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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
TO-3 TO-220
Description
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 shutdown 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 LM323T TO-3 LM323K Rev 4 0C to 125C 1/15
www.st.com 15
February 2008
Contents
LM323
Contents
1 2 3 4 5 6 7 8 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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LM323
Diagram
1
Figure 1.
Diagram
Schematic diagram
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Pin configuration
LM323
2
Figure 2.
Pin configuration
Pin connections (tot view)
TO-220
TO-3
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LM323
Maximum ratings
3
Table 2.
Symbol VI IO PD TSTG TOP
Maximum ratings
Absolute maximum ratings
Parameter Input voltage Output current Power dissipation Storage temperature range Operating junction temperature range Value 20 Internally limited Internally limited -65 to 150 0 to 125 C C Unit V
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied Thermal data
Parameter Thermal resistance junction-case Thermal resistance junction-ambient TO-220 3 50 TO-3 2 35 Unit C/W C/W
Table 3.
Symbol RthJC RthJA
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Electrical characteristics
LM323
4
Table 4.
Symbol VO VO KVI KVO IIB VNO IOS KVH
Electrical characteristics
Electrical characteristics (TJ = 0 to 150 C, unless otherwise specified (1))
Parameter Output voltage rang (2) Output voltage range (2) Line regulation (3) Load regulation (Note 3) Quiescent current Output noise voltage Short circuit current limit Long term stability Test conditions TJ = 25C, VI = 7.5 V, IO = 0 TJ = Tmin to Tmax, P Pmax VI = 7.5 to 15 V, IO = 0 to 3 A VI = 7.5 to 15 V, TJ = 25C IO = 0 to 3 A, VI = 7.5 V, TJ = 25C VI = 7.5 to 15 V, IO = 0 to 3 A TJ = 25C, f = 10 Hz to 100 kHz VI = 15 V, TJ = 25C VI = 7.5 V, TJ = 25C Min. 4.8 4.75 5 25 12 40 3 4 4.5 A 5 35 mV Typ. 5 Max. 5.2 5.25 25 100 20 Unit V V mV mV mA VRMS
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 %.
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LM323
Typical characteristics
5
Figure 3.
Typical characteristics
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
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Typical characteristics
LM323
Figure 9.
Line transient response
Figure 10. Output voltage
Figure 11. Quiescent current
Figure 12. Load transient response
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LM323
Typical application
6
Typical application
Figure 13. Basic 3 A regulator
C1 = Required if regulator is distant from filter capacitors. CL = Regulator is stable with no load capacitor into resistive loads.
Figure 14. Trimming output to 5 V
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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. CI = 2 F optional - improves ripple rejection, noise and transient response.
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LM323
Package mechanical data
7
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) 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.
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Package mechanical data
LM323
TO-220 mechanical data
Dim. A C D D1 E F F1 F2 G G1 H2 L2 L4 L5 L6 L7 L9 DIA. 13.0 2.65 15.25 6.2 3.5 3.75 0.49 0.61 1.14 1.14 4.95 2.4 10.0 16.4 14.0 2.95 15.75 6.6 3.93 3.85 0.511 0.104 0.600 0.244 0.137 0.147 mm. Min. 4.40 1.23 2.40 1.27 0.70 0.88 1.70 1.70 5.15 2.7 10.40 0.019 0.024 0.044 0.044 0.194 0.094 0.393 0.645 0.551 0.116 0.620 0.260 0.154 0.151 Typ. Max. 4.60 1.32 2.72 Min. 0.173 0.048 0.094 0.050 0.027 0.034 0.067 0.067 0.203 0.106 0.409 inch. Typ. Max. 0.181 0.051 0.107
P011C
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LM323
Package mechanical data
TO-3 mechanical data
Dim. A B C D E G N P R U V 30.10 3.88 10.9 16.9 26.2 4.09 39.5 1.185 0.152 0.96 mm. Min. Typ. 11.85 1.05 1.10 1.70 8.7 20.0 0.429 0.665 1.031 0.161 1.555 0.037 Max. Min. inch. Typ. 0.466 0.041 0.043 0.066 0.342 0.787 Max.
P G
A
D C
U
V
O
N
R
P003C/C
B
E
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Revision history
LM323
8
Table 5.
Date
Revision history
Document revision history
Revision 3 4 Changes Updated curves, no content change. Added: Table 1 on page 1.
04-Nov-2005 12-Feb-2008
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LM323
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