The TPS212x devices have built-in absolute thermal shutdown and relative thermal shutdown to ensure maximum reliability of the power mux. The absolute thermal shutdown is designed to disable the power FETs, if the junction temperature exceeds 160°C (typical). The device auto recovers about 25 ms after T_J < [T (TSD) – 10°C]. The relative thermal shutdown protects the device by turning off when the temperature of the power FETs increases sharply such that the FET temperature rises about 60°C above the rest of the die. The device auto recovers about 25 ms after the FETs cools down by 20°C. The relative thermal shutdown is critical for protecting the device against faults such as a power up into a short which causes the FET temperature to increase sharply.