ADVANCE INFORMATION for pre-production products; subject to change without notice.
The junction temperature (TJ) of the device is monitored by an internal temperature sensor. If TJ exceeds 170 °C (typ), the device goes into thermal shutdown. Both the high-side and low-side power FETs are turned off and PG goes low. When TJ decreases below the hysteresis amount of typically 20 °C, the converter resumes normal operation, beginning with Soft-Start. During a PFM pause, the thermal shutdown is not active. After a PFM pause, the device needs up to 9 µs to detect a too high junction temperature. If the PFM burst is shorter than this delay, the device will not detect a too high junction temperature.