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BQ51050B: Charging current lower than specified in datasheet

Wout Geeurickx
Prodigy 235 points
Part Number: BQ51050B
Other Parts Discussed in Thread: BQ25100, BQ51003, TIDA-00318

Hello,

We are planning to use the BQ51050B as a wireless charger for a medical device. We intend to charge a battery at a max Ibulk of 60mA, but the datasheet mentions that the minimum Ibulk is 500mA. As this will be used in a mass-produced medical device, we need to prove that everything works according to the intended use stated in the datasheet. I know it is possible to set Ibulk to 60mA by setting the right resistor value, but this would not be according to the datasheet. Is it possible to receive a formal declaration/statement from TI that the BQ51050B is able to work with lower charging currents, or should I look at other solutions such as TIDA-00668 with the combination of bq51003 and bq25100? I hope this can be prevented as the design has very strict size constraints and we hope to save the space required for the bq25100.

Best regards,

Wout

  • 0
    TI__Guru 65666 points
    Hi Wout
    The best solution would be bq51003 and bq25100, TI reference design TIDA-00318. Control of charging current and accurate termination at low current would be provided by the 25100 device.
    The bq5105X accuracy at low charge and termination may not meet your requirements.