LM117, LM317-N

SNVS774P – MAY 2004 – REVISED OCTOBER 2015

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7.5 Thermal Information, LM317-N

LM317-N

KTT

NDE

DCY

NDT

NDP

UNIT

(TO-263)

(TO-220)

(SOT-223)

(TO)

(TO-252)

3 PINS

3 PINS

4 PINS

3 PINS

3 PINS

Junction-to-ambient thermal resistance

41.0

23.3

59.6

54

°C/W

Junction-to-case (top) thermal resistance

43.6

16.2

39.3

21

51.3

°C/W

Junction-to-board thermal resistance

23.6

4.9

8.4

—

28.6

°C/W

Junction-to-top characterization parameter

10.4

2.7

1.8

—

3.9

°C/W

Junction-to-board characterization parameter

22.6

4.9

8.3

—

28.1

°C/W

Junction-to-case (bottom) thermal resistance

0.9

1.1

—

—

0.9

°C/W

(1)

For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report, SPRA953.

(2)

When surface mount packages are used (SOT-223, TO-252), the junction to ambient thermal resistance can be reduced by increasing

the PCB copper area that is thermally connected to the package. See Heatsink Requirements for heatsink techniques.

(3)

No heatsink

7.6 LM117 Electrical Characteristics

(1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

3 V

Reference voltage

1.2

1.25

1.3

V

10 mA

0.01

0.02

Line regulation

3 V

(3)

%/V

over full operating

0.02

0.05

temperature range

0.1%

0.3%

Load regulation

10 mA

(1) (3)

over full operating

0.3%

1%

temperature range

Thermal regulation

20-ms pulse

0.03

0.07

%/W

Adjustment pin current

over full operating temperature range

50

100

μA

10 mA

(1)

Adjustment pin current change

0.2

5

μA

3 V

Temperature stability

1%

Minimum load current

3.5

5

mA

TO-3 Package (over full

1.5

2.2

3.4

operating temperature range)

A

TO-39 Package (over full

0.5

0.8

1.8

Current limit

operating temperature range)

TO-3 package

0.3

0.4

A

TO-39 package

0.15

0.2

10 Hz

≤ f ≤ 10 kHz

0.003%

65

dB

temperature range)

Ripple rejection ratio

66

80

dB

temperature range)

Long-term stability

0.3%

1%

(1)

(2)

Specifications and availability for military and space grades of LM117/883 can be found in the LM117QML data sheet (SNVS356).

Specifications and availability for military and space grades of LM117 can be found in the LM117JAN data sheet (SNVS365).

(3)

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.

6

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