SNVS757B – MAY 2004 – REVISED NOVEMBER 2004
LM123/LM323A/LM323-N 3-Amp, 5-Volt Positive Regulator
Check for Samples:
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FEATURES
Ensured 1% Initial Accuracy (A Version)
3 Amp Output Current
Internal Current and Thermal Limiting
0.01Ω Typical Output Impedance
7.5V Minimum Input Voltage
30W Power Dissipation
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Product Enhancement tested
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The 3 amp regulator is virtually blowout proof.
Current limiting, 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 capacitor, 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 capacitance.
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 satisfactorily as a system
element.
For applications requiring other voltages, see LM150
series adjustable regulator data sheet.
Operation is specified 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-N. A
hermetic TO-3 package is used for high reliability and
low thermal resistance.
DESCRIPTION
The LM123 is a three-terminal positive regulator with
a preset 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-N. Parameters with tightened
specifications include output voltage tolerance, line
regulation, and load regulation.
Connection Diagram
Metal Can Package
Figure 1. See Package Number NDS
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
Copyright © 2004, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TI [ TEXAS INSTRUMENTS ]
