ST LM323 User Manual
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
LM323
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.
TO-220TO-3
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
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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
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LM323 Diagram
1 Diagram
Figure 1. Schematic diagram
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Pin configuration LM323
2 Pin configuration
Figure 2. Pin connections (tot view)
TO-3TO-220
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LM323 Maximum ratings
3 Maximum ratings
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
T
P
T
V
I
STG
OP
Input voltage 20 V
I
Output current Internally limited
O
Power dissipation Internally limited
D
Storage temperature range -65 to 150 °C
Operating junction temperature range 0 to 125 °C
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
R
thJC
thJA
Thermal resistance junction-case 3 2 °C/W
Thermal resistance junction-ambient 50 35 °C/W
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