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