TEXAS INSTRUMENTS LM317 Technical data

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LM317

3-TERMINAL ADJUSTABLE REGULATOR

SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001

D

Output V oltage Range Adjustable From

1.2 V to 37 V

D

Output Current Greater Than 1.5 A

D

Internal Short-Circuit Current Limiting

D

Thermal Overload Protection

D

Output Safe-Area Compensation

D

Package Options Include Plastic
Small-Outline Transistor SOT-223 (DCY),
Flange Mounted (KTE) and Heat-Sink
Mounted (KC) Packages

description

The LM317 is an adjustable three-terminal
positive-voltage regulator capable of supplying
more than 1.5 A over an output-voltage range of

1.2 V to 37 V. It is exceptionally easy to use and
requires only two external resistors to set the
output voltage. Furthermore, both line and load
regulation are better than standard fixed
regulators. The LM317 is packaged in the KC
(TO-220AB) and KTE packages, which are easy
to handle and use.

In addition to having higher performance than
fixed regulators, this device includes on-chip
current limiting, thermal overload protection, and
safe-operating-area protection. All overload
protection remains fully functional, even if the
ADJUST terminal is disconnected.

KC PACKAGE

(TOP VIEW)

INPUT
OUTPUT
ADJUST

The OUTPUT terminal is in electrical
contact with the mounting base.

TO-220AB

I

O

A

KTE PACKAGE

(TOP VIEW)

INPUT
OUTPUT
ADJUST

The OUTPUT terminal is in electrical
contact with the mounting base.

I

O

A

The LM317 is versatile in its applications,
including uses in programmable output regulation
and local on-card regulation. Or, by connecting a
fixed resistor between the ADJUST and OUTPUT
terminals, the LM317 can function as a precision
current regulator. An optional output capacitor can
be added to improve transient response. The
ADJUST terminal can be bypassed to achieve
very high ripple-rejection ratios, which are difficult
to achieve with standard three-terminal
regulators.

The LM317 is characterized for operation over the
virtual junction temperature range of 0°C to
125°C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

DCY PACKAGE

(TOP VIEW)

INPUT

OUTPUT

ADJUST

Copyright  2001, Texas Instruments Incorporated

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

1

LM317
3-TERMINAL ADJUSTABLE REGULATOR

SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001

AVAILABLE OPTIONS

†
‡

schematic diagram

T

J

0°C to 125°C LM317DCY LM317KC LM317KTER
The DCY package also is available taped and reeled, e.g., LM317DCYR.

The KTE package has the same footprint as TO-263 and can be mounted on a TO-263
land pattern. The KTE package is only available taped and reeled.

HEAT-SINK

(DCY)

†

MOUNTED, TO-220

PACKAGED DEVICES

HEAT-SINK

MOUNTED, POWER FLEX

(KC)

PLASTIC FLANGE

‡

(KTE)

INPUT

OUTPUT
ADJUST

absolute maximum ratings over virtual junction temperature range (unless otherwise noted)

Input-to-output differential voltage, V
Package thermal impedance, θ

– VO 40 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I

(see Notes 1 and 2): DCY package 49°C/W. . . . . . . . . . . . . . . . . . . . . . . . .

JA

§

(see Notes 1 and 3): KC package 25°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . .

(see Notes 1 and 2): KTE package 23°C/W. . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

§

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable

ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.

2. The package thermal impedance is calculated in accordance with JESD 51-5.

3. The package thermal impedance is calculated in accordance with JESD 51-7.

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

recommended operating conditions

MIN MAX UNIT

VI – VOInput-to-output voltage differential 3 37 V
I

O

T

J

Output current 1.5 A
Operating virtual junction temperature 0 125 °C

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

LM317

I

(line)

‡

V

V

3 V to 40 V

%/V

ADJ

µ ,

g

I

10 mA to 1500 mA

T

0°C to 125°C

Peak output current

A

Ripple rejection

V

10 V

f

120 HZ

dB

3-TERMINAL ADJUSTABLE REGULATOR

SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001

electrical characteristics over recommended ranges of operating virtual junction temperature
(unless otherwise noted)

PARAMETER

–

nput voltage

Output voltage
(load) regulation

Thermal regulation 20-ms pulse, TJ = 25°C 0.03 0.07 %VO/W
ADJUST terminal current 50 100 µA
Change in

ADJUST terminal current
Reference voltage (V

(OUTPUT to ADJUST)
Output-voltage

temperature stability
Minimum load current

to maintain regulation

p

Output noise voltage (RMS) f = 10 HZ to 10 kHZ, TJ = 25°C 0.003 %V

pp

Long-term stability TJ = 25°C 0.3 1 %/1k Hrs

†

Unless otherwise noted, the following test conditions apply: |VI – VO| = 5 V and I
used to maintain the junction temperature as close to the ambient temperature as possible.

‡

Input regulation is expressed here as the percentage change in output voltage per 1-V change at the input.

§

C

is connected between the ADJUST terminal and GND.

ADJ

NOTE 4: Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient

temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.

regulation

)

ref

=

I

O

=

O

VI – VO = 2.5 V to 40 V, PD ≤ 20 W , IO = 10 mA to 1500 mA 0.2 5 µA

VI – VO = 3 V to 40 V, PD ≤ 20 W , IO = 10 mA to 1500 mA 1.2 1.25 1.3 V

TJ = 0°C to 125°C 0.7 %V

VI – VO = 40 V 3.5 10 mA
VI – VO ≤ 15 V, PD < P

VI – VO ≤ 40 V, PD < P

,

=

O

TEST CONDITIONS

C

= 10 µF§,

TJ = 25°C

=

J

MAX

(see Note 1), TJ = 25°C 0.15 0.4

MAX

=

†

TJ = 25°C 0.01 0.04
TJ = 0°C to 125°C 0.02 0.07
VO ≤ 5 V 25 mV
VO ≥ 5 V 0.1 0.5 %V
VO ≤ 5 V 20 70 mV
VO ≥ 5 V 0.3 1.5 %V

(see Note 1) 1.5 2.2

= 0 µF
= 10 µF

§

§

C

ADJ

C

ADJ

= 1.5 A, TJ = 0°C to 125°C. Pulse testing techniques are

OMAX

MIN TYP MAX UNIT

57

62 64

O

O

O

O

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

LM317
3-TERMINAL ADJUSTABLE REGULATOR

SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001

APPLICATION INFORMATION

V

I

INPUT

LM317

OUTPUT

V

O

ADJUST

V

= 1.25 V

I

Cin (Note A)

0.1 µF

NOTES: A. Cin is not required if the regulator is close enough to the power-supply filter.

V

out

Since I

B. CO improves transient response, but is not needed for stability.

is calculated as:

V

+

V

out

ref

is typically 50 µA, it is negligible in most applications.

Adj

R2

ǒ

1

)

R1

Ǔ

)

(I

R2)

Adj

Adj

ref

R2

Figure 1. Adjustable Voltage Regulator

LM317

+35 V

INPUT

OUTPUT

ADJUST

R1
120 Ω

R1
240 Ω

V

O

CO (Note B)

1.0 µF

V

is calculated as:

out

V

out

Since I

Adj

4

C1

0.1 µF

R2)R3

ǒ

+

V

1

)

ref

is typically 50 µA, it is negligible in most applications.

R1

Ǔ

)

I

(R2)R3) – 10 V

Adj

Figure 2. 0-V to 30-V Regulator Circuit

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

–10 V

R3
680 Ω

R2
3 kΩ

LM317

3-TERMINAL ADJUSTABLE REGULATOR

SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001

APPLICATION INFORMATION

LM317

C3
1 µF

V

O

V

I

INPUT

C1

0.1 µF

OUTPUT

ADJUST

R1
240 Ω

D1
1N4002
(see Note A)

R2
5 kΩ

NOTE A: D1 discharges C2 if the output is shorted to ground.

Figure 3. Adjustable Regulator Circuit With Improved Ripple Rejection

LM317

V

I

OUTPUTINPUT

ADJUST

Figure 4. Precision Current-Limiter Circuit

ADJUST

V

I

INPUT

C1

0.1 µF

OUTPUT

LM317

C2
10 µF

R1
240 Ω

C2
1 µF

R1

INPUT

R2

720 Ω

LM317

OUTPUT

ADJUST

I

limit

Output

Adjust

1.2

+

R1

V

O

R3
120 Ω

R4
1 kΩ

Figure 5. Tracking Preregulator Circuit

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

5

LM317
3-TERMINAL ADJUSTABLE REGULATOR

SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001

APPLICATION INFORMATION

V

Figure 6. 1.2-V to 20-V Regulator Circuit With Minimum Program Current

INPUT

I

LM317

OUTPUT

ADJUST

V

R1

1.2 kΩ

R2
20 kΩ

O

LM317

V

†

Minimum load current from each output is 10 mA. All output voltages are within 200 mV of each other.

INPUT OUTPUT

I

ADJUST

V

R1
120 Ω

†

V

O

I

R2
1 kΩ

LM317

INPUT OUTPUT

ADJUST

†

V

V

O

Figure 7. Adjusting Multiple On-Card Regulators With a Single Control

R

S

LM317

V

INPUT

I

OUTPUT

ADJUST

0.2 Ω

(see Note A)

R1
240 Ω

R2

2.4 kΩ

INPUT OUTPUT

I

LM317

ADJUST

†

V

O

NOTE A: RS controls the output impedance of the charger.

R2

Z

OUT

The use of RS allows for low charging rates with a fully charged battery.

ǒ

+

R

S

Ǔ

1

)

R1

Figure 8. Battery-Charger Circuit

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3-TERMINAL ADJUSTABLE REGULATOR

SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001

APPLICATION INFORMATION

LM317

LM317

V

INPUT

I

OUTPUT

ADJUST

24 Ω

Figure 9. 50-mA Constant-Current Battery-Charger Circuit

LM317

V

INPUT

I

2.7 kΩ

OUTPUT

ADJUST

R2

R1
240 Ω

2N2905

VO = 15 V

D1
1N4002

R3

50 kΩ

C1
25 µF

Figure 10. Slow Turn-On 15-V Regulator Circuit

12 V

I(PP)

LM317

V

V

INPUT

I

INPUT

I

OUTPUT

ADJUST

ADJUST

OUTPUT

LM317

480 Ω

120 Ω

Figure 11. AC Voltage-Regulator Circuit

120 Ω

480 Ω

6 V

O(PP)

2 W (TYP)

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

7

LM317
3-TERMINAL ADJUSTABLE REGULATOR

SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001

APPLICATION INFORMATION

V

I+

NOTE A: R3 sets the peak current (0.6 A for a 1-Ω resistor).

Figure 12. Current-Limited 6-V Charger Circuit

INPUT

V

I–

ADJUST

LM317

OUTPUT

R1
240 Ω

R2

1.1 kΩ

R3
(see Note A)

LM317

V

I

INPUT

INPUT

INPUT

2N2905

OUTPUT

ADJUST

LM317

OUTPUT

ADJUST

LM317

OUTPUT

ADJUST

100 Ω

200 pF

TL080

_

+

0.2 Ω

0.2 Ω

4.5 V to 25 V

0.2 Ω

5 kΩ

5 kΩ

150 Ω

1.5 kΩ

Figure 13. Adjustable 4-A Regulator Circuit

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3-TERMINAL ADJUSTABLE REGULATOR

SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001

APPLICATION INFORMATION

TIP73

LM317

2N2905

V

I

22 Ω

10 µF

NOTES: A. The minimum load current is 30 mA.

B. This optional capacitor improves ripple rejection.

5 kΩ

Figure 14. High-Current Adjustable Regulator Circuit

INPUT

LM317

OUTPUT

ADJUST

120 Ω

10 µF
(see Note B)

500 Ω

1N4002

See
Note A

V

47 µF

O

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

9

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