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TPS2511 iphone 5 charging

Hope Johnson
Prodigy 85 points
Other Parts Discussed in Thread: TPS2511

Has anyone had success in using the TPS2511 in charging an iphone 5?  Although the iphone 5 is supposedly BCS 1.2 compliant, and I've been able to successfully charge an iphone 3, when I try to connect an iphone 5 I get the 'charging with this device is not supported' error message.  I am charging in the 5W mode, meaning the DM (pin 7) is connected to D+ on the USB port, and DP (pin 6) is connected to D-. Any suggestions would be appreciated.

Thanks!

  • 0
    TI__Intellectual 2795 points

    Hi Hope,

    First please help check my understanding your question:   iPhone3 plug in TPS2511 is ok, plug in iPhone5, display "'charging with this device is not supported' on the screen and What's the voltage at this moments on D+/D-, if set TPS2511 to 5W mode, iPhone5 works good, right?  Acctually, we have tested one pc iPhone5 in our Lab, it looks work good with TPS2511.

  • 0 in reply to Milo Zhu
    Prodigy 85 points

    Hi Milo,

    Thanks for your response.  To clarify, I have not been able to get the iphone 5 to charge at all--it does not work in 5W mode.  Initially, it acts like it's charging (displays the charging battery), but within a second, switches to the 'charging with this device is not supported' error. 

    The voltage I read on the pins is as follows: 

    #1  4.70V

    #2(D-)  2.26V

    #3(D+) 1.66V. 

    These seem to be significantly lower than the 5.0V/2.7V/2.0V specs.  Perhaps the loss resistance is higher with the iphone 5 and I need to adjust the voltage drop compensation(TPS2511 pin #4) differently?  Can I ask how you've set this to get the iphone5 charging?

  • 0 in reply to Hope Johnson
    TI__Intellectual 2795 points

    Sorry for the dealy.

     Our TPS2511 integrated D+=2.7V/D-=2.0V charging spec that it is backward compatible. My test is based on TPS2511EVM, charging looks good, change DC-Power Supply just affect the  charging current.