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BQ25892: Recommend the chip similar with BQ25892.

Star Xu
Genius 9645 points
Part Number: BQ25892
Other Parts Discussed in Thread: BQ25798, BQ25731

Hi

The design is 3 series cells, the input power is 15V/6.4A. The charging current of the three series of battery packs can reach 8A. The NVDC battery pack is also required. Also need the charger seamlessly transitions between the buck, boost, and buck-boost operation modes without host control.

Based on this demand, is there a suitable charger similar with BQ25892?

Waiting for your reply.

Thanks

Star

  • 0
    TI__Guru*** 143870 points

    Hi Star,

    TI does not have and likely will never have a single integrated FET charger than provide 8A and 3*4.2V = 12.6V = 100.8W.  The losses in FETs will be too high, resulting in the charger IC clamping its output due to thermal regulation. 

    The closest fit would be two BQ25798's in parallel, with only one being set to provide termination.  The BAT pins are tied together but only one SYS pin can provide the SYS because the SYS pin cannot be tied together, unless with ideal diode circuits like LM5050 ideal diode controller or similar. This solution would also require a switch to isolate each charger's I2C pins since they have the same I2C address.  Once the I2C registers are configured at power up, the charger runs standalone.

    The other. likely best, option is a charge controller plus external FETs like BQ25731 or similar.

     Regards,

    Jeff