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您好，Q3 body diode connects SYS to battery all the time. To disconnect, a second, in series FET with diode facing the other direction is required. The charger turns on Q3 after the input voltage drops below the UVLO point per OVPSET resistors. A supervisor and reset circuit that monitors V(BAT) and controls the back to back FETs instead of or in addition to /BATDRV pin could provide undervoltage protection.
您好，There is a path through the inductor, to SW pin through through the buck high side FET body diode to PVCC to give V(BAT)-0.6V. If Q3 is installed, V(SYS)=V(BAT).
