ON Semiconductor LM317 Technical data

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ON Semiconductor

1.5 A Adjustable Output,
Positive Voltage Regulator

The LM317 is an adjustable 3–terminal positive voltage regulator

capable of supplying in excess of 1.5 A over an output voltage range of

1.2 V to 37 V. This voltage regulator is exceptionally easy to use and
requires only two external resistors to set the output voltage. Further, it
employs internal current limiting, thermal shutdown and safe area
compensation, making it essentially blow–out proof.

The LM317 serves a wide variety of applications including local, on
card regulation. This device can also be used to make a programmable
output regulator, or by connecting a fixed resistor between the
adjustment and output, the LM317 can be used as a precision current
regulator.

• Output Current in Excess of 1.5 A

• Output Adjustable between 1.2 V and 37 V

• Internal Thermal Overload Protection

• Internal Short Circuit Current Limiting Constant with Temperature

• Output Transistor Safe–Area Compensation

• Floating Operation for High Voltage Applications

• Available in Surface Mount D

Package

• Eliminates Stocking many Fixed Voltages

2

PAK, and Standard 3–Lead Transistor

LM317

THREE–TERMINAL

ADJUSTABLE POSITIVE

VOLTAGE REGULATOR

SEMICONDUCTOR

TECHNICAL DATA

T SUFFIX

PLASTIC PACKAGE

CASE 221A

Heatsink surface

connected to Pin 2.

Pin 1. Adjust

2. V

3. V

1

2

3

out
in

Standard Application

V

in

Cin*

0.1 µF

**Cin is required if regulator is located an appreciable distance from power supply filter.

**C

is not needed for stability, however, it does improve transient response.

O

V

  1.25V

out

is controlled to less than 100 µA, the error associated with this term is

Since I

Adj

negligible in most applications.

I

Adj

LM317



1 

Adjust

R

2

R

R

2

1



 I

Adj

V

out

R

1

240

+

CO**

1.0 µF

R

2

D2T SUFFIX

PLASTIC PACKAGE

CASE 936

(D

Heatsink surface (shown as terminal 4 in

case outline drawing) is connected to Pin 2.

ORDERING INFORMATION

Device

LM317BD2T
LM317BT

LM317D2T
LM317T

2

PAK)

Operating

Temperature Range

= –40° to +125°C

T

J

T

= 0° to +125°C

J

2

1

3

Package

Surface Mount
Insertion Mount

Surface Mount
Insertion Mount

 Semiconductor Components Industries, LLC, 2002

January , 2002 – Rev. 3

1 Publication Order Number:

LM317/D

LM317

MAXIMUM RATINGS

Rating Symbol Value Unit

Input–Output V oltage Differential VI–V
Power Dissipation

Case 221A

TA = +25°C P
Thermal Resistance, Junction–to–Ambient θ
Thermal Resistance, Junction–to–Case θ

Case 936 (D2PAK)

TA = +25°C P
Thermal Resistance, Junction–to–Ambient θ
Thermal Resistance, Junction–to–Case θ

Operating Junction Temperature Range T
Storage Temperature Range T

stg

JA
JC

JA
JC

O

D

40 Vdc

Internally Limited W

65 °C/W

5.0 °C/W

D

Internally Limited W

70 °C/W

5.0 °C/W

J

–40 to +125 °C
–65 to +150 °C

ELECTRICAL CHARACTERISTICS (V

I–VO

= 5.0 V; I

= 0.5 A for D2T and T packages; TJ = T

O

low

to T

high

[Note 1]; I

max

and P

[Note 2]; unless otherwise noted.)

Characteristics

Line Regulation (Note 3), TA = +25°C, 3.0 V ≤ VI–VO ≤ 40 V 1 Reg
Load Regulation (Note 3), TA = +25°C, 10 mA ≤ IO ≤ I

max

VO ≤ 5.0 V
V

≥ 5.0 V

O

Thermal Regulation, TA = +25°C (Note 6), 20 ms Pulse Reg
Adjustment Pin Current 3 I
Adjustment Pin Current Change, 2.5 V ≤ VI–VO ≤ 40 V,

10 mA ≤ I

≤ I

, PD ≤ P

L

max

max

Reference Voltage, 3.0 V ≤VI–VO ≤ 40 V,

10 mA ≤ I

≤ I

, PD ≤ P

O

max

max

Line Regulation (Note 3), 3.0 V ≤ VI–VO ≤ 40 V 1 Reg
Load Regulation (Note 3), 10 mA ≤ IO ≤ I

max

VO ≤ 5.0 V
V

≥ 5.0 V

O

Temperature Stability (T

≤ TJ ≤ T

low

) 3 T

high

Minimum Load Current to Maintain Regulation (VI–VO = 40 V) 3 I
Maximum Output Current

V

≤ 15 V, PD ≤ P

I–VO

= 40 V, PD ≤ P

V

I–VO

T Package

max,

, TA = +25°C, T Package

max

Figure Symbol Min Typ Max Unit

– 0.01 0.04 %/V

–
–

5.0

0.1

25

0.5
– 0.03 0.07 % VO/W
– 50 100 µA
– 0.2 5.0 µA

1.2 1.25 1.3 V

– 0.02 0.07 % V

–
–

20

0.3

70

1.5
– 0.7 – % V
– 3.5 10 mA

1.5

0.15

2.2

0.4

–
–

2 Reg

1, 2 ∆I

3 V

2 Reg

3 I

line

load

therm

Adj

Adj

ref

line

load

S

Lmin

max

RMS Noise, % of VO, TA = +25°C, 10 Hz ≤ f ≤ 10 kHz N – 0.003 – % V
Ripple Rejection, VO = 10 V, f = 120 Hz (Note 4)

Without C
C

Long–Term Stability, TJ = T

= 10 µF

Adj

Adj

(Note 5), TA = +25°C for

high

4 RR

–

66

65
80

–
–

3 S – 0.3 1.0 %/1.0 k

Endpoint Measurements

Thermal Resistance Junction to Case, T Package R

NOTES: 1.T

to T

low

2.I

max

3.Load and line regulation are specified at constant junction temperature. Changes in V
Pulse testing with low duty cycle is used.

4.C

Adj

5.Since Long–Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability
from lot to lot.

6.Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die. These
effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these temperature gradients
on the output voltage and is expressed in percentage of output change per watt of power change in a specified time.

= 0° to +125°C, for LM317T, D2T. T

high

= 1.5 A, P

, when used, is connected between the adjustment pin and ground.

max

= 20 W

low

to T

= –40° to +125°C, for LM317BT, BD2T.

high

θ

JC

due to heating effects must be taken into account separately.

O

– 5.0 – °C/W

mV

% V

mV

% V

dB

Hrs.

max

O

O
O

A

O

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2

125k

j

LM317

Representative Schematic Diagram

V

31

310 230 120

5.6k

0

170

6.7k

12k

160

5.0pF
200

135

12.4k

6.8k

510

in

6.3V

13k

6.3V

6.3V

190

*

*Pulse testing required.

*1% Duty Cycle
*is suggested.

3.6k 5.8k 110 5.1k

V

CC

V
V

C

0.1 µF

in

30
pF

30
pF

2.4k

12.5k

This device contains 29 active transistors.

IH

IL

V

in

LM317

LineRegulation(%V) 

V

out

Adjust

R

I

Adj

105

4.0

0.1

V

out

Adjust

|VOHVOL|

|VOL|

240

1

1%

O

x100

+

1.0 µFC

V

OH

V

OL

R

L

R

2

1%

Figure 1. Line Regulation and ∆I

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3

/Line Test Circuit

Ad

LM317

V

I

C

in

V

0.1 µF

in

Load Regulation (mV) = V

V

I

C

in

LM317

I

Adj

Adjust

R

2

out

R

I

240

1

1%

V

1%

(min Load) - V

O

(max Load)

O

Figure 2. Load Regulation and ∆I

V

in

0.1 µF

LM317

I

Adj

Adjust

L

R

L

(max Load)

*

+

C

1.0 µF

O

R

L

(min Load)

*Pulse testing required.

*1% Duty Cycle is suggested.

(min Load) - V

V

Load Regulation (% VO) = x 100

/Load Test Circuit

Adj

V

out

240

R

1

1%

O

VO (min Load)

I

L

V

ref

(max Load)

O

R

+

1.0 µFC

O

V

(min Load)

O

(max Load)

V

O

L

V

O

24 V

14 V

f = 120 Hz

* Pulse testing required.

* 1% Duty Cycle is suggested.

V

in

C

0.1 µF

in

I

SET

R

2

1%

: V

To Calculate R

To Calculate R2: Assume I

= I

2

out

Figure 3. Standard Test Circuit

V

LM317

R

2

Adjust

1.65 k
1%

out

240

R

1

1%

+

C

10 µF

Adj

SET R2

SET

+ 1.250 V

= 5.25 mA

*

D

1

1N4002

R

+

L

1.0 µF

C

O

V

= 10 V

out

V

O

*D

Discharges C

1

if output is shorted to Ground.

Adj

Figure 4. Ripple Rejection Test Circuit

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