Dear expert,
My customer is using LMR16030, VDD_SYS_4.2V is system power for load and BATTERY_3.7~4.2V is the battery. Now they need to maintain the PGOOD function even if Vin is off, so wondering if adding the diode (in the left upper corner) can keep the PGOOD function(1.6~1.95V output) from BATTERY_3.7~4.2V battery voltage when Vin is off.
From my understanding, after Vin is off, VDD_SYS_4.2V will always be higher than Vin, therefore the upper FET will be off so FB voltage is low and PGOOD function can't perform. Am I right? If so, please share your suggestion about how to achieve the PGOOD function even if Vin is off, thanks!