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LM320L, LM79LXXAC Series 3-Terminal Negative Regulators
February 1995
LM320L, LM79LXXAC Series
3-Terminal Negative Regulators
General Description
The LM320L/LM79LXXAC series of 3-terminal negative
voltage regulators features fixed output voltages of b 5V,
b 12V, and b 15V with output current capabilities in excess
of 100 mA. These devices were designed using the latest
computer techniques for optimizing the packaged IC ther-
mal/electrical performance. The LM79LXXAC series, even
when combined with a minimum output compensation ca-
pacitor of 0.1 m F, exhibits an excellent transient response, a
maximum line regulation of 0.07% V O /V, and a maximum
load regulation of 0.01% V O /mA.
The LM320L/LM79LXXAC series also includes, as self-pro-
tection circuitry: safe operating area circuitry for output tran-
sistor power dissipation limiting, a temperature independent
short circuit current limit for peak output current limiting, and
a thermal shutdown circuit to prevent excessive junction
temperature. Although designed primarily as fixed voltage
regulators, these devices may be combined with simple ex-
ternal circuitry for boosted and/or adjustable voltages and
currents. The LM79LXXAC series is available in the 3-lead
TO-92 package, and SO-8; 8 lead package. The LM320L
series is available in the 3-lead TO-92 package.
For output voltage other than b 5V, b 12V and b 15V the
LM137L series provides an output voltage range from 1.2V
to 47V.
Features
Y Preset output voltage error is less than g 5% overload,
line and temperature
Y Specified at an output current of 100 mA
Y Easily compensated with a small 0.1 m F output
capacitor
Y Internal short-circuit, thermal and safe operating area
protection
Y Easily adjustable to higher output voltages
Y Maximum line regulation less than 0.07% V OUT /V
Y Maximum load regulation less than 0.01% V OUT /mA
Typical Applications
Connection Diagrams
Fixed Output Regulator
SO-8 Plastic (Narrow Body)
TL/H/7748±4
TL/H/7748±1
*Required if the regulator is located far from the power supply filter. A 1 m F
aluminum electrolytic may be substituted.
**Required for stability. A 1 m F aluminum electrolytic may be substituted.
Top View
Order Number LM79L05ACM,
LM79L12ACM or LM79L15ACM
See NS Package Number M08A
Adjustable Output Regulator
TO-92 Plastic Package (Z)
TL/H/7748±2
TL/H/7748±3
Bottom View
Order Number LM320LZ-5.0, LM79L05ACZ,
LM320LZ-12, LM79L12ACZ, LM320LZ-15 or
LM79L15ACZ
See NS Package Number Z03A
b V O eb 5V b (5V/R1 a I Q ) # R2,
5V/R1 l 3I Q
C 1995 National Semiconductor Corporation
TL/H/7748
RRD-B30M115/Printed in U. S. A.
610383265.004.png 610383265.005.png 610383265.006.png
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Input Voltage
V O eb 5V, b 12V, b 15V
Operating Temperature Range
0 § Cto a 70 § C
Maximum Junction Temperature
a 125 § C
Storage Temperature Range
b 55 § Cto a 150 § C
b 35V
Lead Temperature (Soldering, 10 sec.)
260 § C
Internal Power Dissipation (Note 1)
Internally Limited
Electrical Characteristics (Note 2) T A e 0 § Cto a 70 § C unless otherwise noted.
Output Voltage
b 5V
b 12V
b 15V
Input Voltage (unless otherwise noted)
b 10V
b 17V
b 20V
Units
Symbol Parameter Conditions Min Typ Max Min Typ Max Min Typ Max
V O Output Voltage Tj e 25 § C, I O e 100 mA b 5.2 b 5 b 4.8 b 12.5 b 12 b 11.5 b 15.6 b 15 b 14.4
1mA s I O s 100 mA b 5.25 b 4.75 b 12.6 b 11.4 b 15.75 b 14.25
V MIN s V IN s V MAX ( b 20 s V IN s b 7.5) ( b 27 s V IN s b 14.8) ( b 30 s V IN s b 18) V
1mA s I O s 40 mA b 5.25 b 4.75 b 12.6 b 11.4 b 15.75 b 14.25
V MIN s V IN s V MAX ( b 20 s V IN s b 7) ( b 27 s V IN s b 14.5) ( b 30 s V IN s b 17.5)
D V O Line Regulation Tj e 25 § C, I O e 100 mA 60 45 45 mV
V MIN s V IN s V MAX ( b 20 s V IN s b 7.3) ( b 27 s V IN s b 14.6) ( b 30 s V IN s b 17.7) V
Tj e 25 § C, I O e 40 mA 60 45 45 mV
V MIN s V IN s V MAX ( b 20 s V IN s b 7) ( b 27 s V IN s b 14.5) ( b 30 s V IN s b 17.5) V
D V O Load Regulation Tj e 25 § C
50
100
125 mV
1mA s I O s 100 mA
D V O Long Term Stability I O e 100 mA
20
48
60
mV/khrs
I Q Quiescent Current
I O e 100 mA
2 6
2
6
2
6 mA
D I Q Quiescent Current 1 mA s I O s 100 mA
0.3
0.3
0.3
Change
1mA s I O s 40 mA
0.1
0.1
0.1
mA
I O e 100 mA 0.25 0.25 0.25 mA
V MIN s V IN s V MAX ( b 20 s V IN s b 7.5) ( b 27 s V IN s b 14.8) ( b 30 s V IN s b 18) V
V n Output Noise Voltage Tj e 25 § C, I O e 100 mA
40
96
120
m V
f e 10 Hz b 10 kHz
D V IN
D V O
Ripple Rejection Tj e 25 § C, I O e 100 mA
50
52
50
dB
f e 120 Hz
Input Voltage
Tj e 25 § C, I O e 100 mA
b 7.3
b 14.6
b 17.7 V
Required to
I O e 40 mA
b 7.0
b 14.5
b 17.5 V
Maintain Line
Regulation
Note 1: Thermal resistance of Z package is 60 § C/W i jc , 232 § C/W i ja at still air, and 88 § C/W at 400 ft/min of air. The M package i ja is 180 § C/W in still air.
The maximum junction temperature shall not exceed 125 § C on electrical parameters.
Note 2: To ensure constant junction temperature, low duty cycle pulse testing is used.
2
610383265.007.png
Typical Performance Characteristics
Maximum Average Power
Short Circuit Output
Dissipation (TO-92)
Peak Output Current
Current
Output Voltage vs.
Temperature (Normalized
Dropout Voltage
Ripple Rejection
to 1V @ 25 § C)
Quiescent Current
Output Impedance
TL/H/7748±5
Typical Applications (Continued)
g 15V, 100 mA Dual Power Supply
TL/H/7748±6
3
610383265.001.png
 
Schematic Diagrams
b 5V
TL/H/7748±9
b 12V and b 15V
TL/H/7748±10
4
610383265.002.png
 
Physical Dimensions inches (millimeters)
S.O. Package (M)
Order Number LM79L05ACM, LM79L12ACM or LM79L15ACM
NS Package Number M08A
5
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