Before revision: According to PocketNow, Quick Charge 3.0 starts at 3.2 volts with 0.2 volts between each step (3.2 V, 3.4 V, 4.6 V, …, 19.8 V, 20 URL Pump Express Plus — MediaTek Technology White Paper (April 2015)
After revision: and goes up to 20 VThe site "powerbankexpert.com" claims that the protocol has a minimum voltage of 3.6 Volts.According to PocketNow, Quick Charge 3.0 starts at 3.2 volts with 0.2 volts between each step (3.2 V, 3.4 V, 4.6 V, …, 19.8 V, 20 URL Pump Express Plus — MediaTek Technology White Paper (April 2015)