TPS65217D - Recommended Batteries for RTC Backup?

Adam,

TPS65217 does not have an integrated RTC. For coin cell backup with TPS65217 we recommend adding an external 1.8V LDO:

These are some popular coin cell choices:

Greg,

Thank you for the quick and valuable feedback.  Just a couple more questions

1. Those are all non-rechargeable.  What recommendations for rechargeable?
2. How would the recommended circuit above work with the 65217, relative to its pushbutton/wakeup/pwr_en solution?

Thanks,

Adam

Hi Greg,

Do you have any input on this?

Adam

Adam,

I don't currently have an example configuration using rechargeable coin cells, but any 3V battery should work fine in place of the coin cell in my diagram.  Rechargeable coin cell batteries tend to have a much smaller capacity then no rechargeable, this may make it harder to reach your desired 1 yr lifetime.

The system power in my diagram can be connected to the SYS output of the TPS65217, this will allow the PMIC power path to select the appropriate power source.  The rest of the PMIC functions (nWakeup, PWR_EN, etc.) should continue to operate as normal.