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OM7603ST
ISOLATED HERMETIC TO-257AA ADJUSTABLE VOLTAGE REGULATOR
Three Terminal, Adjustable Voltage, 1.5 Amp Precision Negative Regulator In Hermetic JEDEC TO-257AA Package
FEATURES
* * * * * * * Isolated Hermetic Package, JEDEC TO-257AA Outline Adjustable Output Voltage Eliminates Stocking Fixed Voltages Built-In Thermal Overload Protection Short Circuit Current Limiting Product Is Available Screened To MIL-STD -883 Similar To Industry Standard P/N LM137
DESCRIPTION
This three terminal negative regulator is supplied in a hermetically sealed metal package whose outline is similar to the industry standard TO-220 plastic package. All protective features are designed into the circuit, including thermal shutdown, current limiting and safe-area control. With heat sinking, they can deliver over 1.0 amp of output current. This unit features output voltages that can be trimmed using external resistors, from -1.2 volts to -37 volts.
ABSOLUTE MAXIMUM RATINGS @ 25C
Input-Output Voltage Differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V Operating Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -55C to +150C Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Typical Power/Thermal Characteristics: Rated Power @ 25C TC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.5W TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3W Thermal Resistance qJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5C/W qJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42C/W
3.3
Note: This device is also available in a non-isolated JEDEC TO-257AA package. Use part number OM7603NT for non-isolated unit.
4 11 R4 Supersedes 1 07 R3
3.3 - 137
OM7603ST
ELECTRICAL CHARACTERISTICS
Parameter Reference Voltage Symbol VREF
-55C TA 125C, IL = 8mA (unless otherwise specified)
Min. -1.262 Max. -1.238 -1.220 -1.220 4.5 13.8 25 25 25 50 5 mV mV mV V Unit
Test Conditions VDIFF = 3.0V, TA = 25C VDIFF = 3.0V VDIFF = 40V
* * * *
-1.280 -1.280 -4.5 -13.8 -25 -25 -25
Line Regulation (Note 1) Load Regulation (Note 1)
RLINE
3.0 V
VDIFF 3.0V
40V, TA = 25C VDIFF 40V
RLOAD
VDIFF = 5V, 8mA IL 1.5A VDIFF = 12V, 8mA IL 1.5A, TA = 25C VDIFF 40V, 8mA IL 1.5A, TA = 25C
VDIFF = 40V, 8mA IL 1.5A Thermal Regulation VRTH Vin = -14.6V, IL = 1.5A Pd = 20 Watts, t = 10 ms, TA = 25C Ripple Rejection (Note 2) Adjustment Pin Current IAdj RN f = 120 Hz, Vout = Vref CAdj = 10 F, Iout = 100 mA VDIFF = 3.0V VDIFF = 40V Adjustment Pin Current Change IAdj (line) IAdj (load) Miminum Load Current ILmin VDIFF = 5V, 8mA IL 1.5A VDIFF = 3.0V, Vout = -1.4V (forced) VDIFF = 10V, Vout = -1.4V (forced) VDIFF = 40V, Vout = -1.4V (forced) Current Limit (Note 2) ICL VDIFF 5V 3V VDIFF 40V
*
-50 -5
* * * * * * * * *
66
dB
100 100 A
-5
5
A
-5
5 3.0 3.0 5.0
A
mA
1.5 0.24
3.5 1.2 A
VDIFF = 40V, TA = 25C
Notes: 1. Load and Line Regulation are specified at a constant junction temperature. Pulse testing with low duty cycle is used. Changes in output voltage due to heating effects must be taken into account separately. 2. If not tested, shall be guaranteed to the specified limits. 3. The * denotes the specifications which apply over the full operating temperature range.
3.3
3.3 - 138
OM7603ST
TYPICAL PERFORMANCE APPLICATIONS
LOAD REGULATION
0.2 0.2 4 4 0 0 -0.2 -0.2
CURRENT LIMIT
TJ = -55C TJ = -25C TJ = -150C 2
VO, Output Voltage Change (%)
IL = 0.5A IO, Output Current (A)
3 3
-0.4 -0.4 -0.6 -0.6 -0.8 -0.8 -1.0 -1.0
-1.2 -1.2 -1.4 -1.4 -50 -25 -75-50 -25 0 0 25 25 50 50 75 75 100 125 100 125 150 150
IL = 1.5A VI = -15V VO = -10V
1 1
0 0
0 0 10 10 20 20 30 30 40 40
TJ, Junction Temperature (C)
VI - VO, Input - Output Voltage Differential (Vdc)
ADJUSTMENT PIN CURRENT
80 80 IAdj, Adjustment Pin Current (A) 75 75 70 70 65 65 60 60 55 55 50 50
45 45 40 40 -50 -75 -50 -25 -25 0 0 25 25 50 50 75 100 125 150 75 100 125 150
DROPOUT VOLTAGE
VI - VO, Input - Output Voltage Differential (Vdc) 3.0 3.0 VO = -5V VO = 100mV 2.5 2.5 IL = 500mA IL = 1.5A
2.0 2.0 IL = 200mA
1.5 1.5
IL = 1.0A
IL = 20mA 1.0 1.0
-50 -50 -25 -25 0 0 25 25 50 50 75 100 125 150 75 100 125 150
TJ, Junction Temperature (C)
TJ, Junction Temperature (C)
TEMPERATURE STABILITY
1.270 IB, Quiescent Current (mA)
MINIMUM OPERATING CURRENT
1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 TJ = -55C TJ = 25C TJ = 150C
3.3
Vref, Reference Voltage (V)
1.260
1.250
1.240
1.230 -75 -50 -25 0 25 50 75 100 125 150
0 0 10 20 30 40 VI - VO, Input - Output Voltage Differential (Vdc)
TJ, Junction Temperature (C)
3.3 - 139
OM7603ST
TYPICAL APPLICATIONS
HIGH STABILITY REGULATOR
7V LM329B
+
DUAL TRACKING SUPPLY 1.25V TO 20V
+VI +
+
R2* 1F Solid Tantalum
OM7602ST VIN VOUT Adj 1F* R2 5K 1% R4 5k 1% R1** 100 1% R3 5K + 2.2* F
+VOU
1F Solid Tantalum Adj
R3 1.5K 1%
R1 1k 1%
D1 IN4002
+
10F
+
-VIN
VIN
VOUT
OM7603ST
*R2 =
(VOut) 9.08 x 10-3
-VOUT
10F
- 908
-VIN
+ -
1F* Adj VIN VOUT OM7603ST
R5** 100 1%
+ 2.2* F
D2 IN4002 -VOUT
* Solid Tantalum ** R1 or R5 may be trimmed slightly to improve tracking.
STANDARD APPLICATION
* CIN is required if regulator is located more than 4 inches from power supply filter. A 1F solid tantalum or 10F aluminum electrolytic is recommended.
+ IPRO R2 1.0F R1 120 CO* + 1.0F
** CO is necessary for stability. A 1F solid tantalum or 10F aluminum electrolytic is recommended. VOUT = -1.25V (1 + R2 ) VOUT = -1.25V (1 + R1
CIN*
IAd -VIN VI OM7603ST VOU -VOUT
MECHANICAL OUTLINE
.420 .410 .200 .190 .045 .035 .665 .645 .537 .527 .430 .410 .038 MAX.
PIN CONNECTION
Tab
3.3
.150 .140
.750 .500
.005
1
2
3
.035 .025
.100 TYP.
.120 TYP.
NOTES
* Case is metal/hermetically sealed * Isolated Tab
ISOLATED Front View Pin 1: Adjust Pin 2: Input Pin 3: Output Tab: Isolated
NON-ISOLATED Front View Pin 1: Adjust Pin 2: Input Pin 3: Output Tab: Input
205 Crawford Street, Leominster, MA 01453 USA (508) 534-5776 FAX (508) 537-4246

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