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BQ25790: Request for recommendations for fast charging solutions for portable devices

JH Shin
Guru 11090 points
Part Number: BQ25790
Other Parts Discussed in Thread: TPS25750, BQ25890

Tool/software:

Hello,

My customer is looking for fast charging solutions that can support the following conditions.

   - Battery : 2 cells in parallel (1S2P)

   - Charging voltage : 4.2V~4.5V

   - Charging current : 5A or higher (10000mAh fully charged within 2 hours)

   - Fast charging: Supports USB-C PD, QC, Fast Charge, etc.

They are looking at a two-chipset solution, BQ25890 (charging chipset) + TPS25750 (PD controller), and a single-chipset solution, BQ25790.

Are the products they found suitable? If there are other more suitable solutions, please recommend them.

Thank you.

JH

  • 0
    TI__Guru**** 166776 points

    Hi JH,

    Both BQ25890 and BQ2579x have 3.3A max input current.  So, to get 5A charging of 1S, the input voltage needs to be >> 4.5V*5A/3.3V = 6.8V but not too much higher or the charger's efficiency drops.  This causes it the heat up, go into thermal regulation and reduce/clamp charge current < 5A.  Neither BQ2590 or BQ25790 have USB-C CCx pins so both would need a PD controller to negotiate with the USB-C port.  Even switching at 750kHz with a 2.2uH inductor, BQ25790 struggles to provide 5A and may go into thermal limit.

    https://www.ti.com/product/BQ25638 is the latest 5A charger. It is slightly more efficient than above options but will also need a USB-C controller IC to negotiate the USB-C port output voltage.

    Keep in mind that a discharged battery is pre-charged at <5A and there will be some charge current taper down time as the battery pack cells fully charge.  So, charge time will be slightly longer than 10000mAhr/5A = 2 hours.

    Regards,

    Jeff