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BQ24190: Parallel BQ24190 Chargers

Matthew Lowell
Prodigy 40 points
Part Number: BQ24190
Other Parts Discussed in Thread: BQ25896, BQ25892, BQ25890

We have a device which possess two USB ports, where either port can support charging or OTG.

Is it safe to place two BQ24190 connected in parallel to the VBATT rail?  I cannot find any information about the isolation of the VBATT pins within the BQ24190.

  • 0
    TI__Guru**** 166136 points
    Matthew,

    Yes you can parallel two chargers by connecting their BAT pins but not the SYS pins. The document below explains the pros and cons.

    www.ti.com/.../slyt651

    In short, the main charger provides the SYS output and the CC current while the second charger provides the CC current only. The second charger terminates early to prevent conflicts when both chargers are trying to terminate.

    The main issue when paralleling two charger's with the same I2C address is how to control which one the host is communicating with.
  • 0 in reply to Jeff F
    Prodigy 40 points
    Hi Jeff,

    Thank you for the response.

    I reviewed the link you sent, and it does provide some insight. However, in our implementation, our VBUS nets are separate (different USB connectors). We're hoping to be able to charge with one, while supplying OTG power to the other. I'd like to make sure that this is possible?

    We do have the SYS pins connected together, and I can see now how that could be a problem.
  • 0 in reply to Jeff F
    TI__Guru**** 166136 points
    Matthew,

    Yes, you should be able to simultaneously run one in charge and the other in OTG. You might consider changing to a later version of the 19x family, the BQ25890 family, which has a 2 versions with different I2C addresses (BQ25892 and BQ25896). The registers are slightly different but the functionality is the same. And there are additional features like integrated ADC.