3.3 - 137
3.3
Three Terminal, Adjustable Voltage, 1.5 Amp
Precision Negative Regulator In Hermetic
JEDEC TO-257AA Package
4 11 R4
Supersedes 1 07 R3
ISOLATED HERMETIC TO-257AA
ADJUSTABLE VOLTAGE REGULATOR
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
T
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.5W
T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3W
Thermal Resistance
q
JC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5C/W
q
JA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42C/W
Note: This device is also available in a non-isolated JEDEC TO-257AA package.
Use part number OM7603NT for non-isolated unit.
OM7603ST
3.3 - 138
3.3
OM7603ST
ELECTRICAL CHARACTERISTICS
-55C T
A
125C, I
L
= 8mA (unless otherwise specified)
Parameter
Symbol
Test Conditions
Min.
Max.
Unit
Reference Voltage
V
REF
V
DIFF
= 3.0V, T
A
= 25C
-1.262
-1.238
V
DIFF
= 3.0V
-1.280
-1.220
V
V
DIFF
= 40V
-1.280
-1.220
Line Regulation
R
LINE
3.0 V V
DIFF
40V, T
A
= 25C
-4.5
4.5
(Note 1)
3.0V V
DIFF
40V
-13.8
13.8
mV
Load Regulation
R
LOAD
V
DIFF
=
5V, 8mA I
L
1.5A
-25
25
(Note 1)
V
DIFF
=
12V, 8mA I
L
1.5A, T
A
= 25C
-25
25
mV
V
DIFF
40V, 8mA I
L
1.5A, T
A
= 25C
-25
25
V
DIFF
=
40V, 8mA I
L
1.5A
-50
50
Thermal Regulation
V
RTH
V
in
= -14.6V, I
L
= 1.5A
-5
5
mV
P
d
= 20 Watts, t = 10 ms, T
A
= 25C
Ripple Rejection
R
N
f = 120 Hz, V
out
= V
ref
66
dB
(Note 2)
C
Adj
= 10 F, I
out
= 100 mA
Adjustment Pin Current
I
Adj
V
DIFF
= 3.0V
100
V
DIFF
= 40V
100
A
Adjustment Pin
I
Adj
Current Change
(line)
3V V
DIFF
40V
-5
5
A
I
Adj
(load)
V
DIFF
= 5V, 8mA I
L
1.5A
-5
5
A
Miminum Load Current
I
Lmin
V
DIFF
= 3.0V, V
out
= -1.4V (forced)
3.0
V
DIFF
= 10V, V
out
= -1.4V (forced)
3.0
mA
V
DIFF
= 40V, V
out
= -1.4V (forced)
5.0
Current Limit
I
CL
V
DIFF
5V
1.5
3.5
(Note 2)
V
DIFF
= 40V, T
A
= 25C
0.24
1.2
A
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 - 139
3.3
OM7603ST
TYPICAL PERFORMANCE APPLICATIONS
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
-50
-25
0
25
50
75
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
0
25
50
75
100
125
150
LOAD REGULATION
T
J
, Junction Temperature (C)
IL = 0.5A
IL = 1.5A
VI = -15V
VO = -10V
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
-75
-50
-25
0
25
50
75
100 125
150
ADJUSTMENT PIN CURRENT
T
J
, Junction Temperature (C)
80
75
70
65
60
55
50
45
40
-75
-50
-25
0
25
50
75
100 125 150
TEMPERATURE STABILITY
T
J
, Junction Temperature (C)
1.270
1.260
1.250
1.240
1.230
-75
-50
-25
0
25
50
75
100 125 150
CURRENT LIMIT
V
I
- V
O
, Input - Output Voltage Differential (V
dc
)
TJ = -25C
TJ = -55C
TJ = -150C
4
3
2
1
0
0
10
20
30
40
DROPOUT VOLTAGE
T
J
, Junction Temperature (C)
IL = 1.5A
V
O
= -5V V
O
= 100mV
IL = 20mA
IL = 1.0A
IL = 500mA
IL = 200mA
3.0
2.5
2.0
1.5
1.0
-50
-25
0
25
50
75
100
125 150
MINIMUM OPERATING CURRENT
TJ = 25C
TJ = -55C
TJ = 150C
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
10
20
30
40
V
I
- V
O
, Input - Output Voltage Differential (V
dc
)
V
ref
, Reference Voltage (V)
V
O
, Output Voltage Change (%)
I
O
, Output Current (A)
I
Adj
, Adjustment Pin Current (A)
V
I
- V
O
, Input - Output Voltage Differential (V
dc
)
I
B
, Quiescent Current (mA)
3.3
205 Crawford Street, Leominster, MA 01453 USA (508) 534-5776 FAX (508) 537-4246
OM7603ST
TYPICAL APPLICATIONS
1
2
3
Tab
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
PIN CONNECTION
.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
MECHANICAL OUTLINE
NOTES
Case is metal/hermetically sealed
Isolated Tab
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.
** 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
HIGH STABILITY REGULATOR
Adj
VIN
VOUT
OM7603ST
+
1F
Solid
Tantalum
R3
1.5K
1%
+
1F
Solid
Tantalum
7V
LM329B
R2*
R1
1k
1%
-VOUT
-VIN
(VOut)
9.08 x 10
-3
*R2 =
- 908
DUAL TRACKING SUPPLY 1.25V TO 20V
D1
IN4002
OM7602ST
VIN VOUT
Adj
Adj
VIN VOUT
OM7603ST
+VI
+VOU
-VIN
-VOUT
R2
5K
1%
R4
5k
1%
R1**
100
1%
2.2*
F
1F*
D2
IN4002
1F*
10F
10F
*
Solid Tantalum
** R1 or R5 may be trimmed slightly to improve tracking.
R3
5K
R5**
100
1%
+
+
2.2*
F
OM7603ST
1.0F
1.0F
-VIN
-VOUT
VOU
VI
IAd
IPRO
CIN*
CO*
R2
R1
120
+
+
+
+
+
+
-
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