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LM341, LM78M05

SNVS090F – MAY 2004 – REVISED DECEMBER 2016

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7.3 Feature Description

The LM341 and LM78M05 fixed voltage regulators have built-in thermal overload protection which prevents the

device from being damaged due to excessive junction temperature.

The regulators also contain internal short-circuit protection which limits the maximum output current, and safe-

area protection for the pass transistor which reduces the short-circuit current as the voltage across the pass

transistor is increased.

Although the internal power dissipation is automatically limited, the maximum junction temperature of the device

must be kept below 125°C to meet data sheet specifications. An adequate heat sink must be provided to assure

this limit is not exceeded under worst-case operating conditions (maximum input voltage and load current) if

reliable performance is to be obtained.

7.4 Device Functional Modes

7.4.1 Normal Operation

The device OUTPUT pin sources current necessary to make the voltage at the OUTPUT pin equal to the fixed

voltage level of the device.

7.4.2 Operation With Low Input Voltage

drop out of regulation in which the OUTPUT voltage would equal INPUT voltage minus dropout voltage.

7.4.3 Operation in Self Protection

When an overload occurs, the device shuts down Darlington NPN output stage or reduce the output current to

prevent device damage. The device automatically resets from the overload. The output may be reduced or

alternate between on and off until the overload is removed.