Hello,
I am using TPS62560DRVR in one of our designs. The device is observed to go bad in nearly 12 board out of 50 assembled for proto build. In all the faulty boards the SW pin to GND resistance is observed to be <30 ohms. The device was working for a brief period of time, once kept idle for a day and started again next day, these were observed to go bad. Please find attached the relevant section of schematics for your reference.
I have seen a similar thread, but the reason was not concluded. There was a mention of improper layout in that thread, can you please share what could go wrong in the layout to cause this issue. I will not be able to share the layout.One point to mention is that the feedback loop is spilt between top and bottom layers due to digital potentiometer and the smaller PCB size required.
I have selected this device specifically for the fixed PWM operation and LDO feature. The application require 1.8V - 5V operation from USB with low ripple at light loads.
Please let me know the root cause/solution at the earliest, we need to go to production by Q4, with approx. 10K volumes/annum.
Regards,
Avinash Aravindan