Thermal protection disables the output when the junction temperature rises to approximately 178°C, allowing the device to cool. When the junction temperature cools to approximately 152°C, the output circuitry is enabled. Depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may cycle on and off. This cycling limits the dissipation of the regulator, mitigating damage as a result of overheating.

Any tendency to activate the thermal protection circuit indicates excessive power dissipation or an inadequate heat sink. For reliable operation, limit the junction temperature to a maximum of 125°C.

The internal protection circuitry of the TPS7H1210-SEP has been designed to protect against overload conditions. It was not intended to replace proper thermal management. Continuously running the TPS7H1210-SEP into thermal shutdown degrades device reliability.