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BQ24392: about Vbus Recommended Operating Conditions

Tsukui Yusuke
Guru 21930 points
Part Number: BQ24392

Hi,

Could you  reflect the test condition voltage(4.5V～5.5V) to the recommended operating voltage in datasheet.
Customer thinks that the recommended operation Vbus voltage and test condition should be the same value.

For example,
FSA832 matches the Vbus recommended operating voltage and the test condition voltage.


Best Regards,
Yusuke/Japan Disty

  • 0
    TI__Guru 64326 points

    Yusuke,

    The recommended vVbus range is based on the USB 2.0 spec. The test condition was used to cover the boundaries of this range. Can you describe the customer application, is the customer trying to use Vbus as Vcc (direct device power) instead of traditional Vbus from USB connector?

  • 0 in reply to Malik Barton57
    Guru 21930 points

    Malik-san,

    Thanks for your support.

    Would you take a consideration about changing Vbus recommend

    voltage from (4.75V to 5.25V) to (4.5V to 5.5V)?

    Because  customer is worrying if the Vbus supply voltage was 4.75V case,

    BQ24392 input voltage will violate the recommend specification because there is voltage drop

    on the cable even small one.

    But 4.75V Vbus out is in spec for former device.

     

    In addition to this, competitor’s pin compatible device supports from 4 to 6V,

    Customer is going to change device from onther device (”FSA832”).


    Best Regards,
    Yusuke/Japan Disty

  • 0 in reply to Tsukui Yusuke
    TI__Guru 64326 points

    Yusuke,

    We cannot change the recommended Vbus range for this device. Electrically BQ24392 is guaranteed from 4.5 and 5.5 V  however the functional characteristics are not. If Vbus is dropping below 4.75V this is outside USB 2.0 Spec and should be inside the 4.75 to 5.25 V range. I recommend getting Vbus into this range.