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BQ51025: How to chose coil for solution using BQ51025 ?

Son Nguyen Ngoc
Prodigy 150 points
Part Number: BQ51025
Other Parts Discussed in Thread: BQ51222, , BQ51003

Dear Support team,

I am designing a IP HD camera and I want to add wireless charger feature for my camera. My camera is so small (45x45x29mm), thus I must to chose a wireless power charger receiver solution that also has to small size.  

I intend to use BQ51025 or BQ51222 for the camera. But I don't have more knowledge about coils ( type, size, efficiency). Could you help me know more about coil and how to chose best coil for the camera ( smallest size but keep the best performance )?

  • 0
    TI__Guru 65856 points
    Hi Son Nguyen
    A good starting point for coil design is the coils used on the EVMs.
    Note that the bq51025 is a 10W RX and the coil for this power level will be larger.
    The bq51222 is a 5W RX it can be smaller than the 10W but will be a large coil.
    If you need lower power take a look at the bq51003.