LM7905, LM7912, LM7915
www.ti.com
SNOSBQ7C – JUNE 1999 – REVISED MAY 2013
LM79XX Series 3-Terminal Negative Regulators
Check for Samples: LM7905, LM7912, LM7915
FEATURES
1
•2 Thermal, Short Circuit and Safe Area
Protection
• High Ripple Rejection
• 1.5A Output Current
• 4% Tolerance on Preset Output Voltage
space
Connection Diagram
DESCRIPTION
The LM79XX series of 3-terminal regulators is
available with fixed output voltages of −5V, −12V, and
−15V. These devices need only one external
component—a compensation capacitor at the output.
The LM79XX series is packaged in the TO-220 power
package and is capable of supplying 1.5A of output
current.
These regulators employ internal current limiting safe
area protection and thermal shutdown for protection
against virtually all overload conditions.
Low ground pin current of the LM79XX series allows
output voltage to be easily boosted above the preset
value with a resistor divider. The low quiescent
current drain of these devices with a specified
maximum change with line and load ensures good
regulation in the voltage boosted mode.
For applications requiring other voltages, see LM137
datasheet.
Figure 1. TO-220 Package
Front View
See Package Number NDE0003B
Typical Applications
*Required if regulator is separated from
filter capacitor by more than 3″. For value
given, capacitor must be solid tantalum.
25μF aluminum electrolytic may be
substituted.
†Required for stability. For value given,
capacitor must be solid tantalum. 25μF
aluminum electrolytic may be substituted.
Values given may be increased without
limit.
For output capacitance in excess of 100μF,
a high current diode from input to output
(1N4001, etc.) will protect the regulator
from momentary input shorts.
Figure 2. Fixed Regulator
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1999–2013, Texas Instruments Incorporated
