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BQ500212A: PCB Printed coils

Sebastien Rougeot
Prodigy 80 points
Part Number: BQ500212A

Hi Team, 

I received the following request from a customer:

"We have a Qi charger design based on the TI BQ500212A (basically copied from the EVM with an added micro and DC-DC).

 We’re interested in trying to reduce the cost of the BOM, and were wondering whether TI have every tried using PCB Printed coils rather than the expensive ferrite-based coils. I appreciate the field pattern may not be great, but if it works that’s fine. We are actually not interested in Qi compliance either, since it’s a product-specific charger."

Could you please advise on this question? 

Thank you in advance, 

Sebastien

  • 0
    TI__Guru* 75656 points
    Hi Sebastian
    This has not been done on the 5V input devices (bq500212A). It will require several layers of copper to keep the DCR of the coil low, at 5V current will be high. The PCB will only replace windings and ferrite plate will still be needed.
    The 5V coils are in high volume production and should be cost competitive.