LM2941, LM2941C

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SNVS770I – JUNE 1999 – REVISED JANUARY 2015

Feature Description (continued)

7.3.3 Thermal Shutdown (TSD)

The LM2941 contains the thermal shutdown circuitry to turn off the output when excessive heat is dissipated in

the LDO. The internal protection circuitry of the LM2941 is designed to protect against thermal overload

conditions. The TSD circuitry is not intended to replace proper heat sinking. Continuously running the device into

thermal shutdown degrades its reliability as the junction temperature will be exceeding the absolute maximum

junction temperature rating.

7.3.4 Thermal Overload Protection

155°C.

Should the LM2941 see a fault condition that results in excessive power dissipation and the junction temperature

approaches 155°C, the device will respond by reducing the output current (which reduces the power dissipation)

to hold the junction temperature at 155°C.

Thermal Overload protection is not an ensured operating condition. Operating at, or near to, the thermal overload

condition for any extended period of time is not encouraged, or recommended, as this may shorten the lifetime of

the device.

7.4 Device Functional Modes

7.4.1 Operation With ON/OFF Control

The ON/OFF pin has no internal pull-up or pull-down to establish a default condition and, as a result, this pin

must be terminated externally, either actively or passively. The ON/OFF pin requires a low level to enable the

output, and a high level to disable the output. To ensure reliable operation, the ON/OFF pin voltage must rise

above the maximum ON/OFF(OFF) voltage threshold (2 V) to disable the output, and must fall below the

minimum ON/OFF(ON) voltage threshold (0.8 V) to enable the output. If the ON/OFF function is not needed this

pin can be connected directly to Ground. If the ON/OFF pin is being pulled to a high state through a series

resistor, an allowance must be made for the ON/OFF pin current that will cause a voltage drop across the pull-up

resistor

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Product Folder Links: LM2941 LM2941C