TSM1121
3.3V 5V 12V HOUSEKEEPING IC
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Over voltage protection for 3.3V 5V and
12V without external components
Under voltage protection for 3.3V 5V and
12V without external components
Over voltage protection for -12V or -5V with
external components
Externally adjustable under voltage
blanking during power up
Power good input/output
Externally adjustable pg delay
Fault output
Remote output
Externally adjustable remote delay
Precision voltage reference
2kV ESD protection
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N
DIP14
(Plastic Package)
D
SO14
(Plastic Micropackage)
PIN CONNECTIONS (top view)
DESCRIPTION
The TSM1121 integrated circuit incorporates all
sensing circuitry to regulate and protect from over
voltage and under voltage a multiple output power
supply (3.3V, 5V and 12V).
TSM1121 incorporates all the necessary functions
for Housekeeping features which allow safe
operation in all conditions, and very high system
integration.
TSM1121 integrates a precise voltage reference.
VS33
1
14
VCC
VS5
2
13
FAULT
VS12
3
12
PG
EP
4
11
TPG
PI
5
10
TREM
TUV
6
9
REM
GND
7
8
VREF
APPLICATION
■
PC SMPS triple power line housekeeping ic
(3.3V 5V 12V)
ORDER CODE
Part
Number
Temperatur
e Range
TSM1121CN
TSM1121CD
0 to 85°C
0 to 85°C
Package
Marking
N
D
•
•
TSM1121C
M1121
Note: N = Dual in Line Package (DIP)
D = Small Outline Package (SO) - also available in Tape &
Reel (DT)
May 2003
Revision A
1/11
TSM1121
1
Pin Description
PIN DESCRIPTION
Name
Pin #
Vcc
Gnd
14
7
Vs12
Type
Function
3
Power Supply
Power Supply
Analog Input
Positive Power Supply Line
Ground Line. 0V Reference For All Voltages
Over and Under voltage Sense Input Dedicated to the 12V Line1
Vs5
2
Analog Input
Over and Under voltage Sense Input Dedicated to the 5V Line1)
Vs33
1
Analog Input
Tuv
Fault
PI
6
13
5
PG
12
Timing Capacitor
Open Collector
Analog Input
Open Collector
Tpg
11
REM
9
Trem
Vref
10
8
EP
4
Over and Under voltage Sense Input Dedicated to the 3.3V Line1)
Adjustable Under voltage Blanking Delay at Power Up (Setting Capacitor)
Fault Output. Fault is high when Over or Under Voltage has been Detected
Power Good Input. Detection of the Power Conditions
Power Good Output. PG output is High when the Power Conditions are
OK
Adjustable Power Good Delay (Setting Capacitor)
Input Remote Control of the Complete System by the Motherboard (µController). Remote is active high. Switch OFF/ON of the Power Supply. Reset
of the Complete System after a FAULT Activation.
Adjustable Remote Delay (Setting Capacitor).
2.5V Reference for all Voltages
Extra Protection Circuit. Can be used for -12V or -5V Over Voltage Protection.
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Timing Capacitor
Logic Input
Timing Capacitor
Voltage Reference
Analog Input
1) Over and Under Voltage Inputs can go higher than Vcc within the allowed Max Rating range
ABSOLUTE MAXIMUM RATINGS
Symbol
Vcc
Iout
Io
VFault
Pd
Tstg
ESD
Tuv
EP
PI
PG
Tpg
REM
Trem
DC Supply Voltage
1
DC Supply Voltage
Output Current Power Good
Output current for the Voltage reference
Fault Ouput
Power Dissipation
Storage Temperature
Electrostatic Discharge
Adjustable Under voltage Blanking At Power UP
Extra Protection
Power Good Input
Power Good Output
Adjustable Power Good Delay
Remote Control
Adjustable Remote Delay
Value
Unit
25
V
30
20
5
0.7
-55 to 150
2
5
5
5
5
5
5
5
mA
mA
V
W
°C
kV
V
V
V
V
V
V
V
Value
Unit
4.5 to 24
0 to 85
V
°C
1) All voltage values, except differential voltage are with respect to network ground terminal.
OPERATING CONDITIONS
Symbol
Vcc
Toper
2/11
Parameter
DC Supply Conditions
Operating Free Air Temperature Range
Electrical Characteristics
2
TSM1121
ELECTRICAL CHARACTERISTICS
Tamb = 25°C and Vcc = 17V (unless otherwise specified)
Symbol
Parameter
Test Condition
Min
Typ
Max
Unit
3
5
mA
4
4.2
V
6.1
6.4
V
14.2
15
V
2.3
4
10
1.28
100
2.5
4.3
10.8
Total Current Consumption
Icc
Total Supply Current
Vov33
Vov5
Vov12
Vuv33
Vuv5
Vuv12
Vep
Tfault
Over Voltage and Under Voltage Protection
Over Voltage Sense 3.3V
Input can go higher than
3.8
Vcc
Over Voltage Sense 5V
Input can go higher than
5.8
Vcc
Over Voltage Sense12V
Input can go higher than
13.4
Vcc
Under Voltage Sense 3.3V
2.1
Under Voltage Sense 5V
3.7
Under Voltage Sense 12V
9.2
Extra Over voltage Protection Threshold
Fault Delay Before Latching
Internally Fixed Delay
Under Voltage Blanking During Power Up
Under Voltage Blanking During Power
Up (Vcc rising)
Tuv
Thuv
t
e
l
o
Adjustable Blanking
Blanking Threshold
Power Good (PG)
Power Good Voltage Threshold
Power Good Voltage Threshold HysterVpghyst
esis
Low Output Open Collector Saturation
Vpgol
Voltage
High Output Open Collector Leakage
Ipgoh
Current
Tpgr
Power Good Output Rise Time
Tpgf
Power Good Output Fall Time
Tpg
Power Good Adjustable Delay
PIth
Power Input Detection Threshold
bs
Vpgth
(s)
ct
du
ete
Fault
Vfaultol
Ifaultoh
o
r
P
t
c
u
(s)
Fault Output Saturation Voltage Level
Fault Output Leakage Current Level
l
o
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d
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P
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-O
d
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P
e
Cuv = 2.2µF
100
1.28
Load Capacitor = 100pF
Load Capacitor = 100pF
Load Capacitor Cpg=2.2µF
100
IFault = 1mA
Vfault = 5V
V
V
V
V
µs
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t(
500
ms
d
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V
1.28
V
70
mV
P
e
let
o
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b
O
-
uc
300
Collector Current = 15mA
PG Output = 5V
t
c
u
(s)
1
1
300
1.28
0.4
V
1
µA
500
1
1
µs
µs
ms
V
V
µA
Remote Control (REM)
b
O
Vremth
t
e
l
o
Vremih
Iremil
bs
Trem1
O
Remote ON/OFF Input Voltage Threshold
High Input Remote Voltage
Low Input Remote Saturation Current
Remote Adjustable Delay ON to OFF
Load Capacitor
Crem=0.1µF
Remote Adjustable Delay OFF to ON
Load Capacitor
Crem=0.1µF
Trem2
0.7
0.8
3.3
3.4
1
V
0.5
V
mA
40
50
60
ms
40
50
60
ms
2.46
2.5
2.54
V
4
10
mV
Voltage Reference
Vref
Regline
Regline
Internal Voltage Reference
Line regulation
Io = 0mA
Io = 0mA
Line regulation
4.5V
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