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TPS65217: Changing LDO outputs

Part Number: TPS65217
Other Parts Discussed in Thread: TL5209

Hi everyone,

I am using TPS65217C on my board and I have used the Beagle bone black as my reference. I am using Li-Ion battery to power the system and will get charged simultaneously.

To increase the efficiency I want to use VBAT from 3V - 4.2V, so that I changed the UVLO to 2.73V and maximum charging limit to 4.2V. For this range of VBAT I changed the LDO2 and LDO4 output to 2.8V. After this change board worked fine for 2 days, but later voltage at LDO2 and LDO4 is 0V and respective pins also got shorted to GND. This happened with 2 boards.

Could you please tell the reason behind this behavior

Thank you