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
@ 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
T
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.5W
T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3W
Thermal Resistance
q
JC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5°C/W
q
JA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42°C/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
V
REF
-55°C T
A
125°C, I
L
= 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
V
DIFF
= 3.0V, T
A
= 25°C
V
DIFF
= 3.0V
V
DIFF
= 40V
•
•
•
•
-1.280
-1.280
-4.5
-13.8
-25
-25
-25
Line Regulation
(Note 1)
Load Regulation
(Note 1)
R
LINE
3.0 V
V
DIFF
3.0V
40V, T
A
= 25°C
V
DIFF
40V
R
LOAD
V
DIFF
=
5V, 8mA I
L
1.5A
V
DIFF
=
12V, 8mA I
L
1.5A, T
A
= 25°C
V
DIFF
40V, 8mA I
L
1.5A, T
A
= 25°C
V
DIFF
=
40V, 8mA I
L
1.5A
Thermal Regulation
V
RTH
V
in
= -14.6V, I
L
= 1.5A
P
d
= 20 Watts, t = 10 ms, T
A
= 25°C
Ripple Rejection
(Note 2)
Adjustment Pin Current
I
Adj
R
N
f = 120 Hz, V
out
= V
ref
C
Adj
= 10 µF, I
out
= 100 mA
V
DIFF
= 3.0V
V
DIFF
= 40V
Adjustment Pin
Current Change
³I
Adj
(line)
³I
Adj
(load)
Miminum Load Current
I
Lmin
V
DIFF
= 5V, 8mA I
L
1.5A
V
DIFF
= 3.0V, V
out
= -1.4V (forced)
V
DIFF
= 10V, V
out
= -1.4V (forced)
V
DIFF
= 40V, V
out
= -1.4V (forced)
Current Limit
(Note 2)
I
CL
V
DIFF
5V
3V
V
DIFF
40V
•
-50
-5
•
•
•
•
•
•
•
•
•
66
dB
100
100
µA
-5
5
µA
-5
5
3.0
3.0
5.0
µA
mA
1.5
0.24
3.5
1.2
A
V
DIFF
= 40V, T
A
= 25°C
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 = -55°C
TJ = -25°C
TJ = -150°C
2
³V
O
, Output Voltage Change (%)
IL = 0.5A
I
O
, 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
T
J
, Junction Temperature (C°)
V
I
- V
O
, Input - Output Voltage Differential (V
dc
)
ADJUSTMENT PIN CURRENT
80
80
I
Adj
, Adjustment Pin Current (µA)
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
V
I
- V
O
, Input - Output Voltage Differential (V
dc
)
3.0
3.0
V
O
= -5V ³V
O
= 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
T
J
, Junction Temperature (C°)
T
J
, Junction Temperature (C°)
TEMPERATURE STABILITY
1.270
I
B
, 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 = -55°C
TJ = 25°C
TJ = 150°C
3.3
V
ref
, 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
V
I
- V
O
, Input - Output Voltage Differential (V
dc
)
T
J
, Junction Temperature (C°)
3.3 - 139
OM7603ST
TYPICAL APPLICATIONS
HIGH STABILITY REGULATOR
7V
LM329B
+
DUAL TRACKING SUPPLY ±1.25V TO ±20V
+VI
+
+
R2*
1µF
Solid
Tantalum
OM7602ST
VIN VOUT
Adj
1µF*
R2
5K
1%
R4
5k
1%
R1**
100
1%
R3
5K
+
2.2*
µF
+VOU
1µF
Solid
Tantalum
Adj
R3
1.5K
1%
R1
1k
1%
D1
IN4002
+
10µF
+
-VIN
VIN
VOUT
(VOut)
*R2 =
9.08 x 10
-3
-VOUT
10µF
OM7603ST
- 908
-VIN
+
-
1µF*
Adj
VIN VOUT
OM7603ST
R5**
100
1%
+
2.2*
µF
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 1µF solid tantalum or 10µF
aluminum electrolytic is recommended.
+
IPRO
R2
1.0µF
R1
120
CO*
+
1.0µF
** CO is necessary for stability. A 1µF solid tantalum or
10µF 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
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