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BQ28Z610: BQ28Z610 schematic query

Part Number: BQ28Z610


The customer design with BQ28Z610, when the battery charge full CMOS turn off, pack voltage 8.6V.

Attached the schematic for your reference.

The Source voltage of CHG MOS is 8.4V, the drain voltage of DSG MOS is 8.6V, and the drain and source voltage of DSG MOS is 8.6V.

Why the DMOS has 0.2V differential?