LM123K-STEEL NSC [National Semiconductor], LM123K-STEEL Datasheet

LM123K-STEEL

Manufacturer Part Number

LM123K-STEEL

Description

3-Amp, 5-Volt Positive Regulator

Manufacturer

NSC [National Semiconductor]

Datasheet

1.LM123K-STEEL.pdf (8 pages)

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LM123/LM323A/LM323

3-Amp, 5-Volt Positive Regulator

General Description

The LM123 is a three-terminal positive regulator with a pre-

set 5V output and a load driving capability of 3 amps. New

circuit design and processing techniques are used to provide

the high output current without sacrificing the regulation

characteristics of lower current devices.

The LM323A offers improved precision over the standard

LM323. Parameters with tightened specifications include

output voltage tolerance, line regulation, and load regulation.

The 3 amp regulator is virtually blowout proof. Current limit-

ing, power limiting, and thermal shutdown provide the same

high level of reliability obtained with these techniques in the

LM109 1 amp regulator.

No external components are required for operation of the

LM123. If the device is more than 4 inches from the filter ca-

pacitor, however, a 1 µF solid tantalum capacitor should be

used on the input. A 0.1 µF or larger capacitor may be used

on the output to reduce load transient spikes created by fast

switching digital logic, or to swamp out stray load capaci-

tance.

Connection Diagram

Typical Applications

*Required if LM123 is more than 4" from filter capacitor.

†

Regulator is stable with no load capacitor into resistive loads.

Order Number LM123K STEEL, LM323AK STEEL or LM323K STEEL

DS007771

See NS Package Number K02A

See NS Package Number K02C

Order Number LM123K/883

Basic 3 Amp Regulator

Metal Can Package

An overall worst case specification for the combined effects

of input voltage, load currents, ambient temperature, and

power dissipation ensure that the LM123 will perform satis-

factorily as a system element.

For applications requiring other voltages, see LM150 series

adjustable regulator data sheet.

Operation is guaranteed over the junction temperature range

−55˚C to +150˚C for LM123, −40˚C to +125˚C for LM323A,

and 0˚C to +125˚C for LM323. A hermetic TO-3 package is

used for high reliability and low thermal resistance.

Features

n Guaranteed 1% initial accuracy (A version)

n 3 amp output current

n Internal current and thermal limiting

n 0.01

n 7.5V minimum input voltage

n 30W power dissipation

n P

Product Enhancement tested

DS007771-2

typical output impedance

DS007771-3

www.national.com

April 1998

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LM123K-STEEL Summary of contents

Page 1

... Connection Diagram Order Number LM123K STEEL, LM323AK STEEL or LM323K STEEL Typical Applications *Required if LM123 is more than 4" from filter capacitor. † Regulator is stable with no load capacitor into resistive loads. ...

Page 2

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 5) Input Voltage Power Dissipation LM123 Electrical Characteristics Parameter Output Voltage T V 7.5V 0A Line Regulation (Note ...

Page 3

... Note 4: Load and line regulation are specified at constant junction temperature. Pulse testing is required with a pulse width Note 5: Refer to RETS123K drawing for LM123K military specifications. Note 6: Human body model, 1 series with 100 pF. ...

Page 4

Typical Performance Characteristics Quiescent Current DS007771-18 Typical Applications 10 Amp Regulator with Complete Overload Protection *Select for 20 mA Current from Unregulated Negative Supply www.national.com (Continued) Load Transient Response DS007771-19 4 Output Noise Voltage DS007771-20 DS007771-6 ...

Page 5

Typical Applications (Continued) A — LM101A 1 C — 2 µF Optional — Improves Ripple Rejection, Noise, and Transient Response 1 Adjustable Output 5V−10V 0.1% Regulation *Select to Set Output Voltage − Select to Draw 25 mA from ...

Page 6

Schematic Diagram www.national.com 6 DS007771-1 ...

Page 7

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM123K STEEL, LM323AK STEEL or LM323K STEEL Metal Can Package (K) NS Package Number K02A 7 www.national.com ...

Page 8

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. Metal Can Package (K) Mil-Aero Product Order Number LM123K/883 NS Package Number K02C 2. A critical component is any component of a life ...

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