Out of many fast charging protocols, Qualcomm quick-charge 1.0/2.0/3.0/4.0/4+ is a prominent one. I tried to find the specification of quick-charge 3.0 protocol.
However, the material spread across the Internet is conflicting and confusing.
Disagreement in max voltage, current, power:
- Wikipedia: Max current: 2.6A or 4.6A, Max power: 18W (9V*2A), Voltage: 3.6V-20V, dynamic with 200 mV increments
- Belkin: Max current: 2A or 3A, Max power: 36W, Voltage: 3.6V-12V
- Qualcomm: Max current: 2.6A or 4.6A, Max voltage: 22V
Android Authority says,
The major new feature with 3.0 is INOV (Intelligent Negotiation for Optimum Voltage), which allows for a fined tuned power output and a more optimized charging cycle. Firstly, different batteries require different charging voltages. Version 2.0 supported four modes at varying power levels, 5 volts/2amps, 9V/2A, 12V/1.67A, and a 20 volt option. Quick Charge 3.0’s INOV communicates with the device to request any voltage between 3.2V and 20V at 200mV increments, allowing for a wider selection of voltages.
The above sounds like there are numerous voltage levels supported in steps of 200mV between 3.2V and 20V. However, the specification of Mi India Standard Charger (MDY-08-EW), which is a Qualcomm quick-charge 3.0 certified charger, speaks something else:
Output current: DC 5V=3A / 9V=2A / 12V=1.5A
It seems like the voltage levels are fixed, just like quick-charge 2.0 standard.
My questions/confusions regarding quick-charge 3.0 are:
- Where do I get official Qualcomm quick-charge 3.0 standard specification?
- Are the voltage levels fixed or stepped in 200mV?
- What are corresponding current and power ratings?