LM317T-DG - STMicroelectronics, Inc.

February 2012 Doc ID 2154 Rev 18 1/25

LM117

LM217, LM317

1.2 V to 37 V adjustable voltage regulators

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 LM117, LM217, LM317 are monolithic

integrated circuits in TO-220, TO-220FP, TO-3

and D²PAK 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 only a resistive divider, making the

device exceptionally easy to use and eliminating

the stocking of many fixed regulators.

TO-220FP

D²PAK

TO-220

TO-3

Table 1. Device summary

Order codes

TO-220 D²PAK (tape and reel) TO-220FP TO-3

LM117K

LM217T LM217T-DG (1) LM217D2T-TR LM217K

LM317T LM317T-DG (1) LM317D2T-TR LM317P LM317K

1. TO-220 Dual Gauge frame.

www.st.com

Contents LM117, LM217, LM317

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Contents

1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

LM117, LM217, LM317 Pin configuration

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1 Pin configuration

Figure 1. Pin connections (top view)

TO-220FP

TO-3

TO-220

D²PAK (Any Type)

Maximum ratings LM117, LM217, LM317

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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

VI - VOInput-reference differential voltage 40 V

IOOutput current Internally limited

TOP Operating junction temperature for:

LM117 - 55 to 150

°CLM217 - 25 to 150

LM317 0 to 125

PDPower dissipation Internally limited

TSTG Storage temperature - 65 to 150 °C

Table 3. Thermal data

Symbol Parameter D²PAK TO-220 TO-220FP TO-3 Unit

RthJC Thermal resistance junction-case 3 5 5 4 °C/W

RthJA Thermal resistance junction-ambient 62.5 50 60 35 °C/W

LM117, LM217, LM317 Diagram

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3 Diagram

Figure 2. Schematic diagram

Electrical characteristics LM117, LM217, LM317

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4 Electrical characteristics

VI - VO = 5 V, IO = 500 mA, IMAX = 1.5 A and PMAX = 20 W, TJ = - 55 to 150 °C for LM117,

TJ = - 25 to 150 °C for LM217, unless otherwise specified.

Table 4. Electrical characteristics for LM117/LM217

Symbol Parameter Test conditions Min. Typ. Max. Unit

ΔVOLine regulation VI - VO = 3 to 40 V TJ = 25°C 0.01 0.02 %/V

0.02 0.05

ΔVOLoad regulation

VO ≤5 V

IO = 10 mA to IMAX

TJ = 25°C 5 15 mV

20 50

VO ≥5 V,

IO = 10 mA to IMAX

TJ = 25°C 0.1 0.3 %

0.3 1

IADJ Adjustment pin current 50 100 µA

ΔIADJ Adjustment pin current VI - VO = 2.5 to 40V IO = 10 mA to IMAX 0.2 5 µA

VREF

Reference voltage

(between pin 3 and pin 1)

VI - VO = 2.5 to 40V IO= 10 mA to IMAX

PD ≤ PMAX

1.2 1.25 1.3 V

ΔVO/VO

Output voltage

temperature stability 1%

IO(min) Minimum load current VI - VO = 40 V 3.5 5 mA

IO(max) Maximum load current VI - VO ≤ 15 V, PD < PMAX 1.5 2.2 A

VI - VO = 40 V, PD < PMAX, TJ = 25°C 0.4

eN Output noise voltage

(percentage of VO)B = 10Hz to 100kHz, TJ = 25°C 0.003 %

SVR Supply voltage rejection (1) TJ = 25°C, f = 120Hz CADJ=0 65 dB

CADJ=10µF 66 80

1. CADJ is connected between pin 1 and ground.

LM117, LM217, LM317 Electrical characteristics

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VI - VO = 5 V, IO = 500 mA, IMAX = 1.5 A and PMAX = 20 W, TJ = 0 to 125°C, unless otherwise

specified.

Table 5. Electrical characteristics for LM317

Symbol Parameter Test conditions Min. Typ. Max. Unit

ΔVOLine regulation VI - VO = 3 to 40 V TJ = 25°C 0.01 0.04 %/V

0.02 0.07

ΔVOLoad regulation

VO ≤ 5 V

IO = 10 mA to IMAX

TJ = 25°C 5 25 mV

20 70

VO ≥5 V,

IO = 10 mA to IMAX

TJ = 25°C 0.1 0.5 %

0.3 1.5

IADJ Adjustment pin current 50 100 µA

ΔIADJ Adjustment pin current VI - VO = 2.5 to 40V,

IO = 10 mA to 500mA 0.2 5 µA

VREF

Reference voltage

(between pin 3 and pin 1)

VI - VO = 2.5 to 40V IO = 10 mA to 500mA

PD ≤ PMAX

1.2 1.25 1.3 V

ΔVO/VO

Output voltage

temperature stability 1%

IO(min) Minimum load current VI - VO = 40 V 3.5 10 mA

IO(max) Maximum load current VI - VO ≤ 15 V, PD < PMAX 1.5 2.2 A

VI - VO = 40 V, PD < PMAX, TJ = 25°C 0.4

eN Output noise voltage

(percentage of VO)B = 10Hz to 100kHz, TJ = 25°C 0.003 %

SVR Supply voltage rejection (1) TJ = 25°C, f = 120Hz CADJ=0 65 dB

CADJ=10µF 66 80

1. CADJ is connected between pin 1 and ground.

Typical characteristics LM117, LM217, LM317

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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

LM117, LM217, LM317 Application information

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6 Application information

The LM117, 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

Figure 3

), giving an output voltage VO of:

VO = VREF (1 + R2/R1) + IADJ R2

The device was designed to minimize the term IADJ (100 µA max) and to maintain it very

constant with line and load changes. Usually, the error term IADJ × R2 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 LM117, 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 regulator 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 R1 (see

Figure 3

)

should be tied as close as possible to the regulator, while the ground terminal of R2 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 µF

An adjustment terminal to ground 10 µF capacitor to improve the ripple rejection of about 15

dB (CADJ).

An 1 µF tantalum (or 25 µF Aluminium electrolytic) capacitor on the output to improve

transient response. In additional to external capacitors, it is good practice to add protection

diodes, as shown in

Figure 4

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

Application information LM117, LM217, LM317

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IO = (VREF / R1) + IADJ = 1.25 V / R1

Figure 8. Slow turn-on 15 V regulator

Figure 9. Current regulator

Figure 10. 5 V electronic shut-down regulator

LM117, LM217, LM317 Application information

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(R2 sets maximum VO)

* RS sets output impedance of charger ZO = RS (1 + R2/R1). Use of RS allows low charging rates whit fully

charged battery.

Figure 11. Digitally selected outputs

Figure 12. Battery charger (12 V)

Application information LM117, LM217, LM317

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

** C1 recommended to filter out input transients.

Figure 13. Current limited 6 V charger

LM117, LM217, LM317 Package mechanical data

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7 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:

www.st.com

ECOPACK® is an ST trademark.

Table 6. TO-220 mechanical data

Dim.

Type STD - ST Dual Gauge Type STD - ST Single Gauge

mm. mm.

Min. Typ. Max. Min. Typ. Max.

A 4.40 4.60 4.40 4.60

b 0.61 0.88 0.61 0.88

b1 1.14 1.70 1.14 1.70

c 0.48 0.70 0.48 0.70

D 15.25 15.75 15.25 15.75

D1 1.27

E 10.00 10.40 10.00 10.40

e 2.40 2.70 2.40 2.70

e1 4.95 5.15 4.95 5.15

F 1.23 1.32 0.51 0.60

H1 6.20 6.60 6.20 6.60

J1 2.40 2.72 2.40 2.72

L 13.00 14.00 13.00 14.00

L1 3.50 3.93 3.50 3.93

L20 16.40 16.40

L30 28.90 28.90

∅P 3.75 3.85 3.75 3.85

Q 2.65 2.95 2.65 2.95

Package mechanical data LM117, LM217, LM317

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Note: 1 Max resin gate protrusion: 0.5 mm.

2 Resin gate position is accepted in each of the two positions shown on the drawing, or their

symmetrical.

Figure 14. Drawing dimension TO-220 (type STD-ST Dual Gauge)

0015988/A

LM117, LM217, LM317 Package mechanical data

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Note: In spite of some difference in tolerances, the packages are compatible.

Figure 15. Drawing dimension TO-220 (type STD-ST Single Gauge)

8174627_B

Package mechanical data LM117, LM217, LM317

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Figure 16. Drawing dimension tube for TO-220 Dual Gauge (mm.)

Figure 17. Drawing dimension tube for TO-220 Single Gauge (mm.)

LM117, LM217, LM317 Package mechanical data

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Dim. mm. inch.

Min. Typ. Max. Min. Typ. Max.

A 11.85 0.466

B0.96 1.05 1.10 0.037 0.041 0.043

C 1.70 0.066

D8.7 0.342

E 20.0 0.787

G 10.90.429

N 16.90.665

P 26.2 1.031

R3.88 4.090.152 0.161

U39.5 1.555

V30.10 1.185

TO-3 mechanical data

P003C/C

Package mechanical data LM117, LM217, LM317

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Dim. mm. inch.

Min. Typ Max. Min. Typ. Max.

A 4.40 4.60 0.1730.181

B 2.5 2.7 0.098 0.106

D 2.5 2.75 0.098 0.108

E 0.45 0.70 0.017 0.027

F 0.75 1 0.0300.039

F1 1.15 1.50 0.045 0.059

F2 1.15 1.50 0.045 0.059

G4.95 5.2 0.194 0.204

G1 2.4 2.7 0.094 0.106

H 10.0 10.40 0.393 0.409

L2 16 0.630

L328.6 30.6 1.126 1.204

L4 9.810.6 0.3850.417

L5 2.93.6 0.114 0.142

L6 15.916.4 0.626 0.645

L7 99.30.354 0.366

DIA. 33.2 0.1180.126

TO-220FP mechanical data

7012510A-

LM117, LM217, LM317 Package mechanical data

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Figure 18. Drawing dimension D²PAK (type STD-ST)

0079457/L

Package mechanical data LM117, LM217, LM317

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Figure 19. Drawing dimension D²PAK (type WOOSEOK-SUBCON.)

0079457/L