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SG1544/SG2544/SG3544
LOW-VOLTAGE SUPERVISORY CIRCUIT
DESCRIPTION
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. 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.
FEATURES
* 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
HIGH RELIABILITY FEATURES - SG1544
Available to MIL-STD-883 and DESC SMD LMI level "S" processing available
BLOCK DIAGRAM
4/90 Rev 1.1 2/94
Copyright (c) 1994
1
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1544/SG2544/SG3544
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 ............................ -65C to 50mA 150C 150C 150C
Note 1. Values beyond which damage may occur. Note 2. At higher input voltages, a dissipation limiting resistor, RG , is required. See Figure 1.
THERMAL DATA
J Package: Thermal Resistance-Junction to Case, JC .................. Thermal Resistance-Junction to Ambient, JA .............. N Package: Thermal Resistance-Junction to Case, JC .................. Thermal Resistance-Junction to Ambient, JA ............. DW Package: Thermal Resistance-Junction to Case, JC .................. Thermal Resistance-Junction to Ambient, JA ............. 25C/W 70C/W 30C/W 60C/W 35C/W 90C/W
Note A. Junction Temperature Calculation: TJ = TA + (PD x JA). Note B. The above numbers for JC are maximums for the limiting
thermal resistance of the package in a standard mounting configuration. The JA numbers are meant to be guidelines for the thermal performance of the device/pcboard system. All of the above assume no ambient airflow.
RECOMMENDED OPERATING CONDITIONS (Note
3)
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
Delay Timing Capcitor (Note 4) ..................................... 0 to 1F Operating Ambient Temperature Range SG1544 ......................................................... -55C to 125C SG2544 ........................................................... -25C to 85C SG3544 .............................................................. 0C to 70C
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 -55C TA 125C, SG2544 with -25C T A 85C, SG3544 with 0C TA 70C, and +VIN = 10V. Indicator outputs have 2k 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 = 25C to TMAX +VIN = 40V, Outputs open TJ = 25C +VIN = 5 to 30V IREF = 0 to 10mA VREF = 0V
SG1544/2544 SG3544 Units Min. Typ. Max. Min. Typ. Max. 4.5 4.7 7 40 40 10 4.5 4.7 7 40 40 10 V V mA V V mV mV mA %/C
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
4/90 Rev 1.1 2/94
Copyright (c) 1994
2
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1544/SG2544/SG3544
ELECTRICAL CHARACTERISTICS
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 TJ = 25C Sense input = 0V
(continued)
Test Conditions
SG1544/2544 SG3544 Units Min. Typ. Max. Min. Typ. Max. 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 2 400 300 500 400 0.1 0.8 6 0.8 6 100 12 400 10 200 13 0 0.4 2 0.4 2 400 300 500 400 0.1 0.8 6 0.8 6 V V mV A V V A V A ns ms mA V V mA V mA V mA/s ns ns V A mV mV dB dB V A MHz ns
VD = 0V IL = 10mA VIND = 40V VO.V. N.I. IN = 2.7V, VU.V. INV. IN = 2.3V, TJ = 25C CD = 0 CD = 1F +VIN = 5V, RG = 0, VO = 0 +VIN = 15V, IO = 100mA +VIN = 40V, RL = 1K REM. ACT. pin = Gnd REM. ACT pin open RESET pin = Gnd, REM. ACT. = Gnd RESET pin open, REM. ACT. = Gnd RL = 50, TJ = 25C, C D = 0 VREM. ACT. = 0.4V VO.V. N.I. INPUT = 2.7V
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
0 OFFSET/COMP pin open, VCM = 0V OFFSET/COMP pin open, VCM = 0V 10 from OFFSET/COMP pin to Gnd, TJ = 25C 0 VCM 12V, VIN = 15V OFFSET/COMP pin open, VCM = 0V IL = 10mA VIND = 40V AV = 0dB, TJ = 25C VOVERDRIVE = 100mV, TJ = 25C 0.3 0 100 70 80 0.2 .01 5 200
VIN-3V
0 0.3 0 100 70 80 0.2 .01 5 200
VIN -3V
80 60 72
1.0 10 120
70 60 72
1.0 15 130
0.5 1.0
0.5 1.0
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.
4/90 Rev 1.1 2/94
Copyright (c) 1994
3
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1544/SG2544/SG3544
CONNECTION DIAGRAMS & ORDERING INFORMATION
Package
18-PIN CERAMIC DIP J - PACKAGE (See Notes Below)
Part No. SG1544J/883B SG1544JDESC SG1544J SG2544J SG3544J SG2544N SG3544N
Ambient Temperature Range -55C to 125C -55C to 125C -55C to 125C -25C to 85C 0C to 70C -25C to 85C 0C to 70C
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
1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10
+VIN VREF GROUND C.L. OUTPUT OFFSET / COMP C.L. N.I. INPUT C.L. INV. INPUT U.V. INDICATE U.V. DELAY
18-PIN PLASTIC DIP N - PACKAGE
18-PIN WIDE BODY PLASTIC S.O.I.C. DW - PACKAGE
SG2544DW SG3544DW
-25C to 85C 0C to 70C
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
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 11 10
+VIN VREF GROUND C.L. OUTPUT OFFSET / COMP C.L. N.I. INPUT C.L. INV. INPUT U.V. INDICATE U.V. DELAY
Note 1. Contact factory for JAN and DESC product availablity. 2. All packages are viewed from the top. 4/90 Rev 1.1 2/94
Copyright (c) 1994
4
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.

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