LT138A/LT339A
LM138/LM338
ELECTRICAL CHARACTERISTICS
SYMBOL
I
ADJ
ΔI
ADJ
PARAMETER
Adjust Pin Current
Adjust Pin Current Change
Minimum Load Current
I
SC
Current Limit
10mA ≤ I
OUT
≤ 5A,
3V ≤ (V
IN
– V
OUT
) ≤ 35V
(V
IN
– V
OUT
) = 35V
(V
IN
– V
OUT
) ≤ 10V
DC
0.5ms Peak
(V
IN
– V
OUT
) = 30V, T
J
= 25ºC
ΔV
OUT
ΔTemp
ΔV
OUT
ΔTime
e
n
θ
JC
Temperature Stability
Long-Term Stability
T
A
= 125ºC, 1000 Hours
l
CONDITIONS
l
l
l
l
l
MIN
LT138A
TYP
45
0.2
3.5
MAX
100
5
10
MIN
LM138
TYP
45
0.2
3.5
MAX
100
5
10
UNITS
μA
μA
mA
A
A
A
%
5
6
8
12
1
1
0.3
0.001
1
2
2
1
5
6
8
12
1
1
0.3
0.003
1
1
%
%
ºC/W
RMS Output Noise (% of V
OUT
) 10HZ ≤ f ≤ 10kHz
Thermal Resistance
Junction-to-Case
K Package
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Unless otherwise specified, these specifications apply: V
IN
– V
OUT
= 5V and I
OUT
= 2.5A. These specifications are applicable for power
dissipations up to 50W.
Note 3:
See thermal regulation specifications for changes in output voltage
due to heating effects. Load and line regulation are measured at a constant
junction temperature by low duty cycle pulse testing.
TYPICAL PERFORMANCE CHARACTERSITICS
Load Regulation
0.2
OUTPUT VOLTAGE DEVIATION (%)
0.1
0
–0.1
–0.2
–0.3
–0.4
–75 –50 –25
INPUT-OUTPUT DIFFERENTIAL (V)
V
IN
= 15V
V
OUT
= 10V
PRELOAD = 50mA
I
OUT
= 3A
I
OUT
= 5A
4
Dropout Voltage
ΔV
OUT
= 100mV
ADJUSTMENT CURRENT (μA)
65
60
55
50
45
40
35
1
–75 –50 –25
30
0 25 50 75 100 125 150
TEMPERATURE (°C)
138/338 G02
Adjustment Current
3
I
OUT
= 5A
I
OUT
= 3A
2
I
OUT
= 1A
0 25 50 75 100 125 150
TEMPERATURE (°C)
138/338 G01
–75
–25
25
75
TEMPERATURE (°C)
125
138A/338A G03
138afc
4
LINER [ LINEAR TECHNOLOGY ]
