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BQ25756EVM: BQ25756

Achim Wack
Prodigy 220 points
Part Number: BQ25756EVM
Other Parts Discussed in Thread: BQ25756,

Hi!,

why is the EVM specified for 4,2 to 55V and the BQ25756 itself has a range of 70V?

Best regards,

Achim

  • 0
    TI__Mastermind 30755 points

    Hello Achim,

    The BQ25756EVM has smaller clearance than normally used on high voltage boards as well as not having an isolation boundary. The 55V was specified to give headroom when dealing with switch node spikes along with the max gate drive voltage.

    Best Regards,
    Ethan Galloway

  • 0 in reply to Ethan Galloway
    Prodigy 220 points

    Hi Ethan,

    thanks for this explanation! EVM is ordered :-)

    Is TI planning also an charger for 15s Li-Ion? Would be great, because the BQ769x family of AFEs also is available for up to 15s :-)

    Best regards,

    Achim

  • 0 in reply to Achim Wack
    TI__Mastermind 30755 points

    Hello Achim,

    Your welcome!

    The BQ25756 can charge up to a 16S battery. Quick explanation for this, the datasheet lists 14S as the cell count to leave room for potential voltage spikes from the battery. The max charge voltage is 70V.

    When you are using the BQ25756 to charge above 60V, I recommend a Zener/TVS diode or other protection for voltage transients like from a battery hot plug.

    Let me know if you have any more questions.

    Best Regards,
    Ethan Galloway