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
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
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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
4/15
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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Electrical characteristics LM323
4 Electrical characteristics
Table 4. Electrical characteristics (TJ = 0 to 150 °C, unless otherwise specified
(1)
)
Symbol Parameter Test conditions Min. Typ. Max. Unit
(3)
(2)
TJ = 25°C, VI = 7.5 V, IO = 0 4.8 5 5.2 V
TJ = T
(2)
VI = 7.5 to 15 V, IO = 0 to 3 A
min
to T
max
, P ≤ P
max
4.75 5.25 V
VI = 7.5 to 15 V, TJ = 25°C 5 25 mV
V
= 15 V, TJ = 25°C 3 4.5
I
= 7.5 V, TJ = 25°C 4 5
V
I
V
Output voltage rang
O
V
Output voltage range
O
Line regulation
K
VI
K
V
K
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
Load regulation (Note 3) IO = 0 to 3 A, VI = 7.5 V, TJ = 25°C 25 100 mV
VO
I
Quiescent current VI = 7.5 to 15 V, IO = 0 to 3 A 12 20 mA
IB
Output noise voltage TJ = 25°C, f = 10 Hz to 100 kHz 40 µV
NO
I
Short circuit current limit
OS
Long term stability 35 mV
VH
and duty cycle ≤ 5 %.
RMS
A
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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
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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.
= Regulator is stable with no load capacitor into resistive loads.
C
L
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
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A1 = LM101A, LM201A, LM301A.
= 2 µF optional - improves ripple rejection, noise and transient response.
C
I
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.
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Package mechanical data LM323
TO-220 mechanical data
Dim.
A 4.40 4.60 0.173 0.181
C1.23 1.32 0.048 0.051
D 2.40 2.72 0.094 0.107
D1 1.27 0.050
E0.49 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
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
Min. Typ. Max. Min. Typ. Max.
mm. inch.
12/15
P011C
LM323 Package mechanical data
TO-3 mechanical data
Dim.
A 11.85 0.466
B0.96 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
Min. Typ. Max. Min. Typ. Max.
mm. inch.
P
A
G
U
V
N
O
B
D
C
E
R
P003C/C
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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: Table 1 on page 1.
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LM323
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