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BQ24610EVM: Differences in Specifications on the BQ24610 IC and BQ24610 EVM

James Hinshaw
Prodigy 40 points
Part Number: BQ24610EVM
Other Parts Discussed in Thread: BQ24610

Hello,

There are few differences I have noticed between the specifications listed on the BQ24610 IC and BQ24610 EVM. Specifically, the rated input voltage is 33V on the bq24610 datasheet, but only 28V on the evaluation module. In addition the max charging current on the module is 8 A compared to 10 A on the IC. What is driving the differences listed in the IC and the evaluation module? I would like to make the necessary changes to run at the maximum input voltage and 10A battery charging current. Actually, I was hoping to use 8 series Li-ion cells (max 33.6 V) as my input power, but am aware that this could cause issues with IC. Thus, are the maximum specifications listed on the datasheet "absolute" or are there any engineering tolerances that allows for higher but less reliable operation?

Thank you for your time and consideration.

  • +1
    TI__Mastermind 24075 points

    Hi,

       33V is the absolute maximum of the IC, however 28V input voltage is the max recommended operating condition of the IC. Since EVM shows operating condition, we show 28V on there as the max operating condition. As this is a controller, the charge current does not depend on the IC, but choice of external FET and external RSR sense resistor. You can achieve 10A with the IC depending on choice of external components (external care to be paid to layout for heat sinking etc). EVM cannot be designed for all possible conditions as it is a charge controller with many different possible configurations.

    You cannot use 33.6V input source for this device. The extra VIN is safety headroom in built between 28V max recommend operating condition, and 33V abs max. Above abs max there is no guarantee IC would not be damaged.

    Currently we do not have charger IC able to support more than 28V input source.