We are using the part TPS73633MDBVREP in one of our circuit. During the environmental test, the part was exposed to the environment (-40 degC for 90 min and +71 degC for 90 min). The part got malfunctioned during the process. When we checked the output voltage of the part after malfunctioning, it was showing 2.5 V permanently. We are not able to find the reason behind the same. We request you to please help us to know the reasoning behind the same and suggest the solution.