An internal temperature sensor monitors the junction temperature (T_J) of the device. If T_J exceeds 160°C (typ.), the device goes into thermal shutdown. Both the high-side and low-side power FETs turn off and PG goes into the high-impedance state. When T_J decreases below the hysteresis level, the converter resumes normal operation, beginning with soft start. To avoid unstable conditions, the device implements a hysteresis of typically 20°C on the thermal shutdown temperature.