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BQ25792: BQ25792

Shafeeq Muhammed
Expert 1170 points
Part Number: BQ25792
Other Parts Discussed in Thread: TIDA-050047

Hi,

We are planning to use BQ25792 in our new design.

I would like to know that whether we can use this module with an DC supply of 12V-24V instead of VBUS option from USB connector?
So there will be no D+/D- signals as there is no USB option.

As per the datasheet section 8.3.4 Device Power Up from Input Source, the charger performs D+/D- detection and after that only will start charging or switch power to SYS.
But as per the reference design TIDA-050047, the D+ and D- pins are NC.

  • Can I keep the D+ and D- as NC and use the charger without D+/D- detection?

Also as per the reference design TIDA-050047, that you are claiming that the design is able to sink 100W.
But as per the datasheet if the BQ25792, the recommended maximum IVBUS is 3.3A.
As per the Type-C power Delivery, 100W is achieved by 5A @20V.
  • I want to know whether BQ25792 can support input current (IVBUS) more than 3.3A.
  • Also please suggest what is the maximum output current that charger can provides through Pin SYS either from battery or VBUS
Thanks & Regards,
Shafeeq
  • 0
    TI__Guru*** 143870 points

    HI Shafeeq,

    Yes, you can leave D+/D- floating and use 12V to 24V input power source.  The charger will report unidentified input power source and set input current limit 3A.

    The maximum input current for BQ25792 is 3.3A.  The maximum continuous output current from the converter in forward (charge) mode (ISYS+IBAT) is 5A.  The maximum continuous current from BAT to VBUS in reverse (OTG) mode is 3.3A.

    Both of the above currents are assuming that the IC does not enter thermal regulation.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Expert 1170 points

    Hi Jeff,

    Thanks for your reply.

    As per your reply, the charger will report unidentified adaptor and input current limit will set to 3A.

    Is it possible to set the input limit to maximum (3.3A) after that?

    Please confirm whether the output current that you referred is current on the pin SYS.

    Thanks and Regards,
    Shafeeq

  • 0 in reply to Shafeeq Muhammed
    TI__Guru*** 143870 points

    Hi Shafeeq,

    Yes, you can change the input current to 3.3A after startup.  You will also want to either size the ILIM resistor 3.3A or disable the ILIM input current clamp in I2C.

    Yes, 5A is the maximum output current from SW to SYS+BAT, with SYS being prioritized.

    Regards,

    Jeff