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BQ79631-Q1: Why BQ79631 Evaluation Board convert 12V to 5V and then back to 12V?

Batuhan Yavasoglu
Prodigy 200 points
Part Number: BQ79631-Q1

Tool/software:

Hi,

I have been working with the BQ79631 Evaluation Board and noticed an interesting aspect of its power management design. Specifically, the board takes a 12V input, steps it down to 5V, and then steps it back up to 12V. I am curious to understand the rationale behind this design choice.

Could someone please explain the reasons for converting 12V to 5V and then back to 12V on the BQ79631 Evaluation Board?

Any insights or detailed explanations would be greatly appreciated.

Thank you!

  • 0
    Prodigy 200 points

    I am considering modifying the design to accept a 24V input instead. Before proceeding, I would like to understand the schematic above and if there are any specific considerations or potential issues with this modification.

  • 0 in reply to Batuhan Yavasoglu
    Prodigy 200 points

    Additionally, is there any TI referance design you know for 24v 12 dc dc and 12v 5 v dc dc ?

  • 0 in reply to Batuhan Yavasoglu
    TI__Expert 4240 points

    Batuhan,

    According to the schematic in the EVM User's Guide (link), you are not supposed to populate the top left box of your schematic

    If you wish to power the device using a different voltage, be aware of the maximum ratings of the pins found in the datasheet (link). The maximum voltage allowed on the power pins is 24 V in any circumstance. I can only recommend that you follow our schematic and guidelines in our datasheet and EVM User's Guide.

    I am not aware of any reference designs for 24-12 dc dc or 12-5 dc dc.

    Regards,

    Ben