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LT338AK

5A Positive Adjustable Voltage Regulator

Linear Technology 

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

138afb

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