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A buck converter with a QC 3.0 compatible output
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QC3.0 board

see the article here. Also available on Tindie. A picture of the finished device

Board with a switching buck converter and a QC 3.0 class-A chip (it also supports FastCharge, DCP, and others).


  • HiSilicon Fast Charging Protocol (FCP), ie Huawei phones (tested)
  • Qualcomm Quick Charge 2.0/3.0 Class A: up to 12 V Output Voltage (tested)
  • USB DCP (shorting D+ Line to D-) per USB Battery Charging Specification, Revision 1.2 (tested)
  • USB DCP (applying 2.7V on D+ Line and 2.7V on D- Line), ie Apple 12 W
  • USB DCP (applying 1.2V on D+ and D- Lines)
  • Chinese Telecommunication Industrial Standard YD/T 1591-2009 (whatever that is, I have not tested that)


  • input voltage: 6 - 15 V, recommended 12 - 15 V
  • input current: max 2 A
  • output current: max 2 A
  • efficiency (Vin = 12 V, Vout = 5 V, Iout = 1 A): 95 %
  • efficiency (Vin = 12 V, Vout = 5 V, Iout = 2 A): 92 %
  • quiescent current (no load connected, Vin = 12 V): 800 µA
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