To close this thread out, I heard back from Octavo systems. The OSD3358-SM SiP used on the pocketbeagle internally connects the LDO1 regulator (I misspoke above) to both the RTC clock input (VDDS_RTC) as well as the VDDS input. The extra current is taken by the connection to the VDDS power input. So it looks like the pocketbeagle will never be able charge with the system shut down without the extra drain from the battery. The answer from Octavo is copied below. Their C-SiP package may be able to work in this situation.
https://octavosystems.com/forums/topic/unexpected-current-consumption-with-pmic-sleep-mode-for-battery-charging/#post-6895 "The additional current consumption comes from the fact that the OSD335x and OSD335x-SM use TPS65217C PMIC. If you look in the application note from TI (http://www.ti.com/lit/ug/slvu551i/slvu551i.pdf), you can see that in the case of the TPS65217C, both VDDS and VDDS_RTC are connected to the LDO1 output of the PMIC. The additional current consumption that you see is a result of the VDDS power input being connected to the LDO1. Unfortunately, the connection between VDDS and LDO1 is internal within the SiP and cannot be modified on the OSD335x and OSD335x-SM. However, we are in the process of characterizing the OSD335x C-SiP to see if it can support the power use case where VDDS is not connected to LDO1. We should have that characterization finalized in early January. Additionally, the TL5209 is enabled with an internal pull up within the OSD335x family of devices. In the OSD335x and OSD335x-SM, this connection cannot be modified. However, in the OSD335x C-SiP, there is a pin, SYS_VDD1_CTL, that will allow a user to disable the TL5209." -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/32297801-c226-4a96-a62d-7b5e96998b84%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
