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BQ25798BKUPEVM: Why all these DNP components on SW1 and SW2?

Nicolas Montoya
Prodigy 30 points
Part Number: BQ25798BKUPEVM
Other Parts Discussed in Thread: BQ25798

Tool/software:

I am referencing the evaluation kit for the BQ25798 and designing my own PCB from it, and I am confused on what these components, circled in green, are potentially used for

Thank you!

  • +1
    TI__Guru**** 165856 points

    Hi Nicolas,

    The resistor and capacitors are for adding an RC snubber in the event that the switching noise causes too much EMI.  If installed, the diodes would be in parallel with the internal FETs' body diodes.  These diodes are primarily for debug during IC validation or in case of IC failure.  

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 30 points

    Oh ok that makes sense for the EMI, so if I just want to be safe I should I just add support for the RC snubber, or just populate that anyways since I won't hurt the performance anyways right? I am planning on switching at 750 KHz since I have the real estate for it, and it's more efficient as well..

    I am still confused on that diode pair... How exactly do those diode pairs help for debugging an IC failure? What steps would I follow in order to troubleshoot that properly? Why PMID and SYS are connected to those switch nodes?

    Thanks