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
mF
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
Y
Y
Y
Y
Y
Y
Preset output voltage error is less than
g
5% overload
line and temperature
Specified at an output current of 100 mA
Easily compensated with a small 0 1
mF
output
capacitor
Internal short-circuit thermal and safe operating area
protection
Easily adjustable to higher output voltages
Maximum line regulation less than 0 07% V
OUT
V
Maximum load regulation less than 0 01% V
OUT
mA
Typical Applications
Fixed Output Regulator
Connection Diagrams
SO-8 Plastic (Narrow Body)
TL H 7748 鈥?4
TL H 7748 鈥?1
Top View
Order Number LM79L05ACM
LM79L12ACM or LM79L15ACM
See NS Package Number M08A
Required if the regulator is located far from the power supply filter A 1
mF
aluminum electrolytic may be substituted
Required for stability A 1
mF
aluminum electrolytic may be substituted
Adjustable Output Regulator
TO-92 Plastic Package (Z)
TL H 7748 鈥?2
Bottom View
TL H 7748 鈥?3
b
V
O
e b
5V
b
(5V R1
a
I
Q
)
R2
5V R1
l
3 I
Q
Order Number LM320LZ-5 0 LM79L05ACZ
LM320LZ-12 LM79L12ACZ LM320LZ-15 or
LM79L15ACZ
See NS Package Number Z03A
C
1995 National Semiconductor Corporation
TL H 7748
RRD-B30M115 Printed in U S A
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