D

N

The

LM317 are adjustable 3-terminal positive-voltage regulators capable of supplying 1.5A over

a differential voltage range of 3V to 40V. They are exceptionally easy to use and require only two

external resistors to set the output voltage. Both input and output regulation is better than

standard fixed regulators.

In addition to higher performance than fixed regulators, these regulators offer full overload

protection available only in integrated circuits. Included on the chip are current limit, thermal

overload protection, and safe-area protection. All overload protection circuit remains fully

functional even if the adjustment terminal is disconnected. Normally, no capacitors are needed

unless the device is situated far from the input filter capacitors in which case an input bypass is

needed. An optional output capacitor can be added to improve transient response.

The primary applications of each of these regulators is that of a programmable output regulator,

but by connecting a fixed resistor between adjustment terminal and the output terminal, each

device can be used as a precision current regulator. Even though the regulator is floating and

sees only the input-to-output differential voltage, use of these devices to regulate output voltages

that would cause the maximum-rated differential voltage to be exceeded if the output became

shorted is not recommended

FEATURES

Change

Range of Regulator

ABSOLUTE MAXIMUM RATINGS

Input-Output Voltage Differential V

40V

Operating Junction Temperature Range

0℃

℃

℃

℃ to +125℃

℃

℃

℃

Continuous total dissipation at 25℃

℃

℃

℃ free-air temperature

2000mW

Continuous total dissipation at (or below ) 25℃

℃

℃

℃ case temperature

15W

Storage Temperature

–65℃

℃

℃

℃ to +150℃

℃

℃

℃

Lead Temperature1.6 mm from case for 10 seconds

260℃

℃

℃

℃

RECOMMENDED OPERATING CONDITIONS

MIN

MAX

UNIT

OUTPUT CURRENT, I

O

10

1500

mA

OPERATING VIRTUAL JUNCTION TEMPERATURE,T

J

0

70

℃

Wing Shing Computer Components Co., (H.K.)Ltd.

Tel:(852)2341 9276

Fax:(852)2797 8153

E-mail:

wsccltd@hkstar.com

3-TERMINAL ADJUSTABLE REGULATORS

TO-220 PACKAGE

INPUT

OUTPUT

ADJUSTMENT

A

D

I

LM317

LM317T

A

O

I

TO-92

LM317LZ

INPUT

OUTPUT

ADJ