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Is bq51013A 5W or 7.5W capable?

kyle sweet
Prodigy 105 points
Other Parts Discussed in Thread: BQ51013A

Hello,


bq51013A claims to have outputs of 5V/1.5A which is 7.5W.  But the web site classifies this as a "5W" receiver.  Can someone please explain this discrepancy to me?

Is it ok if I'm configured to draw 1.5A @ 5V on this receiver which is driven by a bq500212AEVM?

  • 0
    TI__Genius 14890 points

    Kyle,

    The bq51013A is a 5W receiver.  This means that the system can deliver 5W to it's output reliably.  In order to provide 5W at 1A, operational margin is added to ensure full compliance to the WPC 5W requirements.  When setting IMAX (expected operating current) to the maximum recommended 1A (to achieve 5W) the current limit is set to 20% over that value.  This takes into account any inrush currents, transitional currents and other short term surges.  

    Note 1.5A is the absolute maximum. See note 2 in the Absolute Maximum Ratings table.

    The transmitter is configured to allow the system to supply 5W at the output.  This means the transmitter must supply more than 5W to allow for losses in the system.  To supply 7.5W at the output would require the transmitter to provide 7.5W plus account for all losses.

    The system is tested to work at 5W on the output of the bq51013A.  It is not tested beyond that.

    Regards,

    Dick