LT138A/LT339A

LM138/LM338

4

138afd

For more information www.linear.com/LT138A

SYMBOL

PARAMETER

CONDITIONS

MIN

LT138A

TYP

MAX

MIN

LM138

TYP

MAX

UNITS

Ripple Rejection

l

l

60

60

75

60

60

75

dB

dB

Adjust Pin Current

l

45

100

45

100

µA

Adjust Pin Current Change

l

0.2

5

0.2

5

µA

Minimum Load Current

l

3.5

10

3.5

10

mA

Current Limit

DC

0.5ms Peak

l

l

5

6

8

12

5

6

8

12

A

A

1

2

1

A

ΔTemp

Temperature Stability

l

1

2

1

%

ΔTime

Long-Term Stability

0.3

1

0.3

1

%

10Hz ≤ f ≤ 10kHz

0.001

0.003

%

Thermal Resistance

Junction-to-Case

K Package

1

1

ºC/W

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.

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 characTerisTics

Load Regulation

Dropout Voltage

Adjustment Current

TEMPERATURE (°C)

–75

–0.4

–0.3

–0.1

0

0.1

–25

25 50

150

138/338 G01

–0.2

–50

0

75 100 125

0.2

PRELOAD = 50mA

TEMPERATURE (°C)

–75

1

3

–25

25 50

150

138/338 G02

2

–50

0

75 100 125

4

TEMPERATURE (°C)

–75

35

40

45

75

65

138A/338A G03

30

–25

25

125

50

55

60