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
The 3 amp regulator is virtually blowout proof.
1FEATURES Current limiting, power limiting, and thermal shutdown
2• Ensured 1% Initial Accuracy (A Version) provide the same high level of reliability obtained with
• 3 Amp Output Current these techniques in the LM109 1 amp regulator.
• Internal Current and Thermal Limiting No external components are required for operation of
• 0.01ΩTypical Output Impedance the LM123. If the device is more than 4 inches from
the filter capacitor, however, a 1 μF solid tantalum
• 7.5V Minimum Input Voltage capacitor should be used on the input. A 0.1 μF or
• 30W Power Dissipation larger capacitor may be used on the output to reduce
• P+Product Enhancement tested load transient spikes created by fast switching digital
logic, or to swamp out stray load capacitance.
DESCRIPTION An overall worst case specification for the combined
The LM123 is a three-terminal positive regulator with effects of input voltage, load currents, ambient
a preset 5V output and a load driving capability of 3 temperature, and power dissipation ensure that the
amps. New circuit design and processing techniques LM123 will perform satisfactorily as a system
are used to provide the high output current without element.
sacrificing the regulation characteristics of lower For applications requiring other voltages, see LM150
current devices. series adjustable regulator data sheet.
The LM323A offers improved precision over the Operation is specified over the junction temperature
standard LM323-N. Parameters with tightened range −55°C to +150°C for LM123, −40°C to +125°C
specifications include output voltage tolerance, line for LM323A, and 0°C to +125°C for LM323-N. A
regulation, and load regulation. hermetic TO-3 package is used for high reliability and
low thermal resistance.
Connection Diagram
Metal Can Package
Figure 1. See Package Number NDS
1Please 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.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Copyright © 2004, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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
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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 Internally Limited
Operating Junction Temperature Range LM123 −55°C to +150°C
LM323A −40°C to +125°C
LM323-N 0°C to +125°C
Storage Temperature Range −65°C to +150°C
Lead Temperature (Soldering, 10 sec.) 300°C
ESD Tolerance(4) 2000V
(1) “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.
(2) Refer to RETS123K drawing for LM123K military specifications.
(3) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(4) Human body model, 1.5 kΩin series with 100 pF.
LM123 Electrical Characteristics(1)
Parameter Conditions LM123 Units
Min Typ Max
Output Voltage Tj= 25°C 4.7 5 5.3 V
VIN = 7.5V, IOUT = 0A
7.5V ≤VIN ≤15V 4.6 5.4 V
0A ≤IOUT ≤3A, P ≤30W
Line Regulation (2) Tj= 25°C 5 25 mV
7.5V ≤VIN ≤15V
Load Regulation (2) Tj= 25°C, VIN = 7.5V, 25 100 mV
0A ≤IOUT ≤3A
Quiescent Current 7.5V ≤VIN ≤15V, 12 20 mA
0A ≤IOUT ≤3A
Output Noise Voltage Tj= 25°C 40 μVrms
10 Hz ≤f≤100 kHz
Short Circuit Current Limit Tj= 25°C VIN = 15V 3 4.5 A
VIN = 7.5V 4 5 A
Long Term Stability 35 mV
Thermal Resistance Junction to Case(3) 2 °C/W
(1) 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.
(2) 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%.
(3) 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
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LM323A/LM323-N Electrical Characteristics (1)
Parameter Conditions LM323A LM323-N Units
Min Typ Max Min Typ Max
Output Voltage Tj= 25°C 4.95 5 5.05 4.8 5 5.2 V
VIN = 7.5V, IOUT = 0A
7.5V ≤VIN ≤15V 4.85 5.15 4.75 5.25 V
0A ≤IOUT ≤3A, P ≤30W
Line Regulation(2) Tj= 25°C 5 10 5 25 mV
7.5V ≤VIN ≤15V
Load Regulation(2) Tj= 25°C, VIN = 7.5V, 25 50 25 100 mV
0A ≤IOUT ≤3A
Quiescent Current 7.5V ≤VIN ≤15V, 12 20 12 20 mA
0A ≤IOUT ≤3A
Output Noise Voltage Tj= 25°C 40 40 μVrms
10 Hz ≤f≤100 kHz
Short Circuit Current Limit Tj= 25°C VIN = 15V 3 4.5 3 4.5 A
VIN = 7.5V 4 6 4 5 A
Long Term Stability 35 35 mV
Thermal Resistance Junction to 2 2 °C/W
Case (3)
(1) 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.
(2) 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%.
(3) 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 Maximum Average Power
Dissipation for LM123 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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SNVS757B –MAY 2004–REVISED NOVEMBER 2004
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Typical Performance Characteristics (continued)
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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Product Folder Links: LM123 LM323-N LM323A
LM123, LM323-N, LM323A
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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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Product Folder Links: LM123 LM323-N LM323A
LM123, LM323-N, LM323A
SNVS757B –MAY 2004–REVISED NOVEMBER 2004
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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
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Product Folder Links: LM123 LM323-N LM323A
PACKAGE OPTION ADDENDUM
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Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead finish/
Ball material
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
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 <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
PACKAGE OPTION ADDENDUM
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Addendum-Page 2
MECHANICAL DATA
NDS0002A
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