIH Open Circuit Voltage (IIN = 0 mA)
ILPSONB
Input Pull-up Current (VPSONB = 0V)
Current Monitoring Comparators
0.4
10
1.18 1.25 1.32
0.4
10
0.8
2.0
300 -
-
2.5 5.25
120 170 220
IS12AVIO
IS12BVIO
IS33VIO
IS5VIO
AVOL
IIB
IREFGAIN
Input Offset Voltage 12VA Comparator, TJ = +25°C
Input Offset Voltage 12VB Comparator, TJ = +25°C
Input Offset Voltage 33V Comparator, TJ = +25°C
Input Offset Voltage 5V Comparator, TJ = +25°C
Voltage Gain (Note 3)
Input Bias Current (VIS12x = 12V, VIS5 = 5V, VIS33 = 3.3V)
The Gain of the IREF signal, RI=33 k ±0.1%, IREF = 1.25/RI,
TJ=+25°C
-4.0 4.0
-4.0 4.0
-4.0 4.0
-4.0 4.0
50 200
300 500
7.68 8.0 8.32
Unit
mA
V
mV
V
mV
V
mV
V
mV
V
mV
V
mV
V
mA
V
V
mA
V
V
mV
V
mA
mV
mV
mV
mV
V/mV
nA
http://onsemi.com
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