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BQ25886: Inquiry regarding BQ25886

Grady Lee
Genius 3265 points
Part Number: BQ25886

Hi, TI expert

A customer is considering the BQ25886 and has a few questions.

Looking at the datasheet of BQ25886, it appears that BC1.2 is supported.

According to the document, if the input is 5V and the charging current is 2A, it becomes 10W.

However, BC1.2 Spec is 7.5W as shown below.

Accordingly, we would like to inquire as follows.

Q1) Even though it's labeled as BC1.2, is it correct that it charges at 2A (10W)?

Q2) When connecting the QC adapter, is the charging current automatically adjusted according to conditions?

Q3) When connected to a PC, is the charging current automatically adjusted depending on USB 1.0 and USB 2.0?

Q4) The USB line is intended to be connected to the BQ25886.  So, the BQ25886 will be connected to both the AP.
As you know, USB lines require impedance matching.
If there is a separate design guide available, could you provide it?

Please check. Thank you.

  • 0
    TI__Guru** 103395 points

    Hello Grady,

    You can find the supported USB detection methods in the datasheet in section 8.3.3.2.1 D+/D– Detection Sets Input Current Limit. The BQ25886 can identify a number of different adapters, the flow chart shows how it will determine what adapter is attached in order to limit current to abide by BC1.2.

    The BQ25886 does not support QC adapters.

    Yes the charger will adjust the IINDPM limits depending on the adapter that is connected following the flow chart: Figure 13. D+/D- Detection Flow

    We do not provide a guide on impedance matching for D+/D- lines, after the adapter detection process the inputs to the charger will go high-Z in order to allow other ports to use data lines.

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Genius 3265 points

    Hi  Wyatt Keller

    What is the maximum current of the power path of BQ25886?

    Can I check which part it is in the datasheet?

  • 0 in reply to Grady Lee
    TI__Guru** 103395 points

    Hello Grady,

    I believe you are looking for the max recommended current for the BQ25886:

    Sincerely,

    Wyatt Keller

  • 0 in reply to Wyatt Keller
    Genius 3265 points

    Hi, Wyatt Keller

    So, can we say that the maximum current of the power path is 5A, which is Ibat_rms (RMS dischargnig current with internal MOSFET)?

    Unlike other battery charger ICs, there is no Isw (sw current) information or Isys (sys current) information, so it is confusing.

    Please check. 

  • +1 in reply to Grady Lee
    TI__Guru** 103395 points

    Hello Grady,

    5A is max RMS current through the BATFET, it is not the total system load the charger could supply using supplement mode. This would be the charge current plus any current from the battery (5A+2.2A) as long as the over current protections are not tripped: 8.3.10.1.4 System Over-Current Protection.

    Sincerely,

    Wyatt Keller