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Selecting proper ICs for USB Type-C Fast Battery Charger Scenario

Oguzhan Caliskan
Prodigy 10 points
Other Parts Discussed in Thread: TUSB322, BQ25887, BQ25882, TUSB320LI

Hello,

I would like to design a USB type-c fast battery charger stage  for my portable device using TI products.

But I cannot select the proper ICs for this solution.

Let me give some details about it.

Power input of the system will come from type-c wall adapter. Usb 2.0 data line will seperated and be connected to the MCU inside my device.

Battery charger will act for 2 series and 2 parallel li-ion batteries.

Balancer and/or other protection ICs for battery cells.

Could anyone help me to find proper ICs for this specific scenario?

Thanks in advance.

  • 0
    TI__Guru*** 147125 points

    Hi Oguzhan,

    If you aren't using a USB type-c source that requires communication over the CC1/CC2 lines, then you could use BQ25887 up to 2.5A boost charger with passive balancing.  It has D+/D- lines and autosets its input current at startup over the D+/D- lines.  After that, the charger's D+/D- pins go high impedance and the MCU can use those lines for communication.   A USB type-c source requires communication over the CC1/CC2 lines to provide 5-V and to set the output current.  A communication chip like TUSB322 or similar would also be required.

    Regards,

    Jeff  

  • 0 in reply to Jeff F
    Prodigy 10 points

    Hi Jeff,

    Thank you for your answer.

    I was wondering how I connect the D+/D- lines. While the charger pins going high impedance, still there will be a T branch on the layout. It will turn into a net antenna. It can cause any problems?

    I took a look at BQ25887. It's working for 2S1P batteries. When I connect 2S2P battery, how it's managing the parallel cells?

  • 0 in reply to Oguzhan Caliskan
    TI__Guru*** 147125 points

    Hi Oguzhan,

    The D+/D- communication frequency is below 1MHz so I do not expect transmission issues.  No other customers have complained.

    Parallel cells self balance.  The only issue would be if the charge current cannot charge your battery's capacity in the time your application requires.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 60 points

    Hi Jeff,

    Did you mean to say BQ25882/3/6 rather than BQ25887?
    Unless I a missing something, the BQ25887 does not have D+/D- lines.
    But the BQ25882/3/6 devices do not have cell balancing.

    I am looking at a similar application and need my host processor to communicate on the D+/D- lines and want cell balancing too.

    So, I am thinking TUSB320LI for CC1/CC2 control plus a BQ25887. Then connect the D+/D- to my USB-UART bridge.

    Regards,

    Derek

  • 0 in reply to Derek H
    TI__Guru*** 147125 points

    Hi Derek,

    I choose BQ25887 for its passive cell balancing.  As you have found, there are other ICs that can do the USB communication.

    Regards,

    Jeff