We are observing multiple device permanent failures after powering up below circuit using MPM3840. The damaged MPM3840 devices shows a short from OUT pin to GND.
We do not have C186 and R134 installed.
The behavior is observed after power cycling the board a couple of times. When we use a fresh MPM3840 device, everything looks normal (VIN is at 5V, OUT is around expected 3.3V, MODE pin is around 2.5V). The enable signal comes from an external card and is at 5V. However, after power cycling the circuit couple of times, this device get a permanent damage showing 0 ohms resistance between its OUT and GND pins (under power off conditions). We have removed the faulty device and tried to provide an external supply (from a power supply unit) to the load circuit (PCIe Generator circuit based on LMK3H0102RERT) and verified that our load currents are only around 25mA and the load circuit is working as expected. We are now seeing such failures on multiple boards and our project is blocked. Hence we are requesting urgent help on this topic.
-Rejo