3.3 - 119
3.3
OM3914NKM
1 08 R2
Supersedes 4 11 R1
OM3914STM
OM3914NTM
Three Terminal, Negative Adjustable
Voltage Regulator In Hermetic
Packages
3 AMP NEGATIVE ADJUSTABLE REGULATOR APPROVED
TO DESC DRAWING 5962-87741
FEATURES
Similar To Industry Standard LT1033
Approved To DESC Standardized Military Drawing Number 5962-8774101
Adjustable Output Voltage
Built In Thermal Overload Protection
Short Circuit Current Limiting
Maximum Output Voltage Tolerance is Guaranteed To 1%
Guaranteed Dropout Voltage At Multiple Current Levels
TO-257 Available in Isolated and Non-Isolated Packages
DESCRIPTION
This three terminal negative adjustable voltage regulator is designed to provide 3A
with higher efficiency than conventional voltage regulators. This device is designed
to operate down to 1 Volt input to output differential and the dropout voltage is fully
specified as a function of load current. Supplied in easy-to-use hermetic TO-257 and
TO-3, this device is ideally suited for Military applications where small size and high
reliability is required.
ABSOLUTE MAXIMUM RATINGS @ 25C
Power Dissipation (P
d
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited
Input - Output Voltage Differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 V
Operating Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . - 55C to + 150C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 65C to + 150C
Lead Temperature (Soldering 10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300C
Thermal Resistance Junction to Case:
(TO-257, Isolated) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5C/W
(TO-257, Non-Isolated) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3C/W
(TO-3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0C/W
Recommended Operating Conditions:
Output Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -3V to -15 V
Ambient Operating Temperature Range (T
A
) . . . . . . . . . . . . . . . . - 55C to + 125C
Input Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 5V to -35 V
3.3 - 120
3.3
OM3914STM OM3914NTM OM3914NKM
ELECTRICAL CHARACTERISTICS
-55C
T
A
+125C (unless otherwise specified)
Parameter
Symbol
Test Conditions
Min.
Max.
Unit
Reference Voltage
V
REF
V
IN
- V
OUT
= 5 V, I
OUT
= 5 mA, T
A
= 25 C
-1.238
-1.262
V
3 V
V
IN
- V
OUT
35 V
-1.215
-1.285
Line Regulation
V
OUT
3 V
V
IN
- V
OUT
35 V
0.015
%/V
(Note 1)
V
IN
0.04
Load Regulation
V
OUT
V
OUT
5 V, T
A
= 25 C
50
mV
(Note 1)
I
OUT
10 mA
I
OUT
I
MAX.
75
V
OUT
5.0 V
1.0
%
10 mA
I
OUT
I
MAX.
1.5
Thermal Regulation
-
30 ms pulse, T
A
= 25 C
0.02
%/W
Ripple Rejection
V
IN
V
OUT
= -10 V, f = 120 Hz, C
Adj
= 0
56
dB
(Note 2)
V
REF
53
V
OUT
= -10 V, f = 120 Hz, C
Adj
= 10 F
70
dB
60
Adjust Pin Current
I
Adj
V
DIFF
= 35 V, I
L
= 10 mA
100
A
Adjust Pin Current Change
I
Adj
10 mA
I
OUT
I
MAX.
2.0
A
3 V
V
IN
- V
OUT
35 V
5.0
Minimum Load Current
I
Min
V
IN
- V
OUT
35 V
5.0
mA
V
IN
- V
OUT
10 V
3.0
Current Limit
I
Lim
V
IN
- V
OUT
10 V
3.0
6.0
A
3.0
V
IN
- V
OUT
= 35 V
0.5
2.5
A
0.5
Temperature Stability
V
OUT
-55 C
T
J
+125 C
1.5
%
(Note 2)
T
Long Term Stability
V
OUT
T
A
= +125 C, t = 1000 hrs
1.0
%
(Note 2)
T
Notes:
1. Line and Load Regulation are measured at a constant junction temperature using a low duty cycle pulse technique.
Although power dissipation is internally limited, regulation is guaranteed up to the maximum power dissipation of 30 W.
Power dissipation is determined by the input/output differential voltage and the output current. Guaranteed maximum
power dissipation will not be available over the full input/output voltage range.
2. Guaranteed by design, characterization or correlation to other tested parameters.
3. The denotes the specifications which apply over the full operating temperature range.
Part Numbering System
Voltage Regulators
OM-3914-S-T-M
Company
Identification
Part
Number
S= Isolated
N= Non isolated
Package
(see Package codes*)
Screening
M= MIL-M 38535
PART NUMBER DESIGNATOR
Standard Military Drawing Number
Omnirel Part Number
5962-8774101U
OM3914STM
5962-8774101T
OM3914NTM
5962-8774101X
OM3914NKM
"U" = Isolated
"T" = Non-Isolated
3.3 - 121
3.3
OM3914STM OM3914NTM OM3914NKM
TYPICAL PERFORMANCE CHARACTERISTICS
Reference Voltage (V)
1.270
1.260
1.250
1.240
1.230
-75 -50 -25 0 25 50 75 100125150
Temperature (C)
Output Current (A)
5
4
3
2
1
0
0
5
10 15 20 25 30 35
Input-Output Differential (V)
Output Voltage
Deviation (%)
0.8
0.4
0
-0.4
-0.8
0
0.8
1.6
2.4
3.2
4.0
Output Current (A)
Ripple Rejection (dB)
100
80
60
40
20
0
0.01
0.1
1
10
C
ADJ
= 0
V
IN
= -15 V
V
OUT
= -10 V
C
ADJ
= 10F
f = 120Hz, T
J
= 25C
Current (mA)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
10
20
30
40
Input-Output Differential (V)
Output Current (A)
T
J
= -55C
T
J
= 25C
T
J
= 150C
Input-Output Differential (V)
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
0.5 1.0 1.5 2.0 2.5 3.0
Output Current (A)
T
J
= -55C
T
J
= -25C
T
J
= -150C
DROPOUT VOLTAGE
TEMPERATURE STABILITY
MINIMUM LOAD CURRENT
RIPPLE REJECTION
LOAD REGULATION
GUARANTEED MINIMUM
OUTPUT CURRENT
3.3
OM3914STM OM3914NTM OM3914NKM
TYPICAL APPLICATIONS
Front View
1
2 3
MECHANICAL OUTLINES
.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
MULTIPLE TRACKING REGULATORS
HIGH STABILITY REGULATOR
-V
OUT
-V
IN
V
IN
V
OUT
C2
+
5F
C1
C3
+
10F
2F
ADJ.
OM3914
R2
R1
+
V
REF
I
ADJ
V
OUT
= V
REF
(
1+ R2
)
+ I
ADJ
(R2)
R1
R2
-V
OUT
3
-V
IN
+
2F
+ 2F
+
2F
2F
IN4002
IN4002
+
Solid
Tantalum
-V
OUT
2
2F
+
Solid
Tantalum
-V
OUT
1
2F
+
Solid
Tantalum
V
IN
V
OUT
ADJ.
OM3914
V
IN
V
OUT
ADJ.
OM3914
V
IN
V
OUT
ADJ.
OM3914
C1
R1
R2
R#N
+
C3
10F
R3
1.5k
1%
-V
OUT
-V
IN
V
IN
V
OUT
+
5F
2F
ADJ.
7V
LM329B
OM3914
R2*
R1
1k
1%
+
Solid
Tantalum
V
OUT
9.08 X 10
-3
*R2 =
NOTES:
Case is metal/hermetically sealed
Isolated Tab
Tab
4
CASE T
Pin 1 - Adjust
Pin 2 - VIN
Pin 3 - VOUT
Tab - VIN
CASE U
Pin 1 - Adjust
Pin 2 - VIN
Pin 3 - VOUT
Tab - No Connection
1.197
1.177
0.675
0.655
0.188 R.
MAX.
0.440
0.420
0.161
0.151
0.525 R.
MAX.
0.225
0.205
SEATING
PLANE
0.312
MIN.
0.450
0.250
0.043
0.038
2 PLCS.
0.135
MAX.
0.875
MAX.
1.53
REF.
OM3914NKM
Pin 1 Adjust
Pin 2 Vout
Case Vin
TO-3
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