Microsemi Corporation SG1548J, SG1548J-883B, SG1548J-DESC, SG1548L, SG1548L-883B Datasheet
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11/91 Rev 1.2 5/97 LINFINITY Microelectronics Inc.
Copyright 1997 11861 Western Avenue
∞ ∞
∞ ∞
∞ Garden Grove, CA 92841
1 (714) 898-8121
∞∞
∞∞
∞ FAX: (714) 893-2570
SG1548/SG2548/SG3548
QUAD POWER FAULT MONITOR
DESCRIPTION
The SG1548 is an integrated circuit capable of monitoring up to four
positive DC supply voltages simultaneously for overvoltage and
undervoltage fault conditions. An on-chip inverting op amp also
allows monitoring one negative DC voltage. The fault tolerance
window is accurately programmable from ±5% to ±40% using a simple
divider network on the 2.5V reference. A single external capacitor sets
the fault indication delay, eliminating false outputs due to switching
noise, logic transition current spikes, and short-term AC line interruptions. An additional comparator referenced to 2.5V allows the AC line
to be monitored for undervoltage conditions or for generation of a line
clock. The comparator can also be used for programmable
undervoltage lockout in a switching power supply. Uncommitted
collector and emitter outputs permit both inverting and non-inverting
operation. External availability of the precision 2.5V reference and
open-collector logic outputs permit expansion to monitor additional
voltage using available open-collector quad comparators.
FEATURES
••
••
• Monitors four DC voltages and the AC line
••
••
• Precision 2.5V ±1% low-drift reference
••
••
• Fault tolerance adjustable from ±5% to ±40%
••
••
• ±3% trip threshold tolerance over temperature
••
••
• Separate 10mA, 40V overvoltage, undervoltage
and AC line fault outputs
••
••
• Fault delay programmable with a single capacitor
••
••
• 30mV comparator hysteresis to prevent oscilla-
tions
••
••
• On-chip inverting op amp for negative voltage
••
••
• Open-collector output logic or expandability
••
••
• Operation from 4.5V to 40V supply
HIGH RELIABILITY FEATURES - SG1548
♦♦
♦♦
♦ Available to MIL-STD-883
♦♦
♦♦
♦ Radiation data available
♦♦
♦♦
♦ LMI level "S" processing available
BLOCK DIAGRAM
11/91 Rev 1.2 5/97 LINFINITY Microelectronics Inc.
Copyright 1997 11861 Western Avenue
∞ ∞
∞ ∞
∞ Garden Grove, CA 92841
2 (714) 898-8121
∞∞
∞∞
∞ FAX: (714) 893-2570
ABSOLUTE MAXIMUM RATINGS (Note 1)
SG1548/SG2548/SG3548
Inverting Op Amp Output Current ....................................
Operating Junction Temperature
Hermetic (J, L Packages) .............................................
Plastic (N, DW Packages) ............................................
Storage Temperature Range ............................
Lead Temperature ...........................................................
Supply Voltage (+VIN) ..........................................................
Fault Output Collector Voltage ............................................
Sense Input Voltage Range .................................
Fault Output Sink Current ................................................
Line Sense Input Current .................................................
Inverting Op Amp Input Current ........................................
40V
40V
-0.3V to 6.0V
20mA
±1mA
-5mA
25mA
150°C
150°C
-65°C to 150°C
300°C
Note 1. Values beyond which damage may occur.
THERMAL DATA
J Package:
Thermal Resistance-
Junction to Case, θ
JC
................... 30°C/W
Thermal Resistance-
Junction to Ambient, θ
JA
.............. 80°C/W
N Package:
Thermal Resistance-
Junction to Case, θ
JC
.................. 40°C/W
Thermal Resistance-
Junction to Ambient, θ
JA
............. 65°C/W
DW Package:
Thermal Resistance-
Junction to Case, θ
JC
.................. 40°C/W
Thermal Resistance-
Junction to Ambient, θ
JA
............. 95°C/W
L Package:
Thermal Resistance-
Junction to Case, θ
JC
.................. 35°C/W
Thermal Resistance-
Junction to Ambient, θ
JA
........... 120°C/W
Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).
Note B. The above numbers for
θJC are maximums for the limiting
thermal resistance of the package in a standard mounting configuration. The θ
JA
numbers are meant to be
guidelines for the thermal performance of the device/pcboard system. All of the above assume no ambient
airflow.
2.625
3.500
2.375
1.500
±0.6
100
DC Sense Inputs Section
V
PIN 1
= 0.95 x V
REF
V
PIN 1
= 0.60 x V
REF
V
PIN 1
= 0.95 x V
REF
V
PIN 1
= 0.60 x V
REF
V
SENSE
= 1.5V to 3.5V
+V
IN
= 4.5V to 35V
Overvoltage Threshold
Undervoltage Threshold
Input Bias Current
Threshold Supply Rejection
4.5V to 35V
5.0V to 35V
1.5V to 2.45V
±5% to ±40%
0 to 10mA
Supply Voltage Range
±25% Maximum Fault Window
(Note 3) ..............
±40% Maximum Fault Window ...........................
Lower Threshold Input Range .............................
Fault Tolerance Window Range ..........................
Fault Output Sink Current Range .............................
Line Sense Output Current Range ...........................
Voltage Reference Output Current ...........................
Operating Ambient Temperature Range
SG1548 .........................................................
SG2548 ...........................................................
SG3548 ...............................................................
0 to 10mA
0 to 10mA
-55°C to 125°C
-25°C to 85°C
0°C to 70°C
Note 2. Range over which the device is functional. Note 3. Limited by inverter amplifier positive swing at -55°C.
RECOMMENDED OPERATING CONDITIONS (Note 2)
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1548 with -55°C ≤ TA ≤ 125°C, SG2548 with
-25°C ≤ TA ≤ 85°C, SG3548 with 0°C ≤ TA ≤ 70°C, and +VIN = 15V. Low duty cycle pulse testing techniques are used which maintains junction and case
temperatures equal to the ambient temperature.)
Reference Section (Note 4)
TJ = 25°C
Over Temperature
+V
IN
= 4.5V to 35V
I
L
= 0 to 10mA
V
REF
= 0V
Output Voltage
Line Regulation
Load Regulation
Short Circuit Current
4.8+VIN = 40VSupply Current mA10
Min. Typ. Max.
SG3548SG1548/2548
Test ConditionsParameter Units
Supply Section
-0.4V
PIN 1
= 1.5V to 2.45VInput Bias Current µA
Fault Window Generator Section
Min. Typ. Max.
10 4.8
2.475
2.450
10
2.500
1
3
25
2.525
2.550
5
10
50
2.475
2.450
10
2.500
1
3
25
2.525
2.550
5
10
50
V
V
mV
mV
mA
-2.0 -0.4 -2.0
2.547
3.396
2.304
1.455
60
2.704
3.606
2.447
1.545
±2.0
2.547
3.396
2.304
1.455
60
2.625
3.500
2.375
1.500
±0.6
100
2.704
3.606
2.447
1.545
±2.0
V
V
V
V
µA
dB
Note 4. IL = 0mA
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