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

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LM123K-STEEL

Manufacturer Part Number
LM123K-STEEL
Description
3-Amp, 5-Volt Positive Regulator
Manufacturer
NSC [National Semiconductor]
Datasheet
© 1999 National Semiconductor Corporation
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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