Thermal protection disables the output when the junction temperature rises to approximately 175°C, which then allows the device to cool. This feature limits the thermal dissipation and rise in junction temperature within the regulator, thus protecting the regulator from damage as a result of overheating. When the junction temperature cools to approximately 160°C, the output circuitry enables. Although the device is be enabled at such high temperatures, the device parameters and performance are specified up to a junction temperature of 150°C. Power dissipation, thermal resistance, and ambient temperature are the parameters that determine if the thermal protection circuit becomes enabled. When enabled, unless the power dissipation or the ambient temperature (or both) are reduced, the protection circuit continues to cycle between on and off states.

The internal protection circuitry of the TPS7B4261-Q1 is designed to protect against overload conditions. The circuitry is not intended to replace proper heat sinking. Continuously running the TPS7B4261-Q1 into thermal shutdown degrades device reliability.