LT138A/LT338A
LM138/LM338
ABSOLUTE AXI U RATI GS (Note 1)
Power Dissipation .............................. Internally Limited
Input-to-Output Voltage Differential ........................ 35V
Operating Junction Temperature Range
LT138A/LM138 ............................... – 55°C to 150°C
LT338A/LM338 ................................... 0°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PRECONDITIONI G
100% Thermal Limit Burn-In
PACKAGE/ORDER I FOR ATIO
BOTTOM VIEW
VIN
ORDER
PART NUMBER
2
1
ADJ
CASE
IS OUTPUT
LT138AK
LT338AK
LM138K
LM338K
K PACKAGE
2-LEAD TO-3 METAL CAN
TJMAX = 150°C, θJA = 35°C/ W, θJC = 1°C/ W (LT138A/LT138)
TJMAX = 125°C, θJA = 35°C/ W, θJC = 1°C/ W (LT338A/LT338)
OBSOLETE PACKAGE
Consider the P Package for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
FRONT VIEW
3
2
1
P PACKAGE
3-LEAD PLASTIC TO-3P
TJMAX = 125°C, θJA = 45°C/ W
ORDER
PART NUMBER
LM338P
VOUT
VIN
ADJ
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
SYMBOL PARAMETER
VREF
Reference Voltage
∆VOUT
∆VIN
∆VOUT
∆IOUT
Line Regulation
Load Regulation
Thermal Regulation
Ripple Rejection
IADJ
∆IADJ
Adjust Pin Current
Adjust Pin Current Change
Minimum Load Current
CONDITIONS
LT138A
MIN TYP MAX
IOUT = 10mA, TJ = 25°C
1.238 1.250 1.262
3V ≤ (VIN – VOUT) ≤ 35V,
10mA ≤ IOUT ≤ 5A, P ≤ 50W
q 1.225 1.250 1.270
3V ≤ (VIN – VOUT) ≤ 35V, (Note 3)
q
0.005 0.01
0.02 0.04
10mA ≤ IOUT ≤ 5A, (Note 3)
VOUT ≤ 5V
VOUT ≥ 5V
VOUT ≤ 5V
q
VOUT ≥ 5V
q
20ms Pulse
5
15
0.1 0.3
20 30
0.3 0.6
0.002 0.01
VOUT = 10V, f = 120Hz
CADJ = 0µF
CADJ = 10µF
q
q 60
q
60
75
45 100
10mA ≤ IOUT ≤ 5A,
q
3V ≤ (VIN – VOUT) ≤ 35V
(VIN – VOUT) = 35V
q
0.2 5
3.5 5
LM138
MIN TYP MAX
1.19 1.24 1.29
0.005 0.01
0.02 0.04
5
15
0.1 0.3
20 30
0.3 0.6
0.002 0.01
60
60 75
45 100
0.2 5
3.5 5
2
UNITS
V
V
%/V
%/V
mV
%
mV
%
%/W
dB
dB
µA
µA
mA
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