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BQ76942: Purpose of circuit in example schematic in application notes

Keshav Raj
Prodigy 170 points
Part Number: BQ76942

Hello,

I would like to know what function this circuit which is composed of an N channel FET performs. My first guess was some kind of gate protection on the discharge FET. But wouldn't the Zener (D5) be sufficient for this?

Cheers,

Keshav