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BQ24610EVM: BQ24610 7 cell application

Part Number: BQ24610EVM
Other Parts Discussed in Thread: BQ24610, , TPS54060

Hi All,

We found a BQ24610 EVM document that can support more than 6 cell as below.

bq24610EVM-603 7-Cell, Li-Ion Battery Charger.pdf

And I have 2 questions that need your help to confirm.

1. Why the power path function is not used in this application?

I think the Vbat is too high(33.6V) that over the spec of the BQ24610 BATDRV pin.

Because the voltage between system(VACN) and BATDRV is 4.2V~7V.

if the VBAT is too high then the BATDRV could not support it, am I right?  

  

2. We found a 1N4148 from TPS54060 output to the VBAT.

May I know why we use extra path (8.8V) to supply the VBAT?

Is more like a pre-charge function or does some battery require the minimum voltage?

I'm looking forward to your reply.

Thank you.