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ISOLATED HERMETIC TO-257AA
ADJUST ABLE V OL T A GE REGULA TOR
Three T erminal, Adjustable V oltage, 1.5 Amp
Precision Negative Regulator In Hermetic
JEDEC TO-257AA P ackage
FEA TURES
• 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
OM7603ST
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 @ 25°C
Input-Output Voltage Differential ...........................................40V
Operating Junction Temperature Range .........................-55°C to +150°C
Storage Temperature Range.....................................-65° to +150°C
Typical Power/Thermal Characteristics:
Rated Power @ 25°C
TC..............................................................17.5W
TA.................................................................3W
Thermal Resistance
qJC............................................................3.5°C/W
qJA.............................................................42°C/W
Note: This device is also available in a non-isolated JEDEC TO-257AA package.
Use part number OM7603NT for non-isolated unit.
3.3
4 11 R4
Supersedes 1 07 R3
3.3 - 137
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OM7603ST
ELECTRICAL CHARACTERISTICS -55°C T
125°C, IL= 8mA (unless otherwise specified)
A
Parameter Symbol Test Conditions Min. Max. Unit
Reference Voltage V
Line Regulation R
REF
LINE
(Note 1) 3.0V V
Load Regulation R
LOAD
(Note 1) V
Thermal Regulation V
Ripple Rejection R
RTH
N
(Note 2) C
Adjustment Pin Current I
Adjustment Pin ³I
Adj
Adj
Current Change (line) 3V V
³I
Adj
(load) V
Miminum Load Current I
Current Limit I
Lmin
CL
(Note 2) V
V
= 3.0V, TA= 25°C -1.262 -1.238
DIFF
V
= 3.0V • -1.280 -1.220 V
DIFF
V
= 40V • -1.280 -1.220
DIFF
3.0 V V
V
DIFF
= 12V, 8mA I
DIFF
V
40V, 8mA IL 1.5A, TA= 25°C -25 25
DIFF
V
DIFF
40V, TA= 25°C -4.5 4.5
DIFF
40V • -13.8 13.8 mV
DIFF
= 5V, 8mA I
= 40V, 8mA I
1.5A • -25 25
L
1.5A, TA= 25°C -25 25 mV
L
1.5A • -50 50
L
Vin= -14.6V, IL= 1.5A -5 5 mV
P
= 20 Watts, t = 10 ms, TA= 25°C
d
V
DIFF
V
DIFF
V
DIFF
f = 120 Hz, V
= 10 µF, I
Adj
V
V
= 5V, 8mA IL 1.5A • -5 5 µA
DIFF
= 3.0V, V
= 10V, V
= 40V, V
V
DIFF
= V
out
ref
= 100 mA
out
= 3.0V • 100
DIFF
= 40V • 100 µA
DIFF
40V • -5 5 µA
DIFF
= -1.4V (forced) • 3.0
out
= -1.4V (forced) • 3.0 mA
out
t = -1.4V (forced) • 5.0
ou
5V • 1.5 3.5
DIFF
• 66 dB
= 40V, TA= 25°C 0.24 1.2 A
3.3
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 - 138
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TYPICAL PERFORMANCE APPLICATIONS
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
-50 -25
0255075 100
125
150
4
3
2
1
0
0
10
20
30 40
80
75
70
65
60
55
50
45
40
-50 -25 0
25 50 75 100
125
150
3.0
2.5
2.0
1.5
1.0
-50
-25
0255075 100
125 150
OM7603ST
LOAD REGULATION
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
, Output Voltage Change (%)
O
-1.4
VI= -15V
VO= -10V
-75-50 -25 0 25 50 75 100 125 150
IL= 1.5A
TJ, Junction Temperature (C°)
ADJUSTMENT PIN CURRENT
80
75
70
65
60
55
50
45
, Adjustment Pin Current (µA)
Adj
I
40
-75 -50 -25 0 25 50 75 100 125 150
TJ, Junction Temperature (C°)
IL= 0.5A
CURRENT LIMIT
4
3
2
1
, Output Current (A)
O
I
0
010203040
VI- VO, Input - Output Voltage Differential (Vdc)
TJ= -55°C
TJ= -25°C
TJ= -150°C
DROPOUT VOLTAGE
)I
dc
3.0
2.5
2.0
1.5
, Input - Output Voltage Differential (V
O
1.0
- V
I
V
VO= -5V ³VO= 100mV
IL= 500mA
IL= 1.5A
IL= 1.0A
IL= 200mA
IL= 20mA
-50 -25 0 25 50 75 100 125 150
TJ, Junction Temperature (C°)
TEMPERATURE STABILITY
1.270
1.260
MINIMUM OPERATING CURRENT
1.8
1.6
1.4
TJ= -55°C
TJ= 25°C
TJ= 150°C
3.3
1.2
1.250
1.0
0.8
1.240
, Reference Voltage (V) ³V
ref
V
1.230
-75-50 -25 0 25 50 75 100 125 150
TJ, Junction Temperature (C°)
3.3 - 139
0.6
0.4
, Quiescent Current (mA)
B
0.2
0
010203040
V
- VO, Input - Output Voltage Differential (Vdc)
I
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205 Crawford Street, Leominster, MA 01453 USA (508) 534-5776 FAX (508) 537-4246
OM7603ST
.430
.410
.200
.190
.038 MAX.
.005
.120 TYP.
.537
.527
.665
.645
.420
.410
.150
.140
.750
.500
.100 TYP.
.035
.025
.045
.035
TYPICAL APPLICATIONS
HIGH STABILITY REGULATOR
Out
)
R2*
R1
1k
1%
-3
7V
LM329B
+
1µF
Solid
Tantalum
Adj
V
-V
IN
IN
OM7603ST
V
OUT
*R2 = - 908
R3
1.5K
1%
(V
9.08 x 10
STANDARD APPLICATION
*CINis required if regulator is located more than 4 inches
from power supply filter. A 1µF solid tantalum or 10µF
aluminum electrolytic is recommended.
** COis necessary for stability. A 1µF solid tantalum or
10µF aluminum electrolytic is recommended.
R
V
V
OUT
OUT
= -1.25V (1 +
= -1.25V (1 +
R1
2
)
+
1µF
Solid
Tantalum
-V
OUT
DUAL TRACKING SUPPLY ±1.25V TO ±20V
I
1.0µF
V
I
I
PRO
I
Ad
OM7603ST
OM7602ST
VINV
+
1µF*
+
10µF
+
10µF
+
1µF*
VINV
OM7603ST
Adj
Adj
R2
OUT
R2
5K
1%
R4
5k
1%
OUT
R1
120
+
R1**
2.2*
100
µF
1%
R3
5K
+
R5**
2.2*
100
µF
1%
++
*
O
1.0µF
V
OU
+V
D1
IN4002
D2
IN4002
-V
OUT
-V
+V
-V
IN
* Solid Tantalum
** R1 or R5 may be trimmed slightly to improve tracking.
CIN*C
-V
IN
OU
OUT
3.3
MECHANICAL OUTLINE
NOTES
• Case is metal/hermetically sealed
• Isolated Tab
PIN CONNECTION
Tab
123
ISOLATED NON-ISOLATED
Front View Front View
Pin 1: Adjust Pin 1: Adjust
Pin 2: Input Pin 2: Input
Pin 3: Output Pin 3: Output
Tab: Isolated Tab: Input
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