What is QC 3.0 Fast Charging? How fast charge 3.0 protocol works

When using QC3.0, the portable device submits a voltage selection request through the D+ and D- signals of the USB interface, and there may be irregular USB data communication at the same time.

QC3.0 is equivalent to QC2.0 in discrete mode, with 0V, 0.6V, 3.3V three-level logic to select VBUS through static D+/D- values; in continuous mode, the new QC3.0 increases in small steps of 200mV Or reduce VBUS to allow portable devices to choose the most suitable voltage to achieve the ideal charging efficiency, which is more flexible. The maximum load current is limited to 3A, and the maximum power can reach 60W.