TPS4H000-Q1: T(logic)=? for Thermal swing feature

Hi James,

Please refer to the datasheet (section 8.3.6.5.1 and Figure 31) for the best explanation.

Thermal swing is a protection mechanism integrated in the device. It is not something that the end user can control or change because this protects the device from damage caused by a fast spike of current or fast increase of power dissipation through the device. The idea behind thermal swing is that in the situation where a fast high power event occurs, the temperature of the FET will increase much faster than the temperature of the internal controller. 

The device is always monitoring both temperatures and when it sees this large delta, it understands that a high power event has taken place. Thermal swing then kicks in and turns off the device until the delta between these temperatures reduces below the hysteresis window (spec'd in the datasheet). Then, the device turns on automatically again. In the event of a long failure, this will continue till the device hits thermal shutdown.