This is a reliability doubt regarding an LDO. I was attending a conference on hi-reliability application of PMICs. During such a discussion one of the speakers said that when using an LDO ina hi rel application, the worst case is that the LDO fails and the input comes at the output as it is. Suppose Vin = 3.3V and output = 1.8V, when it fails Vout = 3.3V.
So one must make provisions to protect it. How can that be done ? Would using a TVS protection(unidirectional) diode do the trick ? So basically it will clamp the Vout to a more manageable,say 1.5V or so. is this a good approach ?