LM123, LM323-N, LM323A
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SNVS757B – MAY 2004 – REVISED NOVEMBER 2004
LM123/LM323A/LM323-N 3-Amp, 5-Volt Positive Regulator
Check for Samples: LM123, LM323-N, LM323A
FEATURES
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.
1
•
•
•
•
•
•
•
2
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
P+ Product Enhancement tested
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.
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.
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.
Connection Diagram
Metal Can Package
Figure 1. See Package Number NDS
1
2
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.
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.
Copyright © 2004, Texas Instruments Incorporated
LM123, LM323-N, LM323A
SNVS757B – MAY 2004 – REVISED NOVEMBER 2004
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Typical Applications
*Required if LM123 is more than 4″ from filter capacitor.
†Regulator is stable with no load capacitor into resistive loads.
Figure 2. Basic 3 Amp Regulator
2
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SNVS757B – MAY 2004 – REVISED NOVEMBER 2004
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings (1)
(2) (3)
Input Voltage
20V
Power Dissipation
Operating Junction Temperature Range
Internally Limited
LM123
−55°C to +150°C
LM323A
−40°C to +125°C
LM323-N
0°C to +125°C
−65°C to +150°C
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
300°C
ESD Tolerance (4)
2000V
(1)
(2)
(3)
(4)
“Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not ensure specific performance limits.
Refer to RETS123K drawing for LM123K military specifications.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
Human body model, 1.5 kΩ in series with 100 pF.
LM123 Electrical Characteristics (1)
Parameter
Output Voltage
Line Regulation
(2)
Conditions
LM123
Units
Min
Typ
Max
Tj = 25°C
VIN = 7.5V, IOUT = 0A
4.7
5
5.3
V
7.5V ≤ VIN ≤ 15V
0A ≤ IOUT ≤ 3A, P ≤ 30W
4.6
5.4
V
Tj = 25°C
7.5V ≤ VIN ≤ 15V
5
25
mV
Tj = 25°C, VIN = 7.5V,
0A ≤ IOUT ≤ 3A
25
100
mV
Quiescent Current
7.5V ≤ VIN ≤ 15V,
0A ≤ IOUT ≤ 3A
12
20
mA
Output Noise Voltage
Tj = 25°C
10 Hz ≤ f ≤ 100 kHz
40
Short Circuit Current Limit
Tj = 25°C
Load Regulation
(2)
VIN = 15V
3
VIN = 7.5V
4
Long Term Stability
Thermal Resistance Junction to Case (3)
(1)
(2)
(3)
2
μVrms
4.5
A
5
A
35
mV
°C/W
Unless otherwise noted, specifications apply for −55°C ≤ Tj ≤ +150°C for the LM123, −40°C ≤ Tj ≤ +125°C for the LM323A, and 0°C ≤ Tj
≤ +125°C for the LM323-N. Although power dissipation is internally limited, specifications apply only for P ≤ 30W.
Load and line regulation are specified at constant junction temperature. Pulse testing is required with a pulse width ≤ 1 ms and a duty
cycle ≤ 5%.
Without a heat sink, the thermal resistance of the TO-3 package is about 35°C/W. With a heat sink, the effective thermal resistance can
only approach the specified values of 2°C/W, depending on the efficiency of the heat sink.
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3
LM123, LM323-N, LM323A
SNVS757B – MAY 2004 – REVISED NOVEMBER 2004
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LM323A/LM323-N Electrical Characteristics
Parameter
Output Voltage
Line Regulation
(2)
(1)
Conditions
LM323A
LM323-N
Units
Min
Typ
Max
Min
Typ
Max
Tj = 25°C
VIN = 7.5V, IOUT = 0A
4.95
5
5.05
4.8
5
5.2
V
7.5V ≤ VIN ≤ 15V
0A ≤ IOUT ≤ 3A, P ≤ 30W
4.85
5.15
4.75
5.25
V
Tj = 25°C
7.5V ≤ VIN ≤ 15V
5
10
5
25
mV
Load Regulation (2)
Tj = 25°C, VIN = 7.5V,
0A ≤ IOUT ≤ 3A
25
50
25
100
mV
Quiescent Current
7.5V ≤ VIN ≤ 15V,
0A ≤ IOUT ≤ 3A
12
20
12
20
mA
Output Noise Voltage
Tj = 25°C
10 Hz ≤ f ≤ 100 kHz
40
Short Circuit Current Limit
Tj = 25°C
VIN = 15V
3
VIN = 7.5V
4
Long Term Stability
Thermal Resistance Junction to
Case (3)
(1)
(2)
(3)
4
μVrms
40
4.5
3
6
4
35
2
2
4.5
A
5
A
35
mV
°C/W
Unless otherwise noted, specifications apply for −55°C ≤ Tj ≤ +150°C for the LM123, −40°C ≤ Tj ≤ +125°C for the LM323A, and 0°C ≤ Tj
≤ +125°C for the LM323-N. Although power dissipation is internally limited, specifications apply only for P ≤ 30W.
Load and line regulation are specified at constant junction temperature. Pulse testing is required with a pulse width ≤ 1 ms and a duty
cycle ≤ 5%.
Without a heat sink, the thermal resistance of the TO-3 package is about 35°C/W. With a heat sink, the effective thermal resistance can
only approach the specified values of 2°C/W, depending on the efficiency of the heat sink.
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SNVS757B – MAY 2004 – REVISED NOVEMBER 2004
Typical Performance Characteristics
Maximum Average Power
Dissipation for LM123
Maximum Average Power
Dissipation for LM323A, LM323-N
Figure 3.
Figure 4.
Output Impedance
Peak Available Output Current
Figure 5.
Figure 6.
Short Circuit Current
Ripple Rejection
Figure 7.
Figure 8.
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5
LM123, LM323-N, LM323A
SNVS757B – MAY 2004 – REVISED NOVEMBER 2004
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Typical Performance Characteristics (continued)
6
Dropout Voltage
Line Transient Response
Figure 9.
Figure 10.
Output Voltage
Quiescent Current
Figure 11.
Figure 12.
Load Transient Response
Output Noise Voltage
Figure 13.
Figure 14.
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SNVS757B – MAY 2004 – REVISED NOVEMBER 2004
TYPICAL APPLICATIONS
*Select for 20 mA Current from Unregulated Negative Supply
Figure 15. 10 Amp Regulator with Complete Overload Protection
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LM123, LM323-N, LM323A
SNVS757B – MAY 2004 – REVISED NOVEMBER 2004
www.ti.com
A1—LM101A
C1—2 μF Optional—Improves Ripple Rejection, Noise, and Transient Response
Figure 16. Adjustable Regulator 0V−10V @ 3A
Figure 17. Trimming Output to 5V
*Select to Set Output Voltage
**Select to Draw 25 mA from V−
Figure 18. Adjustable Output 5V−10V 0.1% Regulation
8
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Product Folder Links: LM123 LM323-N LM323A
LM123, LM323-N, LM323A
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SNVS757B – MAY 2004 – REVISED NOVEMBER 2004
Schematic Diagram
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Product Folder Links: LM123 LM323-N LM323A
9
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
LM323K STEEL
ACTIVE
TO-3
NDS
2
50
Non-RoHS &
Non-Green
Call TI
Call TI
0 to 125
LM323K
STEEL
LM323K STEEL/NOPB
ACTIVE
TO-3
NDS
2
50
RoHS & Green
Call TI
Level-1-NA-UNLIM
0 to 125
LM323K
STEEL
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of