February 2008 Rev 4 1/15
15
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
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.
TO-220TO-3
Table 1. Device summary
Order codes
Temperature range
TO-220 TO-3
LM323T LM323K 0°C to 125°C
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Contents LM323
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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
LM323 Diagram
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1 Diagram
Figure 1. Schematic diagram
Pin configuration LM323
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2 Pin configuration
Figure 2. Pin connections (tot view)
TO-3TO-220
LM323 Maximum ratings
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3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
VIInput voltage 20 V
IOOutput current Internally limited
PDPower dissipation Internally limited
TSTG Storage temperature range -65 to 150 °C
TOP Operating junction temperature range 0 to 125 °C
Table 3. Thermal data
Symbol Parameter TO-220 TO-3 Unit
RthJC Thermal resistance junction-case 3 2 °C/W
RthJA Thermal resistance junction-ambient 50 35 °C/W
Electrical characteristics LM323
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4 Electrical characteristics
Table 4. Electrical characteristics (TJ = 0 to 150 °C, unless otherwise specified (1))
1. Although power dissipation is internally limited, specifications apply only for P ≤ 30 W.
Symbol Parameter Test conditions Min. Typ. Max. Unit
VOOutput voltage rang (2)
2. Selected devices with tightened tolerance output voltage available.
TJ = 25°C, VI = 7.5 V, IO = 0 4.8 5 5.2 V
VOOutput voltage range (2) TJ = Tmin to Tmax, P ≤ Pmax
VI = 7.5 to 15 V, IO = 0 to 3 A 4.75 5.25 V
KVI Line regulation (3)
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 %.
VI = 7.5 to 15 V, TJ = 25°C 5 25 mV
KVO Load regulation (Note 3) IO = 0 to 3 A, VI = 7.5 V, TJ = 25°C 25 100 mV
IIB Quiescent current VI = 7.5 to 15 V, IO = 0 to 3 A 12 20 mA
VNO Output noise voltage TJ = 25°C, f = 10 Hz to 100 kHz 40 µVRMS
IOS Short circuit current limit VI = 15 V, TJ = 25°C 3 4.5 A
VI = 7.5 V, TJ = 25°C 4 5
KVH Long term stability 35 mV
LM323 Typical characteristics
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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
Typical characteristics LM323
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Figure 9. Line transient response Figure 10. Output voltage
Figure 11. Quiescent current Figure 12. Load transient response
LM323 Typical application
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6 Typical application
C1 = Required if regulator is distant from filter capacitors.
CL = Regulator is stable with no load capacitor into resistive loads.
Figure 13. Basic 3 A regulator
Figure 14. Trimming output to 5 V
Typical application LM323
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* Selected for 20 mA current from unregulated negative supply.
** Solid tantalum.
A = LM101A, LM201A, LM301A.
A1 = LM101A, LM201A, LM301A.
CI = 2 µF optional - improves ripple rejection, noise and transient response.
Figure 15. 10 A regulator with complete overload protection
Figure 16. Adjustable regulator 0 - 10 V / 3 A
LM323 Package mechanical data
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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.
Package mechanical data LM323
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Dim. mm. inch.
Min. Typ. Max. Min. Typ. Max.
A 4.40 4.60 0.1730.181
C1.231.32 0.0480.051
D 2.40 2.72 0.094 0.107
D1 1.27 0.050
E0.490.70 0.0190.027
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
G4.95 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
L93.5 3.93 0.137 0.154
DIA. 3.75 3.85 0.147 0.151
TO-220 mechanical data
P011C
LM323 Package mechanical data
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Dim. mm. inch.
Min. Typ. Max. Min. Typ. Max.
A 11.85 0.466
B0.96 1.05 1.10 0.037 0.041 0.043
C 1.70 0.066
D8.7 0.342
E 20.0 0.787
G 10.90.429
N 16.90.665
P 26.2 1.031
R3.88 4.090.152 0.161
U39.5 1.555
V30.10 1.185
TO-3 mechanical data
P003C/C
E
B
R
C
D
A
P
G
N
V
U
O
LM323
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