0.5 VOLT LOW DROPOUT POSITIVE FIXED VOLTAGE
REGULATOR APPROVED TO DESC DRAWING
Three T erminal, Fixed V oltage, 1 Amp
Low Dropout Voltage Regulator In
Hermetic JEDEC TO-257AA Package
FEATURES
• Similar To Industry Standard LM2940
• Approved To DESC Standardized Military Drawing
• Dropout Voltage Typically 0.5 V @ IO= 1 A
• Output Current in Excess of 1 A
• Reverse Battery Protection
• Internal Short Circuit Protection
• Isolated Hermetic Package
OM2940STM
DESCRIPTION
These three terminal fixed voltage regulators are designed to provide 1.0A with high
efficiency. It has the ability to source 1A of output current with a typical dropout
voltage of .5V and a maximum of 1V over the entire temperature range. It is supplied
in the hermetic TO-257 package and is ideally suited for Military applications where
small size and high reliability is required.
ABSOLUTE MAXIMUM RATINGS
Input Voltage..........................................................26Vdc
Output Voltage.............................................+5V, +12V, +15Vdc
Operating Junction Temperature Range ........................- 55°C to + 125°C
Storage Temperature Range ..................................- 65°C to + 150°C
Lead Temperature (Soldering 10 seconds) ................................300°C
Thermal Resistance:
qJC(Isolated)......................................................4.2°C/W
qJA...............................................................42°C/W
Maximum Output Current ................................................1.3 A
PART NUMBER DESIGNATOR
Standard Military Drawing Number Omnirel Part Number
5962-8958710MUX OM2940-5STM
5962-9088401MUX OM2940-12STM
5962-9088501MUX OM2940-15STM
3.3
4 11 R1
Supersedes 3 02 R0
3.3 - 97
3.3
OM2940STM
3.3 - 98
ELECTRICAL CHARACTERISTICS, P/N OM2940-5 (5 Volt)
Test Conditions are -55°C TA 125°C, VIN= 10 V, IO= 1 A, C
= 22 µF (unless otherwise specified).
OUT
Parameter Symbol Test Conditions Notes Min. Max. Unit
Output Voltage V
Maximum Line Transient V
Reverse Polarity
Input Voltage DC
Reverse Polarity
Input Voltage Transient
Quiescent Current I
Line Regulation V
Load Regulation V
Dropout Voltage V
Output Noise Voltage V
Output Impedance R
Short Circuit Current I
Ripple Rejection R
Notes: 1. T
= 25°C.
A
2. Over full operating temperature range.
OUT
LTVO
V
RIN
V
RIT
Q
RLN
RLD
DO
ON
O
OS
R
VIN= 10 V, 50 mA I
VIN= 10 V, I
V
IN
VIN= 7 V, I
VIN= 26 V, I
VIN= 10 V, I
VIN= 6 V, I
VIN= 6 V, I
VIN= 10 V, I
= 6 V, I
OUT
OUT
OUT
OUT
OUT
OUT
= 5 mA
= 5 mA
OUT
OUT
= 50 mA
= 50 mA
= 5 mA
= 5 mA
= 1 A
= 1 A
6 V, RO= 100 , t = 20 ms 1, 2 40 V
RO= 100 1, 2 -15
RO= 100 , t =20 ms 1, 2 -45
VIN= 10 V, I
V
IN
V
IN
V
IN
= 7 V, I
= 26 V, I
= 10 V, I
OUT
OUT
OUT
OUT
= 5 mA
= 5 mA
= 5 mA
= 1 A
7 V VIN 26 V, 1 ±40
I
= 5 mA 2 ±50
OUT
OUT
I
= 1 A
OUT
I
= 100 mA
OUT
VIN= 10 V, IO= 5 mA, 1, 2 700 µV rms
10 Hz - 100 Hz
VIN= 10 V, I
and 20 mA ac, fO= 120 Hz
= 100 mA dc
OUT
VIN= 10 V
VIN= 10 V + 1 V rms, 1 60
I
= 5 mA, f = 1 kHz 2 50
OUT
1 4.85 5.15
2 4.75 5.25
1 4.85 5.15
2 4.75 5.25
1 4.85 5.15
2 4.75 5.25
1 4.85 5.15
2 4.75 5.25
1 4.85 5.15
2 4.75 5.25
1 4.85 5.15
2 4.75 5.25
1 4.85 5.15
2 4.75 5.25
1 4.85 5.15
2 4.75 5.25
115
220
115
220
115
220
150
2 100
1 ±50
1 A
2 ±100
1.7
21
1 150
2 200
1, 2 1
1 1.5
2 1.3
ELECTRICAL CHARACTERISTICS, P/N OM2940-12 (12 Volt)
Test Conditions are -55°C TA 125°C, VIN= 17 V, IO= 1 A, C
Parameter Symbol Test Conditions Notes Min. Max. Unit
Output Voltage V
V
Maximum Line Transient V
Reverse Polarity
V
Input Voltage DC
Reverse Polarity
V
Input Voltage Transient
Quiescent Current I
mA
Line Regulation V
mV
Load Regulation V
mV
Dropout Voltage V
V
mV
Output Noise Voltage V
Output Impedance ROVIN= 17 V, I
Short Circuit Current I
A
Ripple Rejection R
dB
Notes: 1. T
= 25°C.
A
2. Over full operating temperature range.
OUT
LTVO
V
RIN
V
RIT
Q
RLN
RLD
DO
ON
OS
R
VIN= 17 V, I
V
IN
VIN= 14 V, I
VIN= 26 V, I
VIN= 17 V, I
VIN= 13.6 V, I
VIN= 13.6 V, I
VIN= 17 V, I
= 13.6 V, I
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
= 50 mA
= 5 mA
= 5 mA
= 5 mA
= 5 mA
= 1 A
= 1 A
= 50 mA
13 V, RO= 100 , t = 20 ms 1, 2 40 V
RO= 100 1, 2 -15
RO= 100 , t =20 ms 1, 2 -45
VIN= 17 V, I
V
IN
V
IN
V
IN
= 14 V, I
= 26 V, I
= 17 V, I
= 5 mA
OUT
= 5 mA
OUT
= 5 mA
OUT
= 1 A
OUT
14 V VIN 26 V, 1 ±75
I
= 5 mA 2 ±120
OUT
VIN= 17 V, 50 mA I
I
I
OUT
OUT
OUT
= 1 A
= 100 mA
VIN= 17 V, IO= 5 mA, 1 1000 µV rms
10 Hz - 100 Hz
= 100 mA dc
OUT
and 20 mA ac, fO= 120 Hz
VIN= 17 V
VIN= 17 V + 1 V rms, 1 52
I
= 5 mA, f = 1 kHz 2 46
OUT
= 22 µF (unless otherwise specified).
OUT
1 11.64 12.36
2 11.40 12.60
1 11.64 12.36
2 11.40 12.60
1 11.64 12.36
2 11.40 12.60
1 11.64 12.36
2 11.40 12.60
1 11.64 12.36
2 11.40 12.60
1 11.64 12.36
2 11.40 12.60
1 11.64 12.36
2 11.40 12.60
1 11.64 12.36
2 11.40 12.60
115
220
115
220
115
150
1 ±120
1 A
2 ±190
1.7
21
1 150
2 200
1, 2 1
1 1.6
2 1.3
V
V
V
mA
220
260
mV
mV
V
mV
A
dB
.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
3.3 - 99
ELECTRICAL CHARACTERISTICS, P/N OM2940-15 (15Volt)
Test Conditions are -55°C TA 125°C, VIN= 20 V, IO= 1 A, C
Parameter Symbol Test Conditions Notes Min. Max. Unit
Output Voltage V
Maximum Line Transient V
Reverse Polarity
Input Voltage DC
Reverse Polarity
Input Voltage Transient
Quiescent Current I
Line Regulation V
Load Regulation V
Dropout Voltage V
Output Noise Voltage V
Output Impedance R
Short Circuit Current I
Ripple Rejection R
Notes: 1. T
= 25°C.
A
2. Over full operating temperature range.
OUT
LTVO
V
RIN
V
RIT
Q
RLN
RLD
DO
ON
O
OS
R
VIN= 20 V, I
VIN= 16.75 V, I
VIN= 17 V, I
VIN= 26 V, I
VIN= 20 V, I
VIN= 16.75 V, I
VIN= 16.75 V, I
VIN= 20 V, I
OUT
OUT
OUT
OUT
OUT
OUT
OUT
= 5 mA
= 5 mA
= 5 mA
= 5 mA
= 1 A
= 1 A
OUT
= 50 mA
= 50 mA
16 V, RO= 100 , t = 20 ms 1, 2 40 V
RO= 100 1, 2 -15
RO= 100 , t =20 ms 1, 2 -45
VIN= 20 V, I
V
IN
V
IN
V
IN
= 17 V, I
= 26 V, I
= 20 V, I
OUT
OUT
OUT
OUT
= 5 mA
= 5 mA
= 5 mA
= 1 A
17 V VIN 26 V, 1 ±95
I
= 5 mA 2 ±150
OUT
VIN= 20 V, 50 mA I
I
OUT
I
OUT
= 100 mA
OUT
= 1 A
VIN= 20 V, IO= 5 mA, 1 1000 µV rms
10 Hz - 100 Hz
VIN= 20 V, I
and 20 mA dc, fO= 120 Hz
= 100 mA ac
OUT
VIN= 20 V
VIN= 20 V + 1 V rms, 1 48
I
= 5 mA, f = 1 kHz 2 42
OUT
3.3
= 22 µF (unless otherwise specified).
OUT
1 14.55 15.45
2 14.25 15.75
1 14.55 15.45
2 14.25 15.75
1 14.55 15.45
2 14.25 15.75
1 14.55 15.45
2 14.25 15.75
1 14.55 15.45
2 14.25 15.75
1 14.55 15.45
2 14.25 15.75
1 14.55 15.45
2 14.25 15.75
1 14.55 15.45
2 14.25 15.75
115
220
115
220
115
220
150
260
1 A
1 ±150
2 ±240
1.7
21
1 150
2 200
1, 2 1
1 1.6
2 1.3
V
V
V
mA
mV
mV
V
mV
A
dB
PIN CONNECTION
Tab
123
Front View
Pin 1: V
IN
Pin 2: Gnd
Pin 3: V
OUT
Tab: Isolated
MECHANICAL OUTLINE
NOTES
• Case is metal/hermetically sealed
• Isolated Tab
OM2940STM
205 Crawford Street, Leominster, MA 01453 USA (508) 534-5776 FAX (508) 537-4246
OM2940STM
0.9
Inout - Output Differential (V)
0
Output Current (mA)
Dropout Voltage
TJ = 25°C
200 1000800600400
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0
0.1
1.0
Dropout Voltage (V)
-40
Temperature (°C)
Dropout Voltage
vs Temperature
1 A
0 16012040
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
80
500 mA
100 mA
5.10
Output Voltage (5V)
-40
Temperature (°C)
Output Voltage
vs Temperature
0 16012040
5.08
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
4.90
80
30
-10
Time (µs)
Line Transient Response
0
0V
20
10
0
-10
-20
-30
3V
Output Voltage
Deviation (mV)
Input Voltage
Change (V)
10 20 30 40 50 60
200
Quiescent Current (mA)
0
Input Voltage (V)
Quiescent Current
1 A
180
160
140
120
100
80
60
40
20
0
500 mA
100 mA
5101520253035
50
Quiescent Current (mA)
Temperature (°C)
Quiescent Current
vs Temperature
VIN = V
OUT
+5V
0
40
30
20
10
-40 0 16012040 80
1 A
500 mA
10 mA
50
Quiescent Current (mA)
0
Load Current (A)
Quiescent Current
0.2 1.00.80.4
40
30
20
10
0
0.6
VIN = 14V
V
OUT
= 5V
T
J
= 25°C
95
Ripple Rejection (dB)
1
Frequency (Hz)
Ripple Rejection
10
100k10k
100351k
1M
45
55
65
75
85
VIN = 10V
C
OUT
= 22µF
I
OUT
= 10mA
V
OUT
=5V
0.5
-10
Time (µs)
Load Transient Response
0403010020
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
1.0
0.5
Output Voltage
Deviation (V)
Load Current
Change (A)
VIN = 10V, C
OUT
= 22µF
T
J
= 25°C, V
OUT
=5V
TYPICAL APPLICATIONS
3.3
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