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
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MARKING
DIAGRAMS
14
1
SOIC−14
D SUFFIX
CASE 751A
1
NCP112DG
AWLYWW
•
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
1
PDIP−14
P SUFFIX
CASE 646
14
NCP112P
AWLYYWWG
1
Typical Applications
•
Personal Computer Switch Mode Power Supply Monitoring
•
Multi−Output Power Supplies Requiring System Supervision
A
WL
Y, YY
WW
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= 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.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Symbol
VS33
VS5
VS12
ADJ
PGI
CTUV
GND
VREF
REMOTE
CTREMOTE
CTPG
PGO
FAULT
VCC
Function
3.3 V SENSE INPUT
5.0 V SENSE INPUT
12 V SENSE INPUT
ADJUSTABLE OVP INPUT
POWER GOOD INPUT
ADJUSTABLE TIMING CAPACITOR
GROUND
VOLTAGE REFERENCE
REMOTE ON/OFF INPUT
ADJUSTABLE REMOTE ON/OFF
CAPACITOR
ADJUSTABLE POWER GOOD
CAPACITOR
POWER GOOD OUTPUT
FAULT OUTPUT
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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2
NCP112
V
CC
14
V
REF
VS33
VS5
VS12
1
2
3
OV
Detector
OV
Fault
Delay
V
CC
13
SET
FAULT
S
Q
R
CLR
Q
Remote
On/Off
Delay
3.4 V
UV
Detector
10
CTREMOTE
VREF
8
2.5 V
Reference
UV Blanking
Delay at
Power Up
-
+
9
+
-
1.28 V
REMOTE
1.28 V
4
+
-
1.28 V
5
PGI
ADJ
V
CC
GND
7
12
Power
Good
Delay
PGO
6
CTUV
11
CTPG
Figure 1. Block Diagram
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3
NCP112
MAXIMUM RATINGS
Rating
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)
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
Symbol
VCC
IPGO
IFAULT
IREF
ADJ, PGI, CTUV, REMOTE,
CTREMOTE, CTPG
PGO, FAULT
R
qJA
R
qJC
P
D
R
qJA
R
qJC
P
D
TJ
TA
Tstg
Value
18
30
30
20
VCC
18
100
45
1.25
125
30
1.0
+150
−40
to +125
−55
to +150
Unit
V
mA
mA
mA
V
V
°C/W
°C/W
W
°C/W
°C/W
W
°C
°C
°C
ELECTRICAL CHARACTERISTICS
(V
CC
= 5.0 V, T
A
= 25°C for typical values and T
A
= 0°C to 85°C for min and max values, unless
otherwise noted.)
Characteristic
OPERATING CONDITIONS
DC Power Supply
Power Supply Current
OVERVOLTAGE/UNDERVOLTAGE PROTECTION
Overvoltage Protection
3.3 V Output Sense
Hysteresis*
5.0 V Output Sense
Hysteresis*
12 V Output Sense
Hysteresis*
Undervoltage Protection
3.3 V Output Sense
Hysteresis*
5.0 V Output Sense
Hysteresis*
12 V Output Sense
Hysteresis*
VUV33
VUV
hys33
VUV5
VUV
hys5
VUV12
VUV
hys12
2.3
−
3.7
−
9.2
−
2.5
100
4.0
100
10
100
2.7
−
4.3
−
10.8
−
V
mV
V
mV
V
mV
VOV33
VOV
hys33
VOV5
VOV
hys5
VOV12
VOV
hys12
3.8
−
5.8
−
13.4
−
4.0
40
6.1
60
14.2
130
4.2
−
6.4
−
15
−
V
mV
V
mV
V
mV
V
CC
I
CC
4.5
−
−
3.0
16
5.0
V
mA
Symbol
Min
Typ
Max
Unit
*Hysteresis is measured in direction from threshold point back to nominal value of input voltage (i.e. 3.3 V, 5.0 V or 12 V).
1. This device contains ESD protection and exceeds the following tests:
Human Body Model JESD 22−A114−B: 2.0 kV
Machine Model JESD 22−A115−A: 200 V
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4
NCP112
ELECTRICAL CHARACTERISTICS
(continued)
(V
CC
= 5.0 V, T
A
= 25°C for typical values and T
A
= 0°C to 85°C for min and max
values, unless otherwise noted.)
Characteristic
OVERVOLTAGE/UNDERVOLTAGE PROTECTION (continued)
Undervoltage Protection
(continued)
Adjustable Overvoltage Protection Threshold
Hysteresis
UNDERVOLTAGE BLANKING DURING POWER UP
Undervoltage Blanking Time (CTUV = 100 nF)
Undervoltage Blanking Threshold Voltage (Pin 6)
POWER GOOD
Power Good Input Threshold Voltage
Power Good Input Hysteresis
Low State Open Collector Saturation Voltage
(I = 20 mA)
High State Open Collector Leakage Current
(V = 5.0 V)
Power Good Transient (See Application Note Section)
Rise Time
Fall Time
Adjustable Delay Time (CTPG = 100 nF)
Power Good Threshold Voltage (Pin 11)
FAULT
Fault Sink Current
Fault Saturation Voltage (I = 20 mA)
Fault Leakage Current (V = 5.0 V)
Fault Delay Time Before Latching
REMOTE CONTROL
Remote Input Voltage Threshold
Remote Hysteresis
Remote Pin Internal Pull−Up Voltage
Remote Low State Saturation Current
Remote Time Delay (C
TREMOTE
= 100 nF)
Remote On
Remote Off
Remote Delay Threshold Voltage (Pin 10)
Low Level
High Level
VOLTAGE REFERENCE
Internal Voltage Reference (I
O
= 1.0 mA) @ 25°C
Internal Voltage Reference (I
O
= 1.0 mA) 0°C to 85°C
Line Regulation (4.5 V < V
CC
< 16 V)
Iout = 0 mA
Iout = 10 mA
Load Regulation (V
CC
= 5.0 V)
0 mA < Iout < 10 mA
V
REF
V
REF
V
REFline
V
REFline
V
REFload
2.46
2.42
−
−
−
2.50
2.50
4.0
15
25
2.54
2.58
10
−
−
mV
V
mV
V
Rth
V
Rhys
V
Rh
I
Rl
T
REMon
T
REMoff
T
REMth lo
T
REMth hi
−
−
3.3
−
35
35
−
−
1.28
25
3.4
−
45
45
0.2
2.3
−
−
3.6
0.5
60
60
V
−
−
V
mV
V
mA
ms
I
FAULT
V
FAULTsat
I
FAULTleak
T
FAULT
20
−
−
−
−
−
−
100
−
0.4
1.0
−
mA
V
mA
ms
V
PGIth
V
PGIhys
V
Lsat
I
Hleak
−
−
−
−
1.28
25
−
−
−
−
0.4
1.0
V
mV
V
mA
ms
T
PGraise
T
PGfall
T
PG
T
PGth
−
−
100
−
1.0
1.0
300
2.5
−
−
500
−
ms
V
T
UV
T
UVth
100
−
300
2.5
500
−
ms
V
V
ADJth
V
ADJth
−
−
1.28
100
−
−
V
mV
Symbol
Min
Typ
Max
Unit
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