LM138, LM338

SNVS771B – MAY 1998 – REVISED APRIL 2013

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These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Absolute Maximum Ratings

(1) (2) (3)

Power Dissipation

Internally limited

Input/Output Voltage Differential

+40V,

−0.3V

Storage Temperature

−65°C to +150°C

Lead Temperature

TO-3 Package (Soldering, 10 seconds)

300°C

TO-220 Package (Soldering, 4 seconds)

260°C

ESD Tolerance

TBD

(1)

Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for

which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test

conditions, see the Electrical Characteristics.

(2)

Refer to RETS138K drawing for military specifications of LM138K.

(3)

If Military/Aerospace specified devices are required, please contact the TI Sales Office/ Distributors for availability and specifications.

Operating Temperature Range

LM138

LM338

0°C

Electrical Characteristics

(1)

LM138

Symbol

Parameter

Conditions

Units

Min

Typ

Max

Reference Voltage

3V

1.19

1.24

1.29

V

10 mA

Line Regulation

3V

(2)

0.005

0.01

%/V

0.02

0.04

%/V

Load Regulation

10 mA

(2)

0.1

0.3

%

0.3

0.6

%

Thermal Regulation

20 ms Pulse

0.002

0.01

%/W

Adjustment Pin Current

45

100

μA

Adjustment Pin Current Change

10 mA

0.2

5

μA

3V

Temperature Stability

1

%

Minimum Load Current

3.5

5

mA

Current Limit

DC

5

8

A

0.5 ms Peak

7

12

A

1

1

A

10 Hz

≤ f ≤ 10 kHz

0.003

%

Ripple Rejection Ratio

60

dB

60

75

dB

Long-Term Stability

0.3

1

%

Thermal Resistance,

NDS Package

1

°C/W

Junction to Case

(1)

These specifications are applicable for power dissipations up to 50W for the TO-3 (NDS) package and 25W for the TO-220 (NDE)

package. Power dissipation is specified at these values up to 15V input-output differential. Above 15V differential, power dissipation will

be limited by internal protection circuitry. All limits (i.e., the numbers in the Min. and Max. columns) are specified to TI's AOQL (Average

Outgoing Quality Level).

(2)

Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to

heating effects are covered under the specifications for thermal regulation.

2

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