OM1325SMM OM1325NMM
OM1325NKM OM1325NTM
OM1325STM
OM1325N2M
1.5 AMP NEGATIVE ADJUSTABLE VOLTAGE
REGULATOR APPROVED TO DESC DRAWING 7703406
Three Terminal, Precision Adjustable
Negative Voltage Regulator In Hermetic
Style Packages (LM137A)
Please see mechanical
outlines herein
FEATURES
•
•
•
•
•
•
Similar To Industry Standard LM137A
Approved To DESC Standardized Military Drawing Number 7703406
Built In Thermal Overload Protection
Short Circuit Current Limiting
Available In Six Package Styles
Maximum Output Voltage Tolerance Is Guaranteed to + 1%
DESCRIPTION
These three terminal negative regulators are supplied in hermetically sealed
packages. All protective features are designed into the circuit, including thermal
shutdown, current-limiting, and safe-area control. With heat sinking, these devices
can deliver up to 1.5 amps of output current. The LCC-20 device is limited to .5
amps. The unit also features output voltages that can be fixed from -1.2 volts to -37
volts using external resistors.
ABSOLUTE MAXIMUM RATINGS
T
c
@ 25°C
Power Dissipation
Case 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 W
Case-All Others. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 W
Input - Output Voltage Differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V
Operating Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . - 55°C to + 150°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 65°C to + 150°C
Lead Temperature (Soldering 10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . 300°C
Thermal Resistance, Junction to Case:
Case 2, LCC-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17°C/W
Case U & M, TO-257 (Isol) and SMD-3 . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2°C/W
Case T&N, TO-257 (Non-Isol) and SMD-1 . . . . . . . . . . . . . . . . . . . . . . . 3.5°C/W
Case Y, TO-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0°C/W
Maximum Output Current:
Case 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 A
Case-All Others. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A
Recommended Operating Conditions:
Output Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-1.2 to -37 VDC
Ambient Operating Temperature Range (T
A
). . . . . . . . . . . . . . . . - 55°C to + 125°C
Input Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -4.25 to -41.25 VDC
4 11 R2
Supersedes 1 07 R1
3.5
3.5 - 21
OM1325NTM, OM1325STM, OM1325NKM, OM1325SMM, OM1325NMM, OM1325N2M
ELECTRICAL CHARACTERISTICS
Parameter
Reference Voltage
Symbol
V
REF
-55°C ≤ T
A
≤ 125°C, I
L
= 8mA (unless otherwise specified)
OM1325NTM, OM1325STM, OM1325NKM, OM1325SMM, OM1325NMM
Test Conditions
V
DIFF
= 3.0V, T
A
= 25°C
V
DIFF
= 3.0V
V
DIFF
= 40V
Line Regulation
(Note 1)
Load Regulation
(Note 1)
R
LOAD
R
LINE
3.0 V ≤
V
DIFF
≤ 40V, T
A
= 25°C
3.0V ≤
V
DIFF
≤ 40V
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
V
DIFF
= 3.0V
V
DIFF
= 40V
Adjustment Pin
Current Change
∆I
Adj
(line)
∆I
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
V
DIFF
= 40V, T
A
= 25°C
3V ≤
V
DIFF
≤ 40V
Min.
-1.262
Max.
-1.238
-1.220
-1.220
4.5
13.8
25
25
25
50
5
mV
mV
mV
V
Unit
•
•
•
•
-1.280
-1.280
-4.5
-13.8
-25
-25
-25
•
-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
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.
PART NUMBER DESIGNATOR
Standard Military Drawing Number
7703406M
7703406U
7703406T
7703406Y
7703406N
77034062
Omnirel Part Number
OM1325SMM
OM1325STM
OM1325NTM
OM1325NKM
OM1325NMM
OM1325N2M
Omnirel Package Designation
SMD-3
TO-257 (Isolated)
TO-257 (non-Isolated)
TO-3
SMD-1
LCC-20
3.5
3.5 - 22
OM1325NTM, OM1325STM, OM1325NKM, OM1325SMM, OM1325NMM, OM1325N2M
ELECTRICAL CHARACTERISTICS
OM1325N2M
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
3.0 V ≤
V
DIFF
≤ 40V, T
A
= 25°C
3.0V ≤
V
DIFF
≤ 40V
V
DIFF
=
5V, 8mA ≤ I
L
≤ 200 mA
V
DIFF
=
15V, 8mA ≤ I
L
≤ 200m, AT
A
= 25°C
V
DIFF
40V, 8mA ≤ I
L
≤150 mA, AT
A
= 25°C
V
DIFF
=
40V, 8mA ≤ I
L
≤ 50 mA
•
•
•
•
-1.280
-1.280
-4.5
-13.8
-25
-25
-25
Line Regulation
(Note 1)
Load Regulation
(Note 1)
R
LINE
R
LOAD
•
-50
-5
Thermal Regulation
V
RTH
V
in
= -16.25V, I
L
=330 mA
P
d
=5 Watts, t = 10 ms, T
A
= 25°C
Ripple Rejection
(Note 2)
Adjustment Pin Current
R
N
f = 120 Hz, V
out
= V
ref
C
Adj
= 10 µF
V
DIFF
= 3.0V
V
DIFF
= 40V
•
•
•
•
•
•
•
•
•
66
dB
I
Adj
100
100
µA
Adjustment Pin
Current Change
∆I
Adj
(line)
∆I
Adj
(load)
V
DIFF
= 5V, 8mA ≤ I
L
≤ 500 mA
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)
V
DIFF
≤ 5V
V
DIFF
= 40V, T
A
= 25°C
-5
5
3.0
3.0
5.0
0.5
0.15
1.8
0.65
A
mA
µA
3V ≤
V
DIFF
≤ 40V
-5
5
µA
Miminum Load Current
I
Lmin
Current Limit
(Note 2)
I
CL
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.
TYPICAL APPLICATION
I
PROG
+
C
IN
*
1.0µF
R
2
R
1
120Ω
C
O
**
+
1.0µF
* C
in
is required if regulator is located more
than 4 inches from power supply filter. A 1 µF
solid tantalum or 10 µF aluminum electrolytic is
recommended.
** C
o
is necessary for stability. A 1 µF solid
tantalum or 10 µF aluminum electrolytic is
recommended.
3.5
I
Adj
V
IN
-V
IN
OM1325STM
V
OUT
-V
OUT
V
out
= -1.25 V (1 +R
2
)
R
1
3.5 - 23
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