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BQ25895: Current limit with DCP

David Park
Expert 7310 points

Part Number: BQ25895
Other Parts Discussed in Thread: BQ25898D, BQ25890H, TUSB422

Hi,

BQ25895 is adopted for powerbank.

In evaluation with general USB charger, charge current is about 1.67A.

BQ25895 ILIM resistor is set to 2A and charger is connected as DCP as below.

therefore, IINLIM is 3.25A but measured charge current is about 1.67A.

Is it limited by USB charger? USB charger supports 5V, 9V, 12V, 3A and QC3.0.

How can BQ25895 get 12V, 3A from this charger?

Could you check below register set?

Thanks.

  • 0
    TI__Guru**** 180286 points

    Hi David,

    bq25895 is compatible with older HVDCP adapters (including QC2.0) and can negotiate up to 12V.  With host firmware, bq25895H and bq25898D are compatible with newer HVDCP adapters as explained in the appnote below:

    Unlike bq25895 which provides its OTG output at the PMID pin, bq25890H and bq25898D provide the OTG output at the VBUS pin.

    For compatibility with USB Type C PD sources, you will need to add a second IC like TUSB422 and related firmware/software which can negotiate up to greater than 5V.

    For all of the previously mentioned devices to reach 3A, you will need to disable the ILIM pin, which clamps input current below the IINLIM register setting, using the EN_LIM register.