iOttie Automotive Wireless Charger - No +5V on one output

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  • fuxxy
    Badcaps Veteran
    • Jan 2013
    • 318
    • USA
    #1

    iOttie Automotive Wireless Charger - No +5V on one output

    Hello everyone!

    I purchased an iOttie Wireless charger. Listed on Amazon as "iOttie Easy One Touch Wireless Qi Fast Charge Car Mount Kit"

    This windshield mount has a 12V Cigarette Lighter adapter, with a MicroUSB cord permanently attached, as well as a USB Type A jack.

    I am hardwiring this into the car, so I removed the USB Jack and Cigarette Lighter terminals. I now have a bare circuit board with wires soldered in place for +12V input, and only the MicroUSB wire re-soldered to the original location.

    I am not getting +5V out of the original cable. I am getting +5V to the old USB Type A jack header.

    I assumed these chargers would use a common +5V vOUT, so I've searched for signal paths that would have been broken with the USB socket removed, but I couldnt find any. The signal path is unbroken from the +5v pad all the way to the nearest IC.

    Why could the charger only be outputting voltage on ONE of the outlets, but not the other?

    EDIT: Images Uploaded. Inductors L1 & L2 were removed for picture for PCB clarity.
    Attached Files
    Last edited by fuxxy; 07-01-2019, 12:14 PM.
    Tags: None
    • fuxxy
      Badcaps Veteran
      • Jan 2013
      • 318
      • USA
      #2
      Re: iOttie Automotive Wireless Charger - No +5V on one output

      U1 is HC2008 - "3.1A car charger IC"
      U2 is HC2807 - "DC-DC step-down converter"
      U3 is unknown, package marked FT4dLK, pins connect to the D+/D- pads

      All of these are chinese IC's, I can't find any datasheets.
      Last edited by fuxxy; 07-01-2019, 01:45 PM.

        Comment

        • R_J
          Badcaps Legend
          • Jun 2012
          • 9583
          • Canada
          #3
          Re: iOttie Automotive Wireless Charger - No +5V on one output

          U3 could be a FP6601Q
          It could be that the charger requires a device connected before you will see any voltage

            Comment

            • fuxxy
              Badcaps Veteran
              • Jan 2013
              • 318
              • USA
              #4
              Re: iOttie Automotive Wireless Charger - No +5V on one output

              The pin assignments of FP6601Q and PL2733A *SEEM* pin-compatible with the circuit on my board.

              According to the example circuit in the FP6601Q datasheet, the USB port controller gets VCC from the output of the upstream buck controller. This would require the voltage divider on the buck controller to output *some* sort of voltage, even when not connected. I wonder if I could identify the resistors of the voltage divider, replace them with 470k/150k and see if the buck controller will output the datasheet-advertised 1.21V

                Comment

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