LM123,LM323,LM323A LM123/LM323A/LM323 3-Amp, 5-Volt Positive Regulator Literature Number: SNVS757B LM123/LM323A/LM323 3-Amp, 5-Volt Positive Regulator General 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. Parameters with tightened specifications include output voltage tolerance, line regulation, and load regulation. 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 F solid tantalum capacitor should be used on the input. A 0.1 F 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 guaranteed over the junction temperature range -55C to +150C for LM123, -40C to +125C for LM323A, and 0C to +125C for LM323. A hermetic TO-3 package is used for high reliability and low thermal resistance. Features n n n n n n n Guaranteed 1% initial accuracy (A version) 3 amp output current Internal current and thermal limiting 0.01 typical output impedance 7.5V minimum input voltage 30W power dissipation P+ Product Enhancement tested Connection Diagram Metal Can Package 00777102 Order Number LM123K STEEL, LM323AK STEEL or LM323K STEEL See NS Package Number K02A Order Number LM123K/883 See NS Package Number K02C (c) 2004 National Semiconductor Corporation DS007771 www.national.com LM123/LM323A/LM323 3-Amp, 5-Volt Positive Regulator May 1998 LM123/LM323A/LM323 Typical Applications Basic 3 Amp Regulator 00777103 *Required if LM123 is more than 4" from filter capacitor. Regulator is stable with no load capacitor into resistive loads. www.national.com 2 LM123 -55C to +150C If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. LM323A -40C to +125C LM323 (Note 5) Input Voltage 20V Power Dissipation 0C to +125C Storage Temperature Range -65C to +150C Lead Temperature (Soldering, 10 sec.) 300C ESD Tolerance (Note 5) 2000V Internally Limited Operating Junction Temperature Range LM123 Electrical Characteristics Parameter Output Voltage (Note 2) Conditions LM123 Units Min Typ Max 4.7 5 5.3 V 5.4 V 5 25 mV 25 100 mV 12 20 mA Tj = 25C VIN = 7.5V, IOUT = 0A 7.5V VIN 15V 4.6 0A IOUT 3A, P 30W Line Regulation (Note 4) Tj = 25C Load Regulation (Note 4) Tj = 25C, VIN = 7.5V, 7.5V VIN 15V 0A IOUT 3A Quiescent Current 7.5V VIN 15V, Output Noise Voltage Tj = 25C 0A IOUT 3A 40 Vrms 10 Hz f 100 kHz Short Circuit Current Limit Tj = 25C VIN = 15V 3 4.5 VIN = 7.5V 4 5 A 35 mV Long Term Stability Thermal Resistance Junction to Case (Note 3) 2 LM323A/LM323 Electrical Characteristics Parameter Output Voltage A C/W (Note 2) Conditions LM323A Tj = 25C LM323 Units Min Typ Max Min Typ Max 4.95 5 5.05 4.8 5 5.2 V 5.15 4.75 5.25 V VIN = 7.5V, IOUT = 0A 7.5V VIN 15V 4.85 0A IOUT 3A, P 30W Line Regulation (Note 4) Tj = 25C 5 10 5 25 mV 25 50 25 100 mV 12 20 12 20 mA 7.5V VIN 15V Load Regulation (Note 4) Tj = 25C, VIN = 7.5V, 0A IOUT 3A Quiescent Current 7.5V VIN 15V, Output Noise Voltage Tj = 25C 0A IOUT 3A 40 40 Vrms 10 Hz f 100 kHz Short Circuit Current Limit Tj = 25C VIN = 15V 3 4.5 3 4.5 VIN = 7.5V 4 6 4 5 A 35 mV Long Term Stability 35 3 A www.national.com LM123/LM323A/LM323 Absolute Maximum Ratings (Note 1) LM123/LM323A/LM323 LM323A/LM323 Electrical Characteristics Parameter (Note 2) (Continued) Conditions LM323A Min Thermal Resistance Junction to Case (Note 3) Typ 2 LM323 Max Min Typ Units Max 2 C/W Note 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 guarantee specific performance limits. Note 2: Unless otherwise noted, specifications apply for -55C Tj +150C for the LM123, -40C Tj +125C for the LM323A, and 0C Tj +125C for the LM323. Although power dissipation is internally limited, specifications apply only for P 30W. Note 3: Without a heat sink, the thermal resistance of the TO-3 package is about 35C/W. With a heat sink, the effective thermal resistance can only approach the specified values of 2C/W, depending on the efficiency of the heat sink. Note 4: 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%. Note 5: Refer to RETS123K drawing for LM123K military specifications. Note 6: Human body model, 1.5 k in series with 100 pF. Typical Performance Characteristics Maximum Average Power Dissipation for LM123 Maximum Average Power Dissipation for LM323A, LM323 00777110 00777109 Output Impedance Peak Available Output Current 00777111 www.national.com 00777112 4 LM123/LM323A/LM323 Typical Performance Characteristics (Continued) Short Circuit Current Ripple Rejection 00777113 00777114 Dropout Voltage Line Transient Response 00777116 00777115 Output Voltage Quiescent Current 00777118 00777117 5 www.national.com LM123/LM323A/LM323 Typical Performance Characteristics (Continued) Load Transient Response Output Noise Voltage 00777120 00777119 Typical Applications 10 Amp Regulator with Complete Overload Protection 00777106 *Select for 20 mA Current from Unregulated Negative Supply www.national.com 6 LM123/LM323A/LM323 Typical Applications (Continued) Adjustable Regulator 0V-10V @ 3A 00777107 A1 -- LM101A C1 -- 2 F Optional -- Improves Ripple Rejection, Noise, and Transient Response Trimming Output to 5V 00777108 7 www.national.com LM123/LM323A/LM323 Typical Applications (Continued) Adjustable Output 5V-10V 0.1% Regulation 00777104 *Select to Set Output Voltage **Select to Draw 25 mA from V- Schematic Diagram 00777101 www.national.com 8 LM123/LM323A/LM323 Physical Dimensions inches (millimeters) unless otherwise noted Metal Can Package (K) Order Number LM123K STEEL, LM323AK STEEL or LM323K STEEL NS Package Number K02A 9 www.national.com LM123/LM323A/LM323 3-Amp, 5-Volt Positive Regulator Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Metal Can Package (K) Mil-Aero Product Order Number LM123K/883 NS Package Number K02C 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. 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