LM323 Three-terminal 3 A adjustable voltage regulators Features ■ Output current: 3 A ■ Internal current and thermal limiting ■ Typical output impedance: 0.01 W ■ Minimum input voltage: 7.5 V ■ Power dissipation: 30 W Description TO-3 TO-220 The LM323 are three-terminal positive voltage regulators with a preset 5 V output and a load driving capability of 3 A. New circuit design and processing techniques are used to provide the high output current without sacrificing the regulation characteristics of lower current devices. The 3 A regulator is virtually blowout proof. Current limiting, power limiting and thermal shut- down provide the same high level of reliability obtained with these techniques in the LM209, 1 A regulator. An overall worst case specification for the combined effects of input voltage, load current, ambient temperature, and power dissipation ensure that the LM323 will perform satisfactorily as a system element. Table 1. Device summary Order codes Temperature range TO-220 TO-3 LM323T LM323K 0°C to 125°C February 2008 Rev 4 1/15 www.st.com 15

Contents LM323 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2/15

LM323 Diagram 1 Diagram Figure 1. Schematic diagram 3/15

Pin configuration LM323 2 Pin configuration Figure 2. Pin connections (tot view) TO-220 TO-3 4/15

LM323 Maximum ratings 3 Maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value Unit V Input voltage 20 V I I Output current Internally limited O P Power dissipation Internally limited D T Storage temperature range -65 to 150 °C STG T Operating junction temperature range 0 to 125 °C OP Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied Table 3. Thermal data Symbol Parameter TO-220 TO-3 Unit R Thermal resistance junction-case 3 2 °C/W thJC R Thermal resistance junction-ambient 50 35 °C/W thJA 5/15

Electrical characteristics LM323 4 Electrical characteristics Table 4. Electrical characteristics (T = 0 to 150 °C, unless otherwise specified (1)) J Symbol Parameter Test conditions Min. Typ. Max. Unit V Output voltage rang (2) T = 25°C, V = 7.5 V, I = 0 4.8 5 5.2 V O J I O T = T to T , P ≤ P V Output voltage range (2) J min max max 4.75 5.25 V O V = 7.5 to 15 V, I = 0 to 3 A I O K Line regulation (3) V = 7.5 to 15 V, T = 25°C 5 25 mV VI I J K Load regulation (Note 3) I = 0 to 3 A, V = 7.5 V, T = 25°C 25 100 mV VO O I J I Quiescent current V = 7.5 to 15 V, I = 0 to 3 A 12 20 mA IB I O V Output noise voltage T = 25°C, f = 10 Hz to 100 kHz 40 µV NO J RMS V = 15 V, T = 25°C 3 4.5 I J I Short circuit current limit A OS V = 7.5 V, T = 25°C 4 5 I J K Long term stability 35 mV VH 1. Although power dissipation is internally limited, specifications apply only for P ≤ 30 W. 2. Selected devices with tightened tolerance output voltage available. 3. Load and line regulation are specified at constant junction temperature. Pulse testing is required with a pulse width ≤ 1 ms and duty cycle ≤ 5 %. 6/15

LM323 Typical characteristics 5 Typical characteristics Figure 3. Output noise voltage Figure 4. Output impedance Figure 5. Peak available output current Figure 6. Short circuit current Figure 7. Ripple rejection Figure 8. Dropout voltage 7/15

Typical characteristics LM323 Figure 9. Line transient response Figure 10. Output voltage Figure 11. Quiescent current Figure 12. Load transient response 8/15

LM323 Typical application 6 Typical application Figure 13. Basic 3 A regulator C = Required if regulator is distant from filter capacitors. 1 C = Regulator is stable with no load capacitor into resistive loads. L Figure 14. Trimming output to 5 V 9/15

Typical application LM323 Figure 15. 10 A regulator with complete overload protection * Selected for 20 mA current from unregulated negative supply. ** Solid tantalum. A = LM101A, LM201A, LM301A. Figure 16. Adjustable regulator 0 - 10 V / 3 A A1 = LM101A, LM201A, LM301A. C = 2 µF optional - improves ripple rejection, noise and transient response. I 10/15

LM323 Package mechanical data 7 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. 11/15

Package mechanical data LM323 TO-220 mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 4.40 4.60 0.173 0.181 C 1.23 1.32 0.048 0.051 D 2.40 2.72 0.094 0.107 D1 1.27 0.050 E 0.49 0.70 0.019 0.027 F 0.61 0.88 0.024 0.034 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067 G 4.95 5.15 0.194 0.203 G1 2.4 2.7 0.094 0.106 H2 10.0 10.40 0.393 0.409 L2 16.4 0.645 L4 13.0 14.0 0.511 0.551 L5 2.65 2.95 0.104 0.116 L6 15.25 15.75 0.600 0.620 L7 6.2 6.6 0.244 0.260 L9 3.5 3.93 0.137 0.154 DIA. 3.75 3.85 0.147 0.151 P011C 12/15

LM323 Package mechanical data TO-3 mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 11.85 0.466 B 0.96 1.05 1.10 0.037 0.041 0.043 C 1.70 0.066 D 8.7 0.342 E 20.0 0.787 G 10.9 0.429 N 16.9 0.665 P 26.2 1.031 R 3.88 4.09 0.152 0.161 U 39.5 1.555 V 30.10 1.185 A D P G C U E V B N O R P003C/C 13/15

Revision history LM323 8 Revision history Table 5. Document revision history Date Revision Changes 04-Nov-2005 3 Updated curves, no content change. 12-Feb-2008 4 Added: Table1 on page1. 14/15

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