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This is information on a product in full production. 

March 2014

DocID2154 Rev 19

1/25

LM217, LM317

1.2 V to 37 V adjustable voltage regulators

Datasheet 

-

 production data

Features

Output voltage range: 1.2 to 37 V

Output current in excess of 1.5 A

0.1 % line and load regulation

Floating operation for high voltages

Complete series of protections: current limiting, 
thermal shutdown and SOA control

Description

The LM217, LM317 are monolithic integrated 
circuits in TO-220, TO-220FP and D PAK 
packages intended for use as positive adjustable 
voltage regulators. They are designed to supply 
more than 1.5 A of load current with an output 
voltage adjustable over a 1.2 to 37 V range. The 
nominal output voltage is selected by means of a 
resistive divider, making the device exceptionally 
easy to use and eliminating the stocking of many 
fixed regulators.

TO-220

TO-220FP

D PAK

Table 1. Device summary

Order codes

TO-220 (single gauge)

TO-220 (double gauge)

D PAK (tape and reel)

TO-220FP

LM217T

LM217T-DG

LM217D2T-TR

LM317T

LM317T-DG

LM317D2T-TR

LM317P

LM317BT

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Contents

LM217, LM317

2/25

DocID2154 Rev 19

Contents

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DocID2154 Rev 19

3/25

LM217, LM317

Pin configuration

25

Pin configuration  

Figure 1. Pin connections (top view)

         

72)3

72

'ð3$.

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Maximum ratings

LM217, LM317

4/25

DocID2154 Rev 19

2 Maximum 

ratings

 

Note:

Absolute maximum ratings are those values beyond which damage to the device may occur. 
Functional operation under these condition is not implied.

Table 2. Absolute maximum ratings

Symbol

Parameter

Value

Unit

V

- V

O

Input-reference differential voltage

40

V

I

O

Output current

Internally limited

A

T

OP

Operating junction temperature for:

LM217

- 25 to 150

C

LM317

0 to 125

LM317B

-40 to 125

P

D

Power dissipation

Internally limited

T

STG

Storage temperature

- 65 to 150

C

Table 3. Thermal data

Symbol

Parameter

D PAK

TO-220

TO-220FP

Unit

R

thJC

Thermal resistance junction-case

3

5

5

C/W

R

thJA

Thermal resistance junction-ambient

62.5

50

60

C/W

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DocID2154 Rev 19

5/25

LM217, LM317

Diagram

25

3 Diagram

 

Figure 2. Schematic diagram

         

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Electrical characteristics

LM217, LM317

6/25

DocID2154 Rev 19

4 Electrical 

characteristics

V

I

 - V

O

 = 5 V, I

O

 = 500 mA, I

MAX

 = 1.5 A and P

MAX

 = 20 W, T

J

 = - 55 to 150 C, unless 

otherwise specified.

          

Table 4. Electrical characteristics for LM217

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Δ

V

O

Line regulation

V

I

 - V

O

 = 3 to 40 V

T

J

 = 25 C

0.01

0.02

%/V

0.02

0.05

Δ

V

O

Load regulation

V

O

 

5 V

I

O

 = 10 mA to I

MAX

T

J

 = 25 C

5

15

mV

20

50

V

O

 

5 V,

I

O

 = 10 mA to I

MAX

T

J

 = 25 C

0.1

0.3

%

0.3

1

I

ADJ

Adjustment pin current

50

100

A

Δ

I

ADJ

Adjustment pin current

V

I

 - V

O

 = 2.5 to 40V    I

O

 = 10 mA to I

MAX

0.2

5

A

V

REF

Reference voltage

V

I

 - V

O

 = 2.5 to 40V I

O

= 10 mA to I

MAX

P

D

 

 P

MAX

1.2

1.25

1.3

V

Δ

V

O

/V

O

Output voltage 
temperature stability

1

%

I

O(min)

Minimum load current

V

I

 - V

= 40 V

3.5

5

mA

I

O(max)

Maximum load current

V

I

 - V

O

 ≤

 15 V, P

D

 

<

 P

MAX

1.5

2.2

A

V

I

 - V

= 40 V, P

D

 

<

 P

MAX

, T

J

 = 25 C

0.4

eN

Output noise voltage 
(percentage of V

O

)

B = 10Hz to 100kHz, T

J

 = 25 C

0.003

%

SVR

Supply voltage rejection 

(1)

T

J

 = 25 C, f = 120Hz

C

ADJ

=0

65

dB

C

ADJ

=10 F

66

80

1.

C

ADJ

 is connected between adjust pin and ground.

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DocID2154 Rev 19

7/25

LM217, LM317

Electrical characteristics

25

V

- V

O

 = 5 V, I

O

 = 500 mA, I

MAX

 = 1.5 A and P

MAX

 = 20 W, T

J

 = 0 to 125  C, unless 

otherwise specified.

          

Table 5. Electrical characteristics for LM317

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Δ

V

O

Line regulation

V

I

 - V

O

 = 3 to 40 V

T

J

 = 25 C

0.01

0.04

%/V

0.02

0.07

Δ

V

O

Load regulation

V

O

 

≤ 

5 V

I

O

 = 10 mA to I

MAX

T

J

 = 25 C

5

25

mV

20

70

V

O

 

5 V,

I

O

 = 10 mA to I

MAX

T

J

 = 25 C

0.1

0.5

%

0.3

1.5

I

ADJ

Adjustment pin current

50

100

A

Δ

I

ADJ

Adjustment pin current

V

I

 - V

O

 = 2.5 to 40V, 

I

O

 = 10 mA to 500mA

0.2

5

A

V

REF

Reference voltage 
(between pin 3 and pin 1)

V

I

 - V

O

 = 2.5 to 40V I

O

 = 10 mA to 500mA 

P

D

 

 P

MAX

1.2

1.25

1.3

V

Δ

V

O

/V

O

Output voltage 
temperature stability

1

%

I

O(min)

Minimum load current

V

I

 - V

= 40 V

3.5

10

mA

I

O(max)

Maximum load current

V

I

 - V

O

 ≤

 15 V, P

D

 

<

 P

MAX

1.5

2.2

A

V

I

 - V

= 40 V, P

D

 

<

 P

MAX

, T

J

 = 25 C

0.4

eN

Output noise voltage 
(percentage of V

O

)

B = 10Hz to 100kHz, T

J

 = 25 C

0.003

%

SVR

Supply voltage rejection 

(1)

T

J

 = 25 C, f = 120Hz

C

ADJ

=0

65

dB

C

ADJ

=10 F

66

80

1.

C

ADJ

 is connected between adjust pin and ground.

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Electrical characteristics

LM217, LM317

8/25

DocID2154 Rev 19

V

- V

O

 = 5 V, I

O

 = 500 mA, I

MAX

 = 1.5 A and P

MAX

 = 20 W, T

J

 = - 40 to 125  C, unless 

otherwise specified.

         

Table 6. Electrical characteristics for LM317B

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Δ

V

O

Line regulation

V

I

 - V

O

 = 3 to 40 V

T

J

 = 25 C

0.01

0.04

%/V

0.02

0.07

Δ

V

O

Load regulation

V

O

 

≤ 

5 V

I

O

 = 10 mA to I

MAX

T

J

 = 25 C

5

25

mV

20

70

V

O

 

5 V,

I

O

 = 10 mA to I

MAX

T

J

 = 25 C

0.1

0.5

%

0.3

1.5

I

ADJ

Adjustment pin current

50

100

A

Δ

I

ADJ

Adjustment pin current

V

I

 - V

O

 = 2.5 to 40V, 

I

O

 = 10 mA to 500mA

0.2

5

A

V

REF

Reference voltage 
(between pin 3 and pin 1)

V

I

 - V

O

 = 2.5 to 40V I

O

 = 10 mA to 500mA 

P

D

 

 P

MAX

1.2

1.25

1.3

V

Δ

V

O

/V

O

Output voltage 
temperature stability

1

%

I

O(min)

Minimum load current

V

I

 - V

= 40 V

3.5

10

mA

I

O(max)

Maximum load current

V

I

 - V

O

 ≤

 15 V, P

D

 

<

 P

MAX

1.5

2.2

A

V

I

 - V

= 40 V, P

D

 

<

 P

MAX

, T

J

 = 25 C

0.4

eN

Output noise voltage 
(percentage of V

O

)

B = 10Hz to 100kHz, T

J

 = 25 C

0.003

%

SVR

Supply voltage rejection 

(1)

T

J

 = 25 C, f = 120Hz

C

ADJ

=0

65

dB

C

ADJ

=10 F

66

80

1.

C

ADJ

 is connected between adjust pin and ground.

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DocID2154 Rev 19

9/25

LM217, LM317

Typical characteristics

25

5 Typical 

characteristics

          

Figure 3. Output current vs. input-output 

differential voltage

Figure 4. Dropout voltage vs. junction 

temperature

         

         

Figure 5. Reference voltage vs. junction

         

Figure 6. Basic adjustable regulator 

         

,QSXW

,QSXW

2XWSXW

2XWSXW

$GM

$GM

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Application information

LM217, LM317

10/25

DocID2154 Rev 19

6 Application 

information

The LM217, LM317 provides an internal reference voltage of 1.25 V between the output and 
adjustments terminals. This is used to set a constant current flow across an external resistor 
divider (see

), giving an output voltage V

O

 of: 

V

O

 = V

REF

 (1 + R

2

/R

1

) + I

ADJ

 R

2

The device was designed to minimize the term I

ADJ

 (100  A max) and to maintain it very 

constant with line and load changes. Usually, the error term I

ADJ

 × R

2

 can be neglected. To 

obtain the previous requirement, all the regulator quiescent current is returned to the output 
terminal, imposing a minimum load current condition. If the load is insufficient, the output 
voltage will rise. Since the LM217, LM317 is a floating regulator and "sees" only the input-to-
output differential voltage, supplies of very high voltage with respect to ground can be 
regulated as long as the maximum input-to-output differential is not exceeded. Furthermore, 
programmable regulators are easily obtainable and, by connecting a fixed resistor between 
the adjustment and output, the device can be used as a precision current regulator. In order 
to optimize the load regulation, the current set resistor R

1

 (see

) should be tied as 

close as possible to the regulator, while the ground terminal of R

2

 should be near the ground 

of the load to provide remote ground sensing. Performance may be improved with added 
capacitance as follow:

An input bypass capacitor of 0.1 F

An adjustment terminal to ground 10  F capacitor to improve the ripple rejection of 
about 15 dB (C

ADJ

).

An 1  F tantalum (or 25  F Aluminium electrolytic) capacitor on the output to improve 
transient response. In addition to external capacitors, it is good practice to add 
protection diodes, as shown in 

 D1 protect the device against input short 

circuit, while D2 protect against output short circuit for capacitance discharging.

Note:

D1 protect the device against input short circuit, while D2 protects against output short 
circuit for capacitors discharging.

Figure 7. Voltage regulator with protection diodes

         

**OQVU

OQVU

0VUQVU

VUQVU

"EKVTU

EKVTU

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DocID2154 Rev 19

11/25

LM217, LM317

Application information

25

I

O

 = (V

REF

 / R

1

) + I

ADJ

 = 1.25 V / R

1

Figure 8. Slow turn-on 15 V regulator 

         

**OQVU

OQVU

0VUQVU

VUQVU

"EKVTU

EKVTU

Figure 9. Current regulator

         

**OQVU

OQVU

0VUQVU

VUQVU

"EKVTU

EKVTU

Figure 10. 5 V electronic shut-down regulator

         

**OQVU

OQVU

0VUQVU

VUQVU

"EKVTU

EKVTU

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Application information

LM217, LM317

12/25

DocID2154 Rev 19

(R

2

 sets maximum V

O

)

* R

S

 sets output impedance of charger Z

O

 = R

S

 (1 + R

2

/R

1

). Use of R

S

 allows low charging rates whit fully 

charged battery.

Figure 11. Digitally selected outputs

         

**OQVU

OQVU

0VUQVU

VUQVU

"EKVTU

EKVTU

Figure 12. Battery charger (12 V) 

         

**OQVU

OQVU

0VUQVU

VUQVU

"EKVTU

EKVTU

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DocID2154 Rev 19

13/25

LM217, LM317

Application information

25

* R3 sets peak current (0.6 A for 1 0).

** C1 recommended to filter out input transients.

Figure 13. Current limited 6 V charger

         

**OQVU

OQVU

0VUQVU

VUQVU

"EKVTU

EKVTU

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Package mechanical data

LM217, LM317

14/25

DocID2154 Rev 19

Package mechanical data

In order to meet environmental requirements, ST offers these devices in different grades of 
ECOPACK

 packages, depending on their level of environmental compliance. ECOPACK

 

specifications, grade definitions and product status are available at: 

ECOPACK

 is an ST trademark.

Figure 14. TO-220 (single gauge) drawing

BUHY'

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DocID2154 Rev 19

15/25

LM217, LM317

Package mechanical data

25

Table 7. TO-220 (single gauge) mechanical data

Dim.

mm

Min.

Typ.

Max.

A

4.40

4.60

b

0.61

0.88

b1

1.14

1.70

c

0.48

0.70

D

15.25

15.75

E

10

10.40

e

2.40

2.70

e1

4.95

5.15

F

0.51

0.60

H1

6.20

6.60

J1

2.40

2.72

L

13

14

L1

3.50

3.93

L20

16.40

L30

28.90

P

3.75

3.85

Q

2.65

2.95

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Package mechanical data

LM217, LM317

16/25

DocID2154 Rev 19

Figure 15.  TO-220 (dual gauge) drawing

BW\SH$B5HYB7

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DocID2154 Rev 19

17/25

LM217, LM317

Package mechanical data

25

Table 8. TO-220 (dual gauge) mechanical data

Dim.

mm

Min.

Typ.

Max.

A

4.40

4.60

b

0.61

0.88

b1

1.14

1.70

c

0.48

0.70

D

15.25

15.75

D1

1.27

E

10

10.40

e

2.40

2.70

e1

4.95

5.15

F

1.23

1.32

H1

6.20

6.60

J1

2.40

2.72

L

13

14

L1

3.50

3.93

L20

16.40

L30

28.90

P

3.75

3.85

Q

2.65

2.95

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Package mechanical data

LM217, LM317

18/25

DocID2154 Rev 19

Figure 16. TO-220FP drawing

7012510_Rev_K

A

B

H

Dia

L7

D

E

L6

L5

L2

L3

L4

F1

F2

F

G

G1

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DocID2154 Rev 19

19/25

LM217, LM317

Package mechanical data

25

Table 9. TO-220FP mechanical data

Dim.

mm

Min.

Typ.

Max.

A

4.4

4.6

B

2.5

2.7

D

2.5

2.75

E

0.45

0.7

F

0.75

1

F1

1.15

1.70

F2

1.15

1.70

G

4.95

5.2

G1

2.4

2.7

H

10

10.4

L2

16

L3

28.6

30.6

L4

9.8

10.6

L5

2.9

3.6

L6

15.9

16.4

L7

9

9.3

Dia

3

3.2

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Package mechanical data

LM217, LM317

20/25

DocID2154 Rev 19

Figure 17. D PAK drawing

0079457_T

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DocID2154 Rev 19

21/25

LM217, LM317

Package mechanical data

25

Table 10. D PAK mechanical data

Dim.

mm

Min.

Typ.

Max.

A

4.40

4.60

A1

0.03

0.23

b

0.70

0.93

b2

1.14

1.70

c

0.45

0.60

c2

1.23

1.36

D

8.95

9.35

D1

7.50

E

10

10.40

E1

8.50

e

2.54

e1

4.88

5.28

H

15

15.85

J1

2.49

2.69

L

2.29

2.79

L1

1.27

1.40

L2

1.30

1.75

R

0.4

V2

0

8

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Packaging mechanical data

LM217, LM317

22/25

DocID2154 Rev 19

Packaging mechanical data

Figure 18. Tape for D PAK

P1

A0

D1

P0

F

W

E

D

B0

K0

T

User direction of feed

P2

10 pitches cumulative
tolerance on tape +/- 0.2 mm

User direction of feed

R

Bending radius

B1

For machine ref. only
including draft and
radii concentric around B0

AM08852v1

Top cover
tape

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DocID2154 Rev 19

23/25

LM217, LM317

Packaging mechanical data

25

Figure 19. Reel for D PAK

Table 11. D PAK tape and reel mechanical data

Tape

Reel

Dim.

mm

Dim.

mm

Min.

Max.

Min.

Max.

A0

10.5

10.7

A

330

B0

15.7

15.9

B

1.5

D

1.5

1.6

C

12.8

13.2

D1

1.59

1.61

D

20.2

E

1.65

1.85

G

24.4

26.4

F

11.4

11.6

N

100

K0

4.8

5.0

T

30.4

P0

3.9

4.1

P1

11.9

12.1

Base qty

1000

P2

1.9

2.1

Bulk qty

1000

R

50

T

0.25

0.35

W

23.7

24.3

A

D

B

Full radius

G measured at hub

C

N

REEL DIMENSIONS

40mm min.

Access hole

At sl ot location

T

Tape slot 
in core for
tape start 25 mm min.
width

AM08851v2

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Revision history

LM217, LM317

24/25

DocID2154 Rev 19

Revision history  

Table 12. Document revision history

Date

Revision

Changes

01-Sep-2004

10

Mistake V

REF

 ==> V

O

, tables 1, 4 and 5.

19-Jan-2007

11

D PAK mechanical data has been updated, add footprint data and the 
document has been reformatted.

13-Jun-2007

12

Change values 

Δ

I

ADJ

 and V

REF 

test condition of I

O

 = 10 mA to I

MAX

 ==> 

I

O

 = 10 mA to 500 mA

.

23-Nov-2007

13

Added 

06-Feb-2008

14

Added: TO-220 mechanical data 

Figure 14 on page 14

 and 

Table 6 on 

page 13

.

02-Mar-2010

15

Added: notes 

Figure 14 on page 14

Figure 15 on page 15

Figure 16

 and 

Figure 17 on page 16

.

17-Nov-2010

16

Modified: R

thJC

 value for TO-220 

.

18-Nov-2011

17

Added: order code LM317T-DG

.

13-Feb-2012

18

Added: order code LM217T-DG

.

12-Mar-2014

19

The part number LM117 has been moved to a separate datasheet.

Removed TO-3 package.

Updated the description in cover page 

Modified 

.

Added 

.

Minor text changes.

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DocID2154 Rev 19

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Please Read Carefully:

Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (ST) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.

All ST products are sold pursuant to STs terms and conditions of sale.

Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.

No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.

UNLESS OTHERWISE SET FORTH IN STS TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
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ST PRODUCTS ARE NOT DESIGNED OR AUTHORIZED FOR USE IN: (A) SAFETY CRITICAL APPLICATIONS SUCH AS LIFE
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EXPRESSLY DESIGNATED BY ST AS BEING INTENDED FOR AUTOMOTIVE, AUTOMOTIVE SAFETY OR MEDICAL INDUSTRY
DOMAINS ACCORDING TO ST PRODUCT DESIGN SPECIFICATIONS. PRODUCTS FORMALLY ESCC, QML OR JAN QUALIFIED ARE
DEEMED SUITABLE FOR USE IN AEROSPACE BY THE CORRESPONDING GOVERNMENTAL AGENCY.

Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
liability of ST.

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