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LM317D2T

Three-terminal adjustible output positive voltage regulator

Motorola => Freescale 

Order this document by LM317/D

Three-Terminal 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 D2PAK, and Standard 3–Lead Transistor

Package

• Eliminates Stocking many Fixed Voltages

LM317

THREE–TERMINAL

ADJUSTABLE POSITIVE

VOLTAGE REGULATOR

SEMICONDUCTOR

TECHNICAL DATA

T SUFFIX

PLASTIC PACKAGE

CASE 221A

Heatsink surface

connected to Pin 2.

1

2

3

Vin

Cin*

0.1 µF

Standard Application

LM317

IAdj Adjust

Vout

R1

240

+ CO**

1.0 µF

R2

+ ǒ ) Ǔ ) ** Cin is required if regulator is located an appreciable distance from power supply filter.

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

Vout

1.25 V 1

R2

R1

IAdj R2

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

negligible in most applications.

MOTOROLA ANALOG IC DEVICE DATA

Pin 1. Adjust

2. Vout

3. Vin

D2T SUFFIX

PLASTIC PACKAGE

CASE 936

(D2PAK)

12

3

Heatsink surface (shown as terminal 4 in

case outline drawing) is connected to Pin 2.

ORDERING INFORMATION

Device

Operating

Temperature Range

Package

LM317BD2T

Surface Mount

TJ = – 40° to +125°C

LM317BT

Insertion Mount

LM317D2T

LM317T

Surface Mount

TJ = 0° to +125°C Insertion Mount

© Motorola, Inc. 1996

Rev 1

1

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