Document
NCP112
Supervisory IC for Desktop Power Supply Monitoring
The NCP112 is a highly integrated supervisory circuit that incorporates all the functions necessary for monitoring and controlling a multi−output switch−mode power supply system. The NCP112 provides an ability to monitor the status of the power supply outputs and communicate it to the system controller. The programmable output delays protect against spurious fault indicators.
Features
• Under and Overvoltage Protection for 3.3 V, 5.0 V and 12 V
Outputs
• Additional Adjustable Overvoltage Protection Input • Built−in Hysteresis on all Input Pins • Programmable Undervoltage Blanking During Power−Up • Fault Output with 20 mA Sink Capability • Programmable Remote On/Off Delay Time • Programmable Power Good Delay Time • Precision Voltage Reference with 20 mA Source Capability • Optimized for Low−Cost 100 nF Capacitors • Enhanced Replacement to the TSM112 • This is a Pb−Free Device
Typical Applications
• Personal Computer Switch Mode Power Supply Monitoring • Multi−Output Power Supplies Requiring System Supervision
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MARKING DIAGRAMS
14
1
SOIC−14
D SUFFIX CASE 751A
NCP112DG AWLYWW
1
14
1
PDIP−14
P SUFFIX CASE 646
NCP112P AWLYYWWG
1
A = Assembly Location
WL = Wafer Lot Y, YY = Year
WW = Work Week G = Pb−Free Package
PIN CONNECTIONS
VS33 VS5
VS12 ADJ PGI
CTUV GND
VCC FAULT PGO CTPG CTREMOTE REMOTE VREF
PDIP−14, SOIC−14
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet.
© Semiconductor Components Industries, LLC, 2009
August, 2009 − Rev. 4
1
Publication Order Number: NCP112/D
NCP112
PIN FUNCTION DESCRIPTION
Pin No.
Symbol
Function
1 VS33
3.3 V SENSE INPUT
2 VS5
5.0 V SENSE INPUT
3 VS12
12 V SENSE INPUT
4 ADJ
ADJUSTABLE OVP INPUT
5 PGI
POWER GOOD INPUT
6
CTUV
ADJUSTABLE TIMING CAPACITOR
7 GND
GROUND
8 VREF
VOLTAGE REFERENCE
9 REMOTE
REMOTE ON/OFF INPUT
10 CTREMOTE 11 CTPG 12 PGO
ADJUSTABLE REMOTE ON/OFF CAPACITOR
ADJUSTABLE POWER GOOD CAPACITOR
POWER GOOD OUTPUT
13 FAULT
FAULT OUTPUT
14 VCC
POWER SUPPLY VOLTAGE
Description Over/undervoltage sense input for 3.3 V. Over/undervoltage sense input for 5.0 V. Over/undervoltage sense input for 12 V. May be used for an additional overvoltage protection signal. Power good input signal. Adjustable undervoltage blanking delay during power−up. Ground Precision 2.5 V reference output. Input remote control from the microcontroller. Acts as a reset signal after a fault condition. Adjustable remote delay.
Adjustable power good delay.
Power good output. Active high when no fault conditions are present. Detects over/undervoltage conditions. Active high during a fault condition. Power supply voltage.
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1 VS33
2 VS5
3 VS12
VREF
OV Detector
UV Detector
8 VREF
2.5 V Reference
1.28 V 4 ADJ
7 GND
+ -
NCP112
VCC 14
OV
Fault Delay
VCC
SET
SQ R CLR Q
Remote
On/Off Delay
13 FAULT
10 CTREMOTE
3.4 V
UV Blanking Delay at Power Up
VCC
+ 1.28 V
9 REMOTE
+ 1.28 V
5 PGI
Power
Good Delay
12 PGO
6 CTUV
Figure 1. Block Diagram
11 CTPG
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NCP112
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage (Note 1) Power Good Output Current Fault Output Current Voltage Reference Output Current Voltage Rating (Pins 4, 5, 6, 9, 10, 11)
VCC IPGO IFAULT IREF ADJ, PGI, CTUV, REMOTE, CTREMOTE, CTPG
18 30 30 20 VCC
V mA mA mA V
Voltage Rating (Pins 12, 13) Power Dissipation and Thermal Characteristics (PDIP−14)
Thermal Resistance, Junction−to−Air Thermal Resistance, Junction−to−Case Maximum Power Dissipation @ 25°C Power Dissipation and Thermal Characteristics (SOIC−14) Thermal Resistance, Junction−to−Air Thermal Resistance, Junction−to−Case Maximum Power Dissipation @ 25°C Operating Junction Temperature Operating Ambient Temperature Storage Temperature Range
PGO, FAULT
RRPqqDJJAC
RRqqJJAC PD TJ TA Tstg
18
100 45 1.25
125 30 1.0 +150 −40 to +125 −55 to +150
V
°C/W °C/W
W
°C/W °C/W
W °C °C °C
ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = 25°C for typical values and TA = 0°C to 85°C for min and max values, unless otherwise noted.)
Characteristic
Symbol
Min Typ Max Unit
OPERATING CONDITIONS DC Power Supply Power Supply Current OVERVOLTAGE/UNDERVOLTAGE PROTECTION Overvoltage Protection
VCC
4.5 − 16
V
ICC − 3.0 5.0 mA
3.3 V Output Sense Hysteresis*
5.0 V Output Sense Hysteresis*
12 V Output Sense Hysteresis*
Undervoltage Protection
VOV33 VOVhys33
VOV5 VOVhys5
VOV12 VOVhys12
3.8 4.0 − 40
5.8 6.1 − 60
13.4 14.2 − 130
4.2 −
6.4 −
15 −
V mV
V mV
V mV
3.3 V Output Sense Hysteresis*
VUV33 VUVhys33
2.3 2.5 2.7 − 100 −
5.0 V Output Sense Hysteresis*
VUV5 VUVhys5
3.7 4.0 4.3 − 100 −
12 V Output Sense Hysteresis*
VUV12 VUVhys12
9.2 10 10.8 − 100 −
*Hysteresis is measured in direction from threshold point back to n.