MICROSEMI SG2544J

SG1544/SG2544/SG3544
LOW-VOLTAGE SUPERVISORY CIRCUIT
DESCRIPTION
FEATURES
This device was designed to provide all the operational features of the SG1543/
2543/3543 devices but with the added advantage of uncommitted inputs to the
voltage sensing comparators. This allows monitoring of voltage levels less than
2.5 volts by dividing down the internal reference supply.
• Uncommitted comparator inputs for
wide input flexibility
• Common-Mode range from zero to near
supply voltage
• Reference voltage trimmed to 1%
accuracy
• Over-voltage, under-voltage, and current
sensing circuits all included
• SCR "Crowbar" drive of 300mA
• Programmable time delays
• Open-collector outputs and remote
activation capability
• Total standby current less than 10mA
In all other respects, the SG1544 series is identical to the SG1543 series. These
monolithic devices contain all the functions necessary to monitor and control the
output of a sophisticated power supply system. Over-voltage sensing with
provision to trigger an external SCR “crowbar” shutdown; an under-voltage circuit
which can be used to monitor either the output or sample the input line voltage;
and a third op amp/comparator usable for current sensing are all included in this
IC, together with an independent, accurate reference generator.
The voltage-sensing input comparators are identical and can be used with
threshold levels from zero volts to (VIN - 3V). Each has approximately 25mv of
hysteresis which is offset so the switching differential threshold is zero on the noninverting input for rising levels and zero on the inverting input for falling signals.
All other operating characteristics are as described in the SG1543 data sheet and
application note.
HIGH RELIABILITY FEATURES
- SG1544
♦ Available to MIL-STD-883 and DESC
SMD
♦ LMI level "S" processing available
BLOCK DIAGRAM
Rev 1.1a 3.19.2005
Copyright  1994
Microsemi Inc.
1
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 ∞ FAX: (714) 893-2570
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (+VIN ) ................................................ 40V
Sense Inputs ...................................................................... +VIN
SCR Trigger Current (Note 2) ......................................... 300mA
Indicator Output Voltage ..................................................... 40V
Indicator Output Sink Current ..........................................
Operating Junction Temperature
Hermetic (J Package) ..................................................
Plasitc (N, DW Packages) .......................................
Storage Temperature Range ............................ -65°C to
50mA
150°C
150°C
150°C
Note 1. Values beyond which damage may occur.
Note 2. At higher input voltages, a dissipation limiting resistor, RG , is required. See Figure 1.
RoHS Peak Package Solder Reflow (40 sec. max. exp.)...260°C (+0, -5)
THERMAL DATA
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 .............
Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).
Note B. The above numbers for θ JC are maximums for the limiting
25°C/W
70°C/W
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.
30°C/W
60°C/W
35°C/W
90°C/W
RECOMMENDED OPERATING CONDITIONS (Note
3)
Delay Timing Capcitor (Note 4) ..................................... 0 to 1µF
Operating Ambient Temperature Range
SG1544 ......................................................... -55°C to 125°C
SG2544 ........................................................... -25°C to 85°C
SG3544 .............................................................. 0°C to 70°C
Input Supply Voltage (+VIN ) .................................... 4.7V to 40V
Current Limit Common Mode
Input Voltage Range ....................................... 0V to +VIN -3V
Reference Load Current ........................................... 0 to 10mA
Indicator Output Voltage ........................................ 4.7V to 40V
Indicator Output Current ........................................... 0 to 10mA
Note 3: Range over which the device is functional.
Note 4. Larger value capacitor may be used with peak current limiting. See Figure 1.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1544 with -55°C ≤ TA ≤ 125°C, SG2544 with
-25°C ≤ T A ≤ 85°C, SG3544 with 0°C ≤ TA ≤ 70°C, and +VIN = 10V. Indicator outputs have 2kΩ pull-up resistors. All electrical ratings and specifications
are tested with the inverting over-voltage input and the non-inverting under-voltage input externally connected to the 2.5V reference. Low duty cycle
testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter
Supply Section
Input Voltage Range
Supply Current
Reference Section
Output Voltage
Line Regulation
Load Regulation
Short Circuit Current
Temperature Stability
Test Conditions
TJ = 25°C to TMAX
4.5
4.7
+VIN = 40V, Outputs open
7
TJ = 25°C
40
40
10
4.5
4.7
7
40
40
10
2.48 2.50 2.52 2.45 2.50 2.55
2.45
2.55 2.40
2.60
1
5
1
5
1
10
1
10
12
25
40
12
25
40
.005
.005
+VIN = 5 to 30V
IREF = 0 to 10mA
VREF = 0V
Rev 1.1a
Copyright  1994
SG1544/2544
SG3544
Units
Min. Typ. Max. Min. Typ. Max.
2
V
V
mA
V
V
mV
mV
mA
%/°C
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 ∞ FAX: (714) 893-2570
ELECTRICAL CHARACTERISTICS
(continued)
Parameter
Comparator Section
Input Threshold (Note 5)
Input Hysteresis
Input Bias Current
Delay Saturation
Delay High Level
Delay Charging Current
Indicate Saturation
Indicate Leakage
Propagation Delay
SCR Trigger Section
Peak Output Current
Peak Output Voltage
Output Off Voltage
Remote Activate Current
Remote Activate Voltage
Reset Current
Reset Voltage
Output Current Rise Time
Prop. Delay from REM. ACT. Pin
Prop. Delay fom O.V. N.I. IN Pin
Current Limit Section
Input Voltage Range
Input Bias Current
Input Offset Voltage
CMRR
AVOL
Output Saturation
Output Leakage
Small Signal Bandwidth
Propagation Delay
SG1544/2544
SG3544
Units
Min. Typ. Max. Min. Typ. Max.
Test Conditions
TJ = 25°C
Sense input = 0V
VD = 0V
IL = 10mA
VIND = 40V
VO.V. N.I. IN = 2.7V, VU.V. INV. IN = 2.3V, TJ = 25°C
CD = 0
CD = 1µF
+VIN = 5V, RG = 0, VO = 0
+VIN = 15V, IO = 100mA
+VIN = 40V, RL = 1KΩ
REM. ACT. pin = Gnd
REM. ACT pin open
RESET pin = Gnd, REM. ACT. = Gnd
RESET pin open, REM. ACT. = Gnd
RL = 50Ω, TJ = 25°C, C D = 0
VREM. ACT. = 0.4V
VO.V. N.I. INPUT = 2.7V
2.45 2.50 2.55 2.40 2.50 2.60
2.40
2.60 2.35
2.65
25
25
0.3 1.0
0.3 1.0
0.2 0.5
0.2 0.5
6
8
6
8
200 250 300 200 250 300
0.2 0.5
0.2 0.5
.01 1.0
0.1 1.0
400
10
100
12
200
13
0
0.4
2
0.4
2
400
300
500
0
OFFSET/COMP pin open, VCM = 0V
OFFSET/COMP pin open, VCM = 0V
10Ω from OFFSET/COMP pin to Gnd, TJ = 25°C
0 ≤ VCM ≤ 12V, VIN = 15V
OFFSET/COMP pin open, VCM = 0V
IL = 10mA
VIND = 40V
AV = 0dB, TJ = 25°C
VOVERDRIVE = 100mV, TJ = 25°C
80
60
72
400
10
400
0.1
0.8
6
0.8
6
VIN-3V
0.3
0
100
70
80
0.2
.01
5
200
100
12
1.0
10
120
0.5
1.0
200
13
0
0.4
2
0.4
2
400
300
500
0
70
60
72
ns
ms
400
0.1
0.8
6
0.8
6
VIN -3V
0.3
0
100
70
80
0.2
.01
5
200
V
V
mV
µA
V
V
µA
V
µA
1.0
15
130
0.5
1.0
mA
V
V
mA
V
mA
V
mA/µs
ns
ns
V
µA
mV
mV
dB
dB
V
µA
MHz
ns
Note 5. Input voltage rising on O.V. N.I. INPUT and falling on U.V. INV. INPUT.
APPLICATION INFORMATION
SG1544
FIGURE 1 - SURGE LIMIT CIRCUIT FOR LARGE DELAY CAPACITORS
The 100 ohm resistor limits the peak discharge current into the SG1544 while the external PNP transistor provides a high peak-current
discharge path for the delay capacitor.
Rev 1.1a
Copyright  1994
3
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 ∞ FAX: (714) 893-2570
CONNECTION DIAGRAMS & ORDERING INFORMATION
Package
18-PIN CERAMIC DIP
J - PACKAGE
18-PIN PLASTIC DIP
N - PACKAGE
Part No.
SG1544J/883B
SG1544JDESC
SG1544J
SG2544J
SG3544J
SG2544N
SG3544N
(See Notes Below)
Ambient
Temperature Range
-55°C to 125°C
-55°C to 125°C
-55°C to 125°C
-25°C to 85°C
0°C to 70°C
-25°C to 85°C
0°C to 70°C
N Package: RoHS / Pb-free 100% Matte Tin lead Finish
18-PIN WIDE BODY
PLASTIC S.O.I.C.
DW - PACKAGE
SG2544DW
SG3544DW
-25°C to 85°C
0°C to 70°C
Connection Diagram
SCR TRIGGER
REMOTE ACTIVATE
RESET
O.V. INDICATE
O.V. DELAY
O.V. N.I. INPUT
O.V. INV. INPUT
U.V. N.I. INPUT
U.V. INV. INPUT
18
2
17
3
16
4
15
5
14
6
13
7
12
8
11
9
10
+VIN
VREF
GROUND
C.L. OUTPUT
OFFSET / COMP
C.L. N.I. INPUT
C.L. INV. INPUT
U.V. INDICATE
U.V. DELAY
N Package: RoHS Compliant / Pb-free Transition DC: 0503
SCR TRIGGER
REMOTE ACTIVATE
RESET
O.V. INDICATE
O.V. DELAY
O.V. N.I. INPUT
O.V. INV. INPUT
U.V. N.I. INPUT
U.V. INV. INPUT
DW Package: RoHS / Pb-free 100% Matte Tin lead Finish
1
1
18
+VIN
2
17
3
16
4
15
5
14
6
13
VREF
GROUND
C.L. OUTPUT
OFFSET / COMP
C.L. N.I. INPUT
7
12
8
11
9
10
C.L. INV. INPUT
U.V. INDICATE
U.V. DELAY
DW Package: RoHS Compliant / Pb-free Transition DC: 0516
Note 1. Contact factory for JAN and DESC product availablity.
2. All packages are viewed from the top.
Rev 1.1a
Copyright  1994
4
11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 ∞ FAX: (714) 893-2570