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BQ21040: Can I use this module with a Wurth Electronics coil (760308101216) for wireless charging?

William Pitts
Prodigy 10 points
Part Number: BQ21040
Other Parts Discussed in Thread: BQ25176M

Tool/software:

I am designing a product with wireless charging, and I was going to use a module designed specifically for wireless charging, but the price was too high for my product design. I planned on using the BQ21040 module with a Wurth Electronics Rx coil (760308101216) for the receiver side and an IC OSC timer 100kHz (SA55P) in combination with a Wurth Electronics Tx coil (760308101104) for my application on the transmit side. I am specially using the BQ21040 for it's cheap price point. I feel like the design will work, but I am worried about the airgap that will be required. Please provide any feedback regarding the use of this module for wireless charging.  

  • 0
    TI__Guru 71166 points

    Hello

    The BQ21040 has an OVP trip point of 6.6V, would work for a well-regulated power input.  But your Wireless power Design may have more variation.  A better device to consider is the BQ25176M, the OVP in 18V and unit has input DPM which would help.

    What is your battery size and charge current?