LM342 National Semiconductor, LM342 Datasheet

LM342

Manufacturer Part Number

LM342

Description

3-Terminal Positive Regulators

Manufacturer

National Semiconductor

Datasheet

1.LM342.pdf (6 pages)

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C 1995 National Semiconductor Corporation

LM342 Series

3-Terminal Positive Regulators

General Description

The LM342-XX series of three-terminal regulators is avail-

able with several fixed output voltages making them useful

in a wide range of applications One of these is local on card

regulation eliminating the distribution problems associated

with single point regulation The voltages available allow

these regulators to be used in logic systems instrumenta-

tion HiFi and other solid state electronic equipment Al-

though designed primarily as fixed voltage regulators these

devices can be used with external components to obtain

adjustable voltages and currents

The LM342-XX series is available in the plastic TO-202

package This package allows these regulators to deliver

over 0 25A if adequate heat sinking is provided Current lim-

iting is included to limit the peak output current to a safe

value Safe area protection for the output transistor is pro-

vided to limit internal power dissipation If internal power

dissipation becomes too high for the heat sinking provided

the thermal shutdown circuit takes over preventing the IC

from overheating

Considerable effort was expended to make the LM342-XX

series of regulators easy to use and minimize the number of

external components It is not necessary to bypass the

Schematic Diagram

TL H 10485

output although this does improve transient response Input

bypassing is needed only if the regulator is located far from

the filter capacitor of the power supply

For output voltage other than 5V 12V and 15V the LM117

series provides an output voltage range from 1 2V to 57V

Features

Voltage Range

LM342-5 0

LM342-12

LM342-15

Output current in excess of 0 25A

Internal thermal overload protection

No external components required

Output transistor safe area protection

Internal short circuit current limit

Available in plastic TO-202 package

Special circuitry allows start-up even if output is pulled

to negative voltage (

12V

15V

supplies)

RRD-B30M115 Printed in U S A

TL H 10485 – 1

June 1989

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