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BQ41Z90: BQ41Z90 - Power MOSFETs arrangement

Davide Sarti
Prodigy 70 points

Part Number: BQ41Z90

Hello,

In my design, using the BQ41Z90, I'm thinking about the power MOSFETs arrangement.

Architecture wise, the charge and discharge MOSFETs will be placed in series; hence, we'll have a single charge/discharge line. 

Now, I'm evaluating the possibility to put the MOSFETs in a front-to-front manner (common drain) instead of a more standard back-to-back arrangement.

From the BQ41Z90 point of view, is there any limitation to that? Is the MOSFETs control still feasible and efficient if I use the front-to front configuration? 

I also see that in the Evaluation Board the MOSFETs are placed front-to-front on the series line, so I guess it is feasible indeed...but I'd like to know if there's any known limitation or disadvantage.

 

Thanks in advance,

Davide

  • 0
    TI__Mastermind 39065 points

    Hello,

    This question has been assigned within the team and will be reviewed and followed up with another application engineer when possible. In the meantime please attach any associated .log/.gg files associated with the projects

    Thank you,
    Alan 

  • +1 in reply to Alan Frias
    TI__Mastermind 27421 points

    Hello, 

    I do not see any obvious disadvantages to this other then the physical difference of having 2 power paths (one for charging and one for discharging) as opposed to just a shared power path for charging and discharging. Ultimately, I recommend to follow the schematic of the EVM. 

    Regards, 

    Jonny. 

  • 0 in reply to Jonny
    Prodigy 70 points

    Hello Jonny, 

    Thanks for your answier.

    WIth the drain to drain configuration we would still have a single power path; anyway good to know that are not particular disadvantage.

    Thanks again!

    Davide