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