3.3 - 141
3.3
Three Terminal, Adjustable Voltage, 3.0 Amp
Precision Positive Regulator In A 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
Reference Voltages Set To 2% (1% Available)
Built-In Thermal Overload Protection
Short Circuit Current Limiting
Product Is Available Screened To MIL-STD-883
Similar To Industry Standard P/N LM150A
DESCRIPTION
These three terminal positive regulators are 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 3.0 amps of
output current. These units feature 2% initial voltage tolerance, 0.3% load regulation
and 0.01% line regulation.
ABSOLUTE MAXIMUM RATINGS @ 25C
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +35V
Operating Junction Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55C to +150C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C
Typical Power/Thermal Characteristics:
Rated Power @ 25C
T
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25W
T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3W
Thermal Resistance
q
JC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2C/W
q
JA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42C/W
Note: For 1% device, add letter "A" in front of part number (e.g. OMA 7604ST).
OM7604ST
3.3 - 142
3.3
OM7604ST
ELECTRICAL CHARACTERISTICS
-55C T
A
125C (Note 1) unless otherwise specified
Test
Symbol
Conditions
Limits
Unit
Min.
Max.
Reference Voltage
V
REF
I
OUT
= 10mA
1.20
1.30
V
T
A
= 25C
3.0V (V
IN -
V
OUT
) 35V, P 30W
1.20
1.30
V
10mA I
OUT
3.0A (Note 2)
Line Regulation
V
OUT
3.0V (V
IN -
V
OUT
) 35V,
0.01
%/V
(Note 2)
V
IN
I
OUT
= 10mA, T
J
= 25C
3.0V (V
IN -
V
OUT
) 35V,
0.05
%/
I
OUT
= 10mA
Load Regulation
V
OUT
10mA I
OUT
3.0A,
17.5
mV
(Note 2)
I
OUT
V
OUT
5.0A, T
J
= 25C
10mA I
OUT
3.0A,
50
mV
V
OUT
5.0A
10mA I
OUT
3.0A,
0.35
%
V
OUT
5.0A, T
J
= 25C
10mA I
OUT
3.0A,
1.0
%
V
OUT
5.0A
Thermal Regulation
20ms pulse, T
A
=25C
0.01
%/W
Ripple Rejection
V
IN
V
OUT
= 10V, f = 120Hz
66
dB
(Note 3)
V
REF
C
ADJ
= 10F
Adjust Pin Current
I
Adj
100
A
Adjust Pin
I
Adj
10mA I
OUT
3.0A, I
OUT
= 10mA
5.0
A
Current Change
3.0V (V
IN -
V
OUT
) 35V
Miminum Load Current
I
MIN
(V
IN -
V
OUT
) = 35V
5.0
mA
Current Limit
I
CL
(V
IN -
V
OUT
) 10V
3.0
A
(V
IN -
V
OUT
) = 30V
0.3
A
Notes:
1. Unless otherwise specified, these specifications apply for (V
IN
- V
OUT
) = 5.0V and I
OUT
= 1.5A. Although power
dissipation is internally limited, these characteristics are applicable for power dissipation up to 30W.
2. Regulation is measured at a constant junction temperature using a pulse technique. Changes in output voltage
due to heating effects are covered under the specification for thermal regulation.
3. Guaranteed if not tested to the limits specified.
3.3 - 143
3.3
OM7604ST
TYPICAL PERFORMANCE CHARACTERISTICS
Voltage Change (Percent)
1.0
0
0.1
0.2
0.3
0.4
0.5
-75 -50 -25 0 25 50 75 100 125 150
Temperature (C)
Load Regulation
Current Limit
Adjustment Current (A)
65
60
55
50
45
40
35
30
-75
-25
25
75
125
Temperature (C)
Adjustment Current
Dropout Voltage
Reference Voltage (V)
1.27
1.26
1.25
1.24
1.23
-50 -25 -0 25 50 75 100 125 150
Temperature (C)
Temperature Stability
Minimum I
OUT
Current (mA)
5
4
3
2
1
0
0
5
10 15 20 25 30 35 40
Input-Output Diffential(V)
Minimum Operating Current
Ripple Rejection (dB
)
100
80
60
40
20
0
0
5
10
15
20 25 30 35
Output Voltage (V)
Ripple Rejection
Ripple Rejection (dB)
100
80
60
40
20
0
10
100
1k
10k
100k
1M
Frequency (Hz)
Ripple Rejection
Ripple Rejection (dB)
80
70
60
50
40
0.1
1
10
Output Current (A)
Ripple Rejection
Output Impedance (Ohms)
10
1
0.1
0.01
0.001
0.0001
10
100
1k
10k
100k
1M
Frequency (Hz)
Output Impedance
1.5
1
0.5
0
-0.5
-1
1
0.5
0
0
10
20
30
40
Time (s)
Line Transient Response
1.5
1
0.5
0
-0.5
-1
-1.5
1.5
1
0.5
0
0
10
20
30
40
Time (s)
Load Transient Response
Input Voltage
Change(V)
Output Voltage
(Deviation (V)
Load
Current (A)
Output Voltage
Deviation (V)
C
ADJ
= 10F
V
IN
- V
OUT
= 5V
V
OUT
= 500mA
f = 120Hz
T
J
= 25C
V
IN
= 15V
V
OUT
= 10V
f = 120Hz
T
CASE
= 25C
V
IN
= 15V, V
OUT
= 10V
Preload = 100mA
T
J
= 25C
V
IN
= 15V
V
OUT
= 10V
I
OUT
= 500mA
V
OUT
= 10V
I
OUT
= 50mA
T
J
= 25C
V
IN
= 15V
V
OUT
= 10V
I
OUT
= 500mA
C
ADJ
= 0
C
ADJ
= 10F
C
ADJ
= 0
C
ADJ
= 10F
C
OUT
= 10F
C
ADJ
= 0
C
OUT
= 0
C
OUT
= 1F
C
OUT
= 0
C
ADJ
= 10F
C
ADJ
= 0
C
ADJ
= 10F
C
ADJ
= 0
C
OUT
= 1F C
ADJ
= 10F
C
OUT
= 0 C
ADJ
= 0
Output Current (A)
6
4
2
0
0
5
10 15 20 25
30 35
Input-Output Differential (V)
I
OUT
= 3A
T
J
= 150C
T
J
= 25C
T
J
= -55C
T
J
= 150C
T
J
= 25C
T
J
= -55C
Input-Output Differential (V)
3
2.5
2
1.5
1
0.5
-75
-25
25
75
125
Temperature (C)
V
OUT
= 100 mV
I
OUT
= 3 A
I
OUT
= 2 A
I
OUT
= 20 mA
3.3
205 Crawford Street, Leominster, MA 01453 USA (508) 534-5776 FAX (508) 537-4246
OM7604ST
TYPICAL APPLICATIONS
.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
1 2 3
Tab
Front View
Pin 1:
Adjust
Pin 2:
V
OUT
Pin 3:
V
IN
Tab:
Isolated
NOTES
Case is metal/hermetically sealed
Isolated Tab
MECHANICAL OUTLINE
PIN CONNECTION
V
OUT
V
IN
V
IN
Adj
LT 301A
25
1k
25
121
365
100
p
F
5F
+
+
-
-
3
2
7
6
5V
RET
R
L
R
p
Return
1
8
(Max Drop 300mV)
V
OUT
V
IN
Adj
1K
500
0.5
V
OUT
V
OUT
V
IN
Adj
C1*
1F
C2
R1
240
R2
5k
1F
+
+
+
+
+ V
OUT
= 1.25V
(
1 +
)
R2
R1
*Needed if device is far
from filter capacitors.
+
l
+
l Optional - improves
transient response.
5V
*C1 improves ripple rejection,
X
C
should be small compared to R2.
1F
10f*
V
OUT
V
IN
V
IN
Adj
R2
365
1%
R1
121
1%
+ C1
1.2 - 2.5V Adjustable Regulator
Improving Ripple Rejection
Adjustable Current Limiter
Remote Sensing
4
V
IN
V
OUT
V
IN
V
IN
Adj
LT 1001
3
2
2.5V
LT 1009
4.99k
1%
15k
1%
2k
4
6
7
2k
+10V
Precision High Current Reference
+
-
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