LM138/LM338
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation
Input/Output Voltage Differential
Internally
limited
+40V, −0.3V
Storage Temperature
Lead Temperature
Metal Package (Soldering, 10
seconds)
Plastic Package (Soldering, 4
seconds)
ESD Tolerance
−65˚C to
+150˚C
300˚C
260˚C
TBD
Operating Temperature Range
LM138
−55˚C
≤
T
J
≤
+150˚C
LM338
0˚C
≤
T
J
≤
+125˚C
Electrical Characteristics
Specifications with standard type face are for T
J
= 25˚C, and those with
boldface type
apply over
full Operating Tempera-
ture Range.
Unless otherwise specified, V
IN
− V
OUT
= 5V; and I
OUT
= 10 mA. (Note 2)
Symbol
V
REF
V
RLINE
V
RLOAD
Parameter
Reference Voltage
Line Regulation
Load Regulation
Thermal Regulation
I
ADJ
∆I
ADJ
∆V
R/T
I
LOAD
(Min)
I
CL
Adjustment Pin Current
Adjustment Pin Current Change
Temperature Stability
Minimum Load Current
Current Limit
10 mA
≤
I
OUT
≤
5A,
3V
≤
(V
IN
− V
OUT
)
≤
35V
T
MIN
≤
T
J
≤
T
MAX
V
IN
− V
OUT
= 35V
V
IN
− V
OUT
≤
10V
DC
0.5 ms Peak
V
IN
− V
OUT
= 30V
V
N
RMS Output Noise, % of V
OUT
Ripple Rejection Ratio
10 Hz
≤
f
≤
10 kHz
V
OUT
= 10V, f = 120 Hz, C
ADJ
= 0 µF
V
OUT
= 10V, f = 120 Hz, C
ADJ
= 10 µF
Long-Term Stability
θ
JC
θ
JA
Thermal Resistance,
Junction to Case
Thermal Resistance, Junction to
Ambient (No Heat Sink)
K Package
35
˚C/W
T
J
= 125˚C, 1000 Hrs
K Package
60
5
7
8
12
1
0.003
60
75
0.3
1
1
1
A
A
A
%
dB
dB
%
˚C/W
1
3.5
5
%
mA
Conditions
Min
3V
≤
(V
IN
− V
OUT
)
≤
35V,
10 mA
≤
I
OUT
≤
5A, P
≤
50W
3V
≤
(V
IN
− V
OUT
)
≤
35V (Note 3)
10 mA
≤
I
OUT
≤
5A (Note 3)
20 ms Pulse
0.005
0.02
0.1
0.3
0.002
45
0.2
0.01
0.04
0.3
0.6
0.01
100
5
%/V
%/V
%
%
%/W
µA
µA
1.19
LM138
Typ
1.24
Max
1.29
V
Units
Electrical Characteristics
Symbol
V
REF
V
RLINE
V
RLOAD
Parameter
Reference Voltage
Line Regulation
Load Regulation
Conditions
Min
3V
≤
(V
IN
− V
OUT
)
≤
35V,
10 mA
≤
I
OUT
≤
5A, P
≤
50W
3V
≤
(V
IN
− V
OUT
)
≤
35V (Note 3)
10 mA
≤
I
OUT
≤
5A (Note 3)
0.005
0.02
0.1
0.3
0.03
0.06
0.5
1
%/V
%/V
%
%
1.19
LM338
Typ
1.24
Max
1.29
V
Units
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