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BQ41Z50: Does the BQ41Z50 require an external "Smart Charger" chip?

Kevin Banks
Prodigy 235 points
Part Number: BQ41Z50
Other Parts Discussed in Thread: BQ25720, TPS25730, BQ40Z50

Tool/software:

Document SLUAAF8 describes how some Texas Instrument gauges broadcast the ChargingCurrent() and ChargingVoltage() they want, and a separate "charger" part does the actual current and voltage regulation.

Is this the case with the BQ41Z50 as well?

In other words, is it really a two-chip solution instead of a 1-chip solution?

For example, on page 28 of the BQ41Z50 datasheet is section 7.3.3 Charge Control Features.

Does "Charge Control" in this case really just mean broadcasting the desired values and some other chip does the controlling?

If this is the case, what are some Texas Instrument parts that would be compatible with the BQ41Z50 that could fill this role?

  • 0
    Prodigy 235 points

    Related to "what parts could be used in conjunction with the BQ41Z50?" - I saw in another post that the BQ25720 could be a candidate.

    We also have the requirement that our input power ultimately comes from a USB-C PD source, so one possible combo would be TPS25730 + BQ25720 + BQ41Z50.

    Is there a better combo?

    Is there any part that is effectively a TPS25730+BQ25720?

    Is there any part that is effectively a BQ41Z50+BQ25720?

    Is there a single chip solution here that we are overlooking?

  • +1 in reply to Kevin Banks
    TI__Mastermind 27321 points

    Hi Kevin,
    The bq41z50 has the broadcast feature same as bq40z50. So the Autonomous charging SLUAAF8 app note also applies here.

    In autonomous mode the gauge will send the reported Charging Current and Voltage parameters to the charger. The requirement is that the charger needs to be SMBus compliant. The gauge will send to address 0x12, so the charger must have 0x12 as the device address. The gauge will be the host in this configuration. No MCU needed.

    You might want to check with the charger team if they have a charger solution with typce-C. From the gauge point of view, all you it needs is to be able to talk to the charger and transfer appropriate current and voltage values.