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TPS65910 RTC power question



Hi,

My customer is using TPS65910A3 as power for AM335X.

In their schematic, they connected 0.22F Cbb. But they found the cap voltage will drop to 2V after one day shut down. We set the charge voltage to 3.3V, but seems this is not work. Do you have any suggestions to help to check something wrong? Thanks.