In my ADP5091 design I have grounded BACK_UP and SETBK. However this means that on a cold start, even with a full battery, there needs to be some power on VIN to charge SYS using the cold start pump.
Is it safe to connect BACK_UP to BAT (and connect SETBK to AGND) to allow the ADP5091 to draw power from the battery during the cold start? I just need switch S1 in the datasheet to turn on and don't need any other backup features.
Thanks in advance!