LM320L/LM79LXXAC/LM13121 Series 3-Terminal Negative Regulators
September 2002
LM320L/LM79LXXAC/LM13121 Series
3-Terminal Negative Regulators
General Description
The LM320L/LM79LXXAC/LM13121 dual marked series of
3-terminal negative voltage regulators features fixed output
voltages of 鈭?V, 鈭?2V, and 鈭?5V with output current capa-
bilities in excess of 100mA. These devices were designed
using the latest computer techniques for optimizing the pack-
aged IC thermal/electrical performance. The LM79LXXAC
series, even when combined with a minimum output com-
pensation capacitor of 0.1碌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/LM13121 series also includes, as
self-protection circuitry: safe operating area circuitry for out-
put transistor power dissipation limiting, a temperature inde-
pendent 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 external circuitry for boosted and/or adjustable volt-
ages 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 鈭?V, 鈭?2V and 鈭?5V, the
LM137L series provides an output voltage range from 1.2V
to 47V.
Features
n
Preset output voltage error is less than
鹵
5% overload,
line and temperature
n
Specified at an output current of 100mA
n
Easily compensated with a small 0.1碌F output
capacitor
n
Internal short-circuit, thermal and safe operating area
protection
n
Easily adjustable to higher output voltages
n
Maximum line regulation less than 0.07% V
OUT
/V
n
Maximum load regulation less than 0.01% V
OUT
/mA
Typical Applications
Fixed Output Regulator
Connection Diagrams
SO-8 Plastic (Narrow Body)
00774804
00774801
*Required if the regulator is located far from the power supply filter. A 1碌F
aluminum electrolytic may be substituted.
*
*
Required for stability. A 1碌F aluminum electrolytic may be substituted.
Top View
Order Number LM79L05ACM, LM79L12ACM
LM79L15ACM, LM79L05ACMX,
LM79L12ACMX or LM79L15ACMX
See NS Package Number M08A
TO-92 Plastic Package (Z)
Adjustable Output Regulator
00774802
00774803
鈭扸
0
= 鈭?V 鈭?(5V/R1 + I
Q
)
鈥?/div>
R2,
5V/R1
>
3 I
Q
Bottom View
Order Number LM320LZ-5.0, LM79L05ACZ,
LM320LZ-12, LM79L12ACZ, LM320LZ-15 or
LM79L15ACZ, LM13121Z-12, LM13121Z-15,
LM13121Z-5.0
See NS Package Number Z03A
漏 2002 National Semiconductor Corporation
DS007748
www.national.com
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