LM7905, LM7912, LM7915
SNOSBQ7C – JUNE 1999 – REVISED MAY 2013
LM79XX Series 3-Terminal Negative Regulators
Check for Samples: LM7905, LM7912, LM7915
•2 Thermal, Short Circuit and Safe Area
• High Ripple Rejection
• 1.5A Output Current
• 4% Tolerance on Preset Output Voltage
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
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
Figure 1. TO-220 Package
See Package Number NDE0003B
*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
†Required for stability. For value given,
capacitor must be solid tantalum. 25μF
aluminum electrolytic may be substituted.
Values given may be increased without
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
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