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BQ25890: BQ25890 vs BQ25713

Ganesan Manikandan7
Intellectual 285 points
Part Number: BQ25890
Other Parts Discussed in Thread: TPS61230A, , BQ25713, BQ25895

Hi, 

For my new project, I'm designing a NVDC power architecture with USB-C input (able to provide 5V @ 4A from an adapter) and a single cell Li Polymer 3.7 V nominal battery. The cell capacity is ~2000 mAh with 1C charge but the system load requires around 4.5A average current. The battery has 3C discharge capability and the battery run time is not an issue for the application (hence the low capacity). I also have to boost up the VSYS to 5V and I've selected the TPS61230A at 2.4 A. 

For the charger, I'm looking at the BQ25890/92 but quickly realized the input current limit cannot be set to more than 3.25A. This means at 5V, I'll only get ~16.25W of input power. After efficiency losses, this might not be enough for my application.

Can the BQ25713 solve the problem and also eliminate the need for TPS61230A with the integrated buck/boost? Is there a better part you can recommend for my design?


Any input is appreciated as I'm finding my way through the high power devices of the BQ family. I've already used the 24160 in a previous application with success.

Thanks in advance!

Best,
Ganesan M.

  • 0
    TI__Guru 57541 points
    Looping the BQ25713 support...
    Thanks!
    Please click "This Resolved my issue" button if this post answer your question.
  • 0 in reply to Ning T
    TI__Genius 16175 points

    Ganesan,

    For your system and charge loading specification, I think BQ25713 can support it. But could you advise more detail about your TPS61230A usage? I think simple block diagram will be better to understand.

    Thanks

  • 0 in reply to Paul Yeh
    Intellectual 285 points

    Hi Paul,

    Thanks for the reply. I've attached an image of the block diagram.

    I'd also like to understand if the max charge current for a BQ part is rated at 5A per the datasheet(for eg, the BQ25895 also with an integrated boost), can it charge the battery at 1A and pull the remaining 4A to supply the system if the load requires it? What is the input current limit on the VBUS pin for BQ25895 and the BQ25713 at 5V? (as USB is my only option for power in)

  • 0 in reply to Ganesan Manikandan7
    TI__Genius 16175 points

    Ganesan,

    For BQ25895, I saw its input current max value is 3.25A, so it can't meet your input spec. that is 5V/4A.

    And BQ25895 can support 4A for system and 1A for charging.

    For BQ25713, due to this part uses external MOSFET solution, so its input current can support up to 6A.

    Thank you and Regards