LM317 datasheet(1/12 Pages) ONSEMI

部件名	LM317

功能描述	1.5 A Adjustable Output, Positive Voltage Regulator

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制造商	ONSEMI [ON Semiconductor]

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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 D2PAK, and Standard 3–Lead Transistor

Package

• Eliminates Stocking many Fixed Voltages

Standard Application

**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.

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

negligible in most applications.

Vout + 1.25V 1 )

R2

R1

) IAdj R2

LM317

Vin

Vout

R1

240

R2

Adjust

IAdj

Cin*

0.1 µF

+ CO**

1.0 µF

ON Semiconductort

January, 2002 – Rev. 3

1

Publication Order Number:

LM317/D

SEMICONDUCTOR

TECHNICAL DATA

THREE–TERMINAL

ADJUSTABLE POSITIVE

VOLTAGE REGULATOR

Device

Operating

Temperature Range

Package

T SUFFIX

PLASTIC PACKAGE

CASE 221A

ORDERING INFORMATION

LM317BT

LM317BD2T

Insertion Mount

Surface Mount

LM317T

LM317D2T

TJ = 0° to +125°C

Insertion Mount

Surface Mount

TJ = –40° to +125°C

Pin 1. Adjust

2. Vout

3. Vin

D2T SUFFIX

PLASTIC PACKAGE

CASE 936

(D2PAK)

Heatsink surface (shown as terminal 4 in

case outline drawing) is connected to Pin 2.

3

1

2

Heatsink surface

connected to Pin 2.

LM317

3

1

2

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