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

Voltage levels:

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?
  • \$\begingroup\$ You're confusing system standard (Quick-Charge) specifications with what actual devices can do. That's like saying that you can legally drive 400 km/h and finding it contradicting that a VW Golf's datasheet says it won't go any faster than 220 km/h. \$\endgroup\$ – Marcus Müller Jan 25 at 12:09
  • \$\begingroup\$ If the protocol defined numerous stepped levels of voltages and the device offers only three, how come does it even follow the standard? \$\endgroup\$ – Holmes.Sherlock Jan 25 at 12:13
  • \$\begingroup\$ Also, Wikipedia and Belkin disagree in max/min current, voltage and power ratings as well \$\endgroup\$ – Holmes.Sherlock Jan 25 at 12:14
  • \$\begingroup\$ Because the standard allows that. It's absolutely common for standards to specify "does one or multiple of the following things". \$\endgroup\$ – Marcus Müller Jan 25 at 12:15
  • 1
    \$\begingroup\$ Wikipedia is a random collection of things people wrote down and not an original source. If the original source isn't given in wikipedia, then that would be a case for [citation needed]. Wikipedia is NEVER an original source of information. Wikipedia explicitly forbids adding original information. Belkin doesn't write standards, they produce products, see my first comment. \$\endgroup\$ – Marcus Müller Jan 25 at 12:16

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