OM1840NKM OM1840SCM
OM1840NCM
5 AMP LOW DROPOUT POSITIVE ADJUSTABLE
REGULATOR APPROVED TO DESC DRAWING 5962-89521
Three Terminal, Positive Adjustable
Low Dropout Voltage Regulator In
Hermetic Packages
FEATURES
•
•
•
•
•
•
•
•
Similar To Industry Standard LT1084
Approved To DESC Standardized Military Drawing Number 5962-89521
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-258 Available in Isolated and Non-Isolated Packages
DESCRIPTION
This three terminal positive adjustable voltage regulator is designed to provide 5A
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-258 and
TO-3 packages, this device is ideally suited for Military applications where small size
and high reliability is required.
ABSOLUTE MAXIMUM RATINGS
@ 25°C
Power Dissipation (P
d
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited
Input - Output Voltage Differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 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:
θ
JC
(TO-258 Isolated) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.0°C/W
θ
JC
(TO-258 Non-Isolated) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.3°C/W
θ
JC
(TO-3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.0°C/W
Maximum Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0 A
Recommended Operating Conditions:
Output Voltage Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.3V to 15 V
Ambient Operating Temperature Range (T
A
) . . . . . . . . . . . . . . . . - 55°C to + 125°C
Input Voltage Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V to 25 V
3.3
1 08 R3
Supersedes 4 11 R2
3.3 - 75
OM1840SCM OM1840NCM OM1840NKM
ELECTRICAL CHARACTERISTICS
Parameter
Reference Voltage
Symbol
V
REF
-55°C
≤
T
A
≤
+125°C (unless otherwise specified)
Min.
1.238
Max.
1.262
Unit
V
Test Conditions
V
IN
- V
OUT
= 3.0 V,
I
OUT
= 10 mA, T
A
= 25° C
1.5 V
≤ V
IN
- V
OUT
≤
25 V,
I
OUT
= 10 mA, I
FL
= 3.0 A
•
1.225
1.270
V
Line Regulation
(Note 1)
∆V
OUT
∆V
IN
1.5 V
≤ V
IN
- V
OUT
≤
15 V,
I
OUT
= 10 mA, T
A
= 25° C
15 V
≤ V
IN
- V
OUT
≤
35 V,
I
OUT
= 10 mA
0.2
%
•
0.5
%
Load Regulation
(Note 1)
∆V
OUT
∆I
OUT
V
IN
- V
OUT
= 3.0 V, T
A
= 25° C
I
OUT
= 10 mA, I
FL
= 3.0 A
I
FL
= 3.0 A,
∆V
REF
= 1%
30 ms pulse, T
A
= +25° C
f = 120 Hz, C
Adj
= 25 µF,
C
OUT
= 25 µF (tantalum), I
FL
= 3.0 A,
V
IN
- V
OUT
= 3.0 V
1.5 V
≤ V
IN
- V
OUT
≤
25 V,
I
OUT
= 10 mA, I
FL
= 3.0 A
1.5 V
≤ V
IN
- V
OUT
≤
25 V,
10 mA
≤
I
OUT
≤
3.0 A
V
IN
- V
OUT
= 25 V
V
IN
- V
OUT
≤
5.0 V
V
IN
- V
OUT
= 25 V
-55° C
≤
T
J
≤
+125° C
0.3
%
Dropout Voltage
Thermal Regulation
Ripple Rejection
V
DO
-
∆V
IN
∆V
OUT
•
•
•
60
0.4
1.5
0.015
%
V
%/W
dB
Adjust Pin Current
I
Adj
∆I
Adj
•
•
•
•
•
•
120
µA
Adjust Pin Current Change
5.0
µA
Miminum Load Current
Current Limit
I
Min
I
Lim
∆V
OUT
∆T
∆V
OUT
∆T
10
5.5
0.3
1.5
mA
A
A
%
Temperature Stability
(Note 2)
Long Term Stability
(Note 2)
T
A
= +125° C, t = 1000 hrs
1.0
%
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 45 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.
Guaranteed by design, characterization or correlation to other tested parameters.
The • denotes the specifications which apply over the full operating temperature range.
2.
3.
PART NUMBER DESIGNATOR
3.3
Standard Military Drawing Number
8952101Y
8952101Z
8952101X
“Y” = Isolated
“Z” = Non-Isolated
Omnirel Part Number
OM1840SCM
OM1840NCM
OM1840NKM
Part Numbering System
Voltage Regulators
isola
OM-1840-S-C-M
Company
Identification
Part
Number
Screening
M= MIL-M
38535
* Package Codes:
K= TO-204AA (TO-3)
Z= TO-259AA (Z-Tab)
C = TO-258AA
Package
(see Package codes*)
S= Isolated
N= Non
isolated
3.3 - 76
OM1840NKM OM1840SCM OM1840NCM
TYPICAL PERFORMANCE CHARACTERISTICS
LOAD REGULATION
0.10
10
∆
I= 5A
9
SHORT CIRCUIT CURRENT
8
7
6
5
4
3
2
1
I
FULL LOAD
150°C
25°C
-55°C
OUTPUT VOLTAGE DEVIATION (%)
0
-0.05
-0.10
-0.15
-0.20
-50
-25
0
25
50
75
100 125
150
SHORT CIRCUIT CURRENT (A)
0.05
0
0
5
10
15
20
25
30
35
TEMPERATURE (°C)
INPUT/OUTPUT DIFFERENTIAL (V)
100
90
ADJUSTMENT PIN CURRENT
MINIMUM INPUT/OUTPUT DIFFERENTIAL (V)
2
DROPOUT VOLTAGE
• INDICATES GUARANTEED TEST POINT
-55°C T
150°C
-55°C
≤
T
j
j
≤
150°C
0°C
≤
T
j
≤
j
125°C
0°C T 125°C
ADJUSTMENT PIN CURRENT (µA)
80
70
60
50
40
30
20
10
0
-50
-25
0
25
50
75
100
125
150
TEMERATURE (°C)
1
T
j
= 25°C
T
j
= 150°C
T
j
= -55°C
0
0
1
2
3
4
5
6
OUTPUT CURRENT (A)
TEMPERATURE STABILITY
1.270
MINIMUM OPERATING CURRENT
10
MINIMUM OPERATING CURRENT (mA)
9
8
7
6
5
4
3
2
1
0
0
5
10
15
20
25
30
INPUT/OUTPUT DIFFERENTIAL (V)
35
T
j
= -55°C
T
j
= 25°C
T
j
= 150°C
3.3
REFERENCE VOLTAGE (V)
1.260
1.250
1.240
1.230
-50
-25
0
25
50
75
100 125 150
TEMPERATURE (°C)
3.3 - 77
OM1840SCM OM1840NCM OM1840NKM
TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
Parelleling Regulators
V
IN
IN
OM1840
OUT
ADJ
V
OUT
=1.25
IN
OM1840
OUT
ADJ
R1
120
R2
0.015Ω
0.015
Improving Ripple Rejection
V
IN
10µF
+
2 FEET #18 WIRE*
R2
__
(
1+ R1
)
V
IN
OM1840
V
OUT
R1
1211%
Ω
R2
365
1%
Ω
+
C1
V
IN
≥
16.5V
150µF
ADJ
I
OUT
= OA TO 15A
*C1 IMPROVES RIPPLE
REJECTION. X
C
SHOULD BE
~ R1 AT RIPPLE FREQUENCY.
10µF*
* THE #18 WIRE ACTS
AS BALLAST RESISTENCE
INSURING CURRENT SHARING
BETWEEN BOTH DEVICES.
1.2V - 15V Adjustable Regulator
V
IN
OM1840
V
OUT
ADJ
+
5V Regulator with Shutdown
V
IN
V
IN
OM1840
V
OUT
ADJ
121
Ω
1%
+
R1
121
Ω
V
OUT
†
5V
+
C1
10µF
R2
5k
C2
100µF
TTL
+
10µF
2N3904
1k
1k
100µF
365
Ω
1%
*NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS
†
R2
__
V
OUT
=1.25V
1+ R1
(
)
MECHANICAL OUTLINE
.165
.155
.695
.685
.270
.240
.045
.035
0.135
MAX.
MECHANICAL OUTLINE TO-3
1.53
REF.
0.875
MAX.
0.450
0.250
1.197
1.177
0.675
0.655
0.440
0.420
0.188 R.
MAX.
.835
.815
.707
.697
.550
.530
0.312
MIN.
SEATING
PLANE
0.043
0.038
2 PLCS.
0.225
0.205
0.161
0.151
0.525 R.
MAX.
.092 MAX.
3.3
.750
.500
.065
.055
1
2
3
.005
PIN OUT
1
2
Case
Adjust
V
IN
V
OUT
.200 TYP.
.140 TYP.
PIN OUT
1
2
3
Adjust
V
OUT
V
IN
NOTES
• Case is metal/hermetically sealed
• Isolated Tab
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