TIDA-00318: Breaking out BQ51003 BGA or leaving pins floating

Hello,

I have some prototypes of the QFN package version ordered, but I want to try the BGA version as well.

Since AD-EN and CHG are floating, perhaps their balls don't need to attach to anything either, so maybe I can try something like this:

Yes, OK to float /AD-EN and /CHG, no problem with IC.

Not sure about the SMT issue and producibility with no pad for the solder balls.

OK, thank you. The via-between-pad for RECT didn't work out.

How about leaving one of the AC1 and GND pads disconnected? Do duplicate BGA pins have connections inside the IC?

I received the QFN prototypes and they are functioning well. The range with the TI prototype is a lot higher than just taking a Universal Qi Wireless Receiver Module : ID 1901 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits and replacing the coil, perhaps because of the optimized resonant tank capacitors.

Unfortunately, it doesn't work well enough to couple with the random smartwatch Qi transmitter that I found on Amazon, and I had to replace that transmitter coil with a known good coil for it to work at a standard distance. Are there any Qi transmitter circuits that you can recommend, TI or otherwise, for the transmitter PCB design?

I will contact you.