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BQ51221: Best Qi Wireless Charger Chip 5V@1A

Disco Inferno
Prodigy 90 points
Part Number: BQ51221
Other Parts Discussed in Thread: TIDA-00243, BQ51013B, BQ51021, BQ51020

Hello,

We are making a portable wireless device that we want to implement wireless charging into.

We had considered he BQ51221 chip but are afraid that it does not support the latest protocols and may become obsolete too early in our product's lifecycle.

The chip needs to provide 5V output at up to 1A. We were intending to use the TIDA-00243 example design until we discovered that it is not our prefect choice for the future.

We have already an onboard charger chip so only need a power-supply. We wish to give the second option that we can feed 5V @ 1A onto VBUS instead of incoming power from USB cable.

The BQ51013B is maybe an interesting alternative, but I am unsure.

Can you please recommend a device(s) that would be a good alternative, including hopefully a reference design such as the TIDA-00243?

Thank you.

  • 0
    TI__Guru 71366 points

    Hello

    The BQ51020 (WPC) or BQ51021(WPC) are better alternatives to the BQ51221(WPC+PMA).  They have similar pin out and will fit the TIDA-00243 form factor.  The 020 and 021 will support WPC only.  Units have been certified to WPC 1.2 standard.

  • 0 in reply to Bill Johns
    Prodigy 90 points

    Thank kindly you Bill for the answer.

    So, can the BQ51020 / BQ51021 be directly substituted into the TIDA-00243 circuit?

    What is the main/intended difference between these 2 chips?

    I did review these already but was a little skeptical about using these for a new design because the data sheet says they are only WPC1.1 certified as per 2014. Is there a new datasheet available?

  • 0 in reply to Disco Inferno
    TI__Guru 71366 points

    Hi

    The circuit change between 51221 and 020/021 is minor.

    BQ51021 has I2C control interface and control of over operation while the BQ51020 is a stand alone device.

    The devices were designed and certified to WPC1.1 and can be certified to WPC1.2.  The change from 1.1 to 1.2 for Baseline Power Profile (5W) did not change the RX, a few test were added.  The big change was addition of Extended Power Profile (15W) capability. New revisions to the standard are in work.

    If you need Qi certification on this and future products other manufactures may be a better fit for your application.  TI support of wireless power products is limited.