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BQ24702: BQ24702 single cell OK?

Alex Dolgin1
Prodigy 90 points
Part Number: BQ24702
Other Parts Discussed in Thread: BQ25606

We use the bq24702 in 2 and 4 cell (Li-Ion) charger product for years. Have a new requirement for a 1 cell Li-Ion charger. Is there a reason it will not work? Will changing resistor values in the existing PCB so the charge V is 4.2V and proper BATDEP is set all that is needed? SLUS553E does not seem to indicate if it is ok.

  • 0
    TI__Expert 5330 points

    Hi Alex,

    The BQ24702 was not designed for single-cell Li-Ion use.  It requires a minimum of 2-cell in order to power from battery when no adapter is present.

    We have recently released the BQ25606

    http://www.ti.com/product/bq25606

    This is a standalone single-cell device that might fit your application.  Can you take a look at this device and if it does not meet your requirements, let me know what additional features you require?

    Thanks,

    Steve

  • 0 in reply to Steve Preissig
    Prodigy 90 points

    Thank you Steve, our product uses the IC in strictly charging application. No need to power from the single cell battery. Will it charge? (will not redesign the existing PCB to accommodate another IC as it is to be a very limited volume production) 

  • 0 in reply to Alex Dolgin1
    TI__Expert 5330 points

    Hi Alex,

    Because of the limitation listed above, we have never tested/validated the BQ24702 in a single-cell application.  You're asking if the device may be used outside of the scope of what it was designed for and has been validated for.  I don't mean to be difficult, but I just cannot recommend that you use the device in a manner that we have not tested.  

    You can see from the product page that the device has been qualified for use in 2, 3 and 4 cell applications.  This is the only scope for which I can recommend it be used.

    Regards,

    Steve

  • 0 in reply to Steve Preissig
    Prodigy 90 points
    Understand, thank you Steve