SG1548
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 Oscillations
On-Chip Inverting
Op-Amp
for Negative Voltage
Open-Collector Output Logic or Expandability
Operation from 4.5V to 40V Supply
High Reliability Features
Following are the high reliability features of SG1548:
Available to MIL-STD-883, ¶ 1.2.1
Radiation data available
MSC-AMS
level "S" processing available
Block Diagram
Figure 1 ·
Block Diagram
December
2014 Rev. 1.3a
www.microsemi.com
© 2014 Microsemi Corporation
1
QUAD POWER FAULT MONITOR
Connection Diagrams and Ordering Information
Ambient
Temperature
Type
Package
Part Number
SG1548J-883B
CERDIP
SG1548J
Packaging
Type
Connection Diagram
-55°C to 125°C
J
16-PIN
CERAMIC
DIP
LOWER THRESHOLD
GROUND
V
REF
+V
IN
LINE SENSE
EMITTER OUTPUT
COLLECTOR OUTPUT
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
-25°C to 85°C
N
SG2548N*
16-PIN
PLASTIC
DIP
PDIP
SG3548N*
INV. OUTPUT
INV. INPUT
SENSE 4
SENSE 3
SENSE 2
SENSE 1
U.V. FAULT
O.V. FAULT
DELAY
0°C to 70°C
N package: Pb-free / RoHS 100% Matte Tin Lead Finish
-25°C to 85°C
DW
0°C to 70°C
16-PIN
SMALL-
OUTLINE
WIDE
BODY
SG2548DW*
SOWB
LOWER THRESHOLD
GROUND
V
REF
+V
IN
LINE SENSE
EMITTER OUTPUT
COLLECTOR OUTPUT
DELAY
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
INV. OUTPUT
INV. INPUT
SENSE 4
SENSE 3
SENSE 2
SENSE 1
U.V. FAULT
O.V. FAULT
SG3548DW*
DW package: Pb-free / RoHS 100% Matte Tin Lead Finish
1. N.C.
2. LOWER THRESHOLD
3. GROUND
4
4. V
REF
5
5. +V
IN
6. N.C.
6
7. LINE SENSE
7
8. EMITTER OUTPUT
8
9. COLLECTOR
OUTPUT
10.DELAY
3
2
1
20 19
-55°C to 125°C
L
20-PIN
CERAMIC
(LCC)
SG1548L-883B
CLCC
SG1548L
18
17
16
15
14
9
10 11 12 13
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
N.C.
O.V. FAULT
U.V. FAULT
SENSE 1
SENSE 2
N.C.
SENSE 3
SENSE 4
INV. INPUT
INV. OUTPUT
Notes:
1. Contact factory for DESC product availability.
2. All parts are viewed from the top.
3. Hermetic Packages J & L use Pb37/Sn63 hot solder lead finish, contact factory for availability of RoHS versions.
*RoHS Compliant
2
Absolute Maximum Ratings1
Absolute Maximum Ratings
1
Parameter
Supply Voltage (+V
IN
)
Fault Output Collector Voltage
Sense Input Voltage Range
Fault Output Sink Current
Line Sense Input Current
Inverting Op Amp Input Current
Inverting Op Amp Output Current
Operating Junction Temperature
Hermetic (J, L Packages)
Plastic (N, DW Packages)
Storage Temperature Range
Value
40
40
-0.3V to 6.0V
20
±1
-5
25
150
150
-65 to 150
Units
V
V
V
mA
mA
mA
mA
°C
°C
°C
°C
Lead Temperature
300
Notes:
1.
Values beyond which damage may occur.
2.
Pb-free / RoHS Peak Package Solder Reflow Temp. (40 second max. exposure). 260°C (+0, -5)
Thermal Data
Parameter
J Package
Thermal Resistance-Junction to Case,
θ
JC
Thermal Resistance-Junction to Ambient,
θ
JA
N Package
Thermal Resistance-Junction to Case,
θ
JC
Thermal Resistance-Junction to Ambient,
θ
JA
DW Package
Thermal Resistance-Junction to Case,
θ
JC
Thermal Resistance-Junction to Ambient,
θ
JA
L Package
Thermal Resistance-Junction to Case,
θ
JC
30
80
40
65
40
95
35
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
Value
Units
Thermal Resistance-Junction to Ambient,
θ
JA
120
°C/W
Notes:
1. Junction Temperature Calculation: T
J
= T
A
+ (P
D
×
θ
JA
).
2. The above numbers for
θ
JC
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/pc-board system. All of
the above assume no ambient airflow.
3
QUAD POWER FAULT MONITOR
Recommended Operating Conditions
1
Supply Voltage Range
±25% Maximum Fault Window
±40% Maximum Fault Window
Lower Threshold Input Range
(2)
Value
4.5 to 35
5.0 to 35
1.5 to 2.45
±5 to ±40
0 to 10
0 to 10
0 to 10
-55 to 125
-25 to 85
0 to 70
Units
V
V
V
%
mA
mA
mA
°C
°C
°C
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
Notes:
1. Range over which the device is functional.
2. Limited by inverter amplifier positive swing at -55°C.
4
Electrical Characteristics
Electrical Characteristics
Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1548
with -55°C
≤
T
A
≤
125°C, SG2548 with
-25°C
≤
T
A
≤
85°C, SG3548 with 0°C
≤
T
A
≤
70°C, and +V
IN
= 15V.
Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to
the ambient temperature.
Parameter
Supply Section
Supply Current
(1)
Reference Section
Output Voltage
Test Conditions
SG1548/2548
Min Typ Max
4.8
10
2.475
2.450
SG3548
Min
Typ
Max
4.8
2.500
1
3
25
-0.4
2.547
3.396
2.304
1.455
60
1.200
32.5
2.625
3.500
2.375
1.500
±0.6
100
10
2.525
2.550
5
10
50
-2.0
2.704
3.606
2.447
1.545
±2.0
Units
+V
IN
= 40V
T
J
= 25°C
Over Temperature
+V
IN
= 4.5V to 35V
I
L
= 0 to 10mA
V
REF
= 0V
mA
V
V
mV
mV
mA
µA
V
V
V
V
µA
dB
V
mV
µA
V
V
mV
µA
V
V
dB
mA
dB
V
mV
µA
µA
V
V
V
V
µA
V
Line Regulation
Load Regulation
Short Circuit Current
Fault Window Generator Section
Input Bias Current
V
PIN 1
= 1.5V to 2.45V
DC Sense Inputs Section
Overvoltage Threshold
V
PIN 1
= 0.95 x V
REF
V
PIN 1
= 0.60 x V
REF
Undervoltage Threshold
V
PIN 1
= 0.95 x V
REF
V
PIN 1
= 0.60 x V
REF
Input Bias Current
V
SENSE
= 1.5V to 3.5V
Threshold Supply Rejection
+V
IN
= 4.5V to 35V
Fault Delay Section
Comparator Threshold
Comparator Hysteresis
Delay Charging Current
V
PIN 8
= 0V
On Saturation Voltage
I
PIN 8
= 0mA
OFF Clamp Voltage
I
PIN 8
= 0mA
(2)
Inverting Op Amp Section
Input Offset Voltage
Input Bias Current
Output High Voltage
I
SOURCE
= 5mA
Output Low Voltage
I
SINK
= 5mA
Large Signal Voltage Gain
R
L
= 10k
Output Source Current
Power Supply Rejection Ratio
+V
IN
= 4.5V to 35V
AC Line Sense Section
Comparator Threshold
V
PIN 5
= Low to High
Comparator Hysteresis
Input Bias Current
V
PIN 5
= 2.5V
Collector Leakage Current
V
CE
= 40V
Collector Saturation Voltage
I
C
= 10mA
Emitter Output Voltage
I
E
= 10mA
Diode Clamp Voltage
I
PIN 5
= 1mA
I
PIN 5
= -1mA
Fault Logic Outputs (Each output)
Collector Leakage Current
V
C
= 40V
Collector Saturation Voltage
I
C
= 10mA
Notes:
1.
I
L
= 0mA
2. +V
IN
= 4.5V.
2.475 2.500 2.525
2.450
2.550
1
5
3
10
10
25
50
-0.4
2.547
3.396
2.304
1.455
60
2.625
3.500
2.375
1.500
±0.6
100
-2.0
2.704
3.606
2.447
1.545
±2.0
10
1.200 1.250 1.300
25
32.5
50
67.5
0.1
0.2
+3.2 +3.6
2
-0.3
3.5
1.0
100
15
100
15
-1.0
1.250 1.300
25
50
67.5
0.1
0.2
+3.2 +3.6
2
-0.3
3.5
1.0
100
15
100
2.500
25
1
1
0.2
13
15
-1.0
1.9
25
3.2
72
5
72
3.2
1.9
25
72
5
72
2.440
2.440 2.500 2.560
25
1
2
1
10
0.2
0.5
12
13
6.0
7.5
-0.3
-1.0
1
0.2
10
0.5
2.560
2
10
0.5
7.5
-1.0
12
6.0
-0.3
1
0.2
10
0.5
5
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