Microsemi Corporation SG1544J, SG1544J-883B, SG1544J-DESC, SG2544DW, SG2544J Datasheet

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

LINFINITY Microelectronics Inc.

Copyright ã 1994	11861 Western Avenue ∞ Garden Grove, CA 92841
1	[phone] ∞ FAX: [phone]

SG1544/SG2544/SG3544

ABSOLUTE MAXIMUM RATINGS (Note 1)

Input Supply Voltage (+VIN) ................................................

40V

Indicator Output Sink Current ..........................................

50mA

Sense Inputs ......................................................................

+VIN

Operating Junction Temperature

150°C

SCR Trigger Current (Note 2) .........................................

300mA

Hermetic (J Package)

..................................................

Indicator Output Voltage .....................................................

40V

Plasitc (N, DW Packages) .......................................

150°C

Note 1. Values beyond which damage may occur.

Storage Temperature Range ............................

-65°C to 150°C

Note 2. At higher input voltages, a dissipation limiting resistor, RG , is required. See Figure 1.

THERMAL DATA

J Package:

Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).

Thermal Resistance-Junction to Case, θJC ..................

25°C/W

Thermal Resistance-Junction to Ambient, θJA .............. 70°C/W

Note B. The above numbers for θJC are maximums for the limiting

N Package:

thermal resistance of the package in a standard mount-

Thermal Resistance-Junction to Case, θJC ..................

30°C/W

ing configuration. The

θJA

numbers are meant to be

Thermal Resistance-Junction to Ambient, θJA .............

60°C/W

guidelines for the thermal performance of the device/pc-

DW Package:

board system. All of the above assume no ambient

Thermal Resistance-Junction to Case, θJC ..................

35°C/W

airflow.

Thermal Resistance-Junction to Ambient, θJA .............

90°C/W

RECOMMENDED OPERATING CONDITIONS (Note 3)

0 to 1μF

Input Supply Voltage (+VIN) ....................................

4.7V to 40V

Delay Timing Capcitor (Note 4)

.....................................

Current Limit Common Mode

Operating Ambient Temperature Range

-55°C to 125°C

Input Voltage Range .......................................

0V to +VIN -3V

SG1544 .........................................................

Reference Load Current ...........................................

0 to 10mA

SG2544 ...........................................................

-25°C to 85°C

Indicator Output Voltage ........................................

4.7V to 40V

SG3544 ..............................................................

0°C to 70°C

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 ≤ TA ≤ 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

Test Conditions

SG1544/2544

SG3544

Units

Min.

Typ.

Max.

Min.

Typ.

Max.

Supply Section

Input Voltage Range

TJ = 25°C to TMAX

4.5

40

4.5

40

V

4.7

40

4.7

40

V

Supply Current

+VIN = 40V, Outputs open

7

10

7

10

mA

Reference Section

Output Voltage

TJ = 25°C

2.48

2.50

2.52

2.45

2.50

2.55

V

2.45

2.55

2.40

2.60

V

Line Regulation

+VIN = 5 to 30V

1

5

1

5

mV

Load Regulation

IREF = 0 to 10mA

1

10

1

10

mV

Short Circuit Current

VREF = 0V

12

25

40

12

25

40

mA

Temperature Stability

.005

.005

%/°C

4/90 Rev 1.1 2/94

LINFINITY Microelectronics Inc.

Copyright ã 1994	11861 Western Avenue ∞ Garden Grove, CA 92841
2	[phone] ∞ FAX: [phone]