I tried to program one of four TPS544B20's on my board using TI Fusion Digital Power Designer. I created an XML file for all four devices. I was able to program all four of these devices on another board using TI Manufacturing Tool. The board that I programmed using the TI Manufacturing Tool works fine. The board that I programmed via the Fusion tool is now "bricked" The reason that it is "bricked" is that this regulator drives the 5.0V to the rest of the board. All the other downstream regulators need the 5V to run.
The Fusion software reported no errors when I programed the 5V part. I captured the log and the 6 registers that I modified were correctly written to NV memory (per the log file).
When I powered the board off and then back on I realized that something had gone wrong. I am no longer getting 5V from the part. I lost PMBUS communication because my 3.3V rail is not up.
I then removed my output inductor to isolate the 5V on the board. I wired in an external bench supply and was able to power up the board. I then connected up TI Fusion and looked at the devices on the PMBUS. I should have seen four devices but only see three. The missing one is the 5V regulator. It looks like the part is bricked.
Anyone have any ideas what may have happened?
Thanks,
Rudy