Datasheet

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LM123, LM323-N, LM323A

www.ti.com

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.

FEATURES

Current limiting, power limiting, and thermal shutdown

• 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

• 0.01Ω Typical 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

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.

2All 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.

Summary of content (12 pages)

PAGE 1
LM123, LM323-N, LM323A www.ti.com 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.
PAGE 2
LM123, LM323-N, LM323A SNVS757B – MAY 2004 – REVISED NOVEMBER 2004 www.ti.com Typical Applications *Required if LM123 is more than 4″ from filter capacitor. †Regulator is stable with no load capacitor into resistive loads. Figure 2.
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LM123, LM323-N, LM323A www.ti.com 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.
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LM123, LM323-N, LM323A SNVS757B – MAY 2004 – REVISED NOVEMBER 2004 www.ti.com 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.
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LM123, LM323-N, LM323A www.ti.com 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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LM123, LM323-N, LM323A SNVS757B – MAY 2004 – REVISED NOVEMBER 2004 www.ti.com 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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LM123, LM323-N, LM323A www.ti.com SNVS757B – MAY 2004 – REVISED NOVEMBER 2004 TYPICAL APPLICATIONS *Select for 20 mA Current from Unregulated Negative Supply Figure 15.
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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.
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LM123, LM323-N, LM323A www.ti.
PAGE 10
PACKAGE OPTION ADDENDUM www.ti.
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MECHANICAL DATA NDS0002A www.ti.
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