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Bring on full USB-PD – U stands for Universal!

The rest of the Android and PC world use USB Power delivery standards

an iPhone fast charge

In short, you can use any USB-PD compatible charger on any USB-C PD compatible device. The larger the charger voltage and amperage, the faster the battery will charge – within the pre-defined intelligent limits set by the device and communicated by a handshake protocol between the device and the charger.

USB-PD delivers up to (maximum) 5V/3A, 9V/3A, 15V/4A and 20V/5A.

USB Power Delivery Specification

  • Self-powered devices (using the USB 2.0 host or later) from 100mA-900mA, e.g. USB-A ports
  • 1.0 is 5V up to 1.5A, e.g. 7.5W
  • 2.0 is 5V up to 3A (15W) and voltages in between to a maximum of 20V/3A (60W)
  • 3.0 is 5V up to 3A (15W) and voltages in between to a maximum of 20V/5A (100W)

Some chargers may support more than 100W for a specific device but if used on any other USB-PD compatible device default back to PD 3.0.

Smartphone fast charging types

OPPO VOOC uses two 5V/2A chargers (in one 20W) for two batteries with two power channels and a special USB cable. So, in this way it safely achieves its fast charge, not overstressing the batteries.

Qualcomm Quick Charge 1/2/3/4/+ is intelligent charging

  • 1.0 is 5V/2A (10W)
  • 2.0 is 5V/3A, 9/2A, 12V/1.67A (18W)
  • 3.0 is 3.6V to 20V dynamic 200mv increments (18W)
  • 4.0 is as per 3.0 but with USB-PD fully implemented to 18W. Typically used for Snapdragon 630/660/710/835
  • 4+ in 3V to 11V in 20mV steps and 0 to 3A in 50mA steps as well as USB-PD to 27W. This ‘programmable power supply’ is designed for later Snapdragon processors typically the 67X, 712/730 and 845/855

Huawei implements a version of USB-PD for its Kirin 980 chip. It is currently a 22.5W charger, and there is a 10V/4A 40W SuperCharger for select models (uses a mix of USB-PD and VOOC dual battery).

an iPhone fast charge

Samsung currently supports 15W (9V/1.47A), but it is looking to 50W for the Note10 and later. If this happens, we will see a 100% charge in 30 minutes.

GadgetGuy’s take: The Apple 5W charger is inadequate for iPhone 8 or later

Sure, it charges the phone – very slowly – and its small size is convenient.

For a few dollars, more Apple could have included a 12 or 18W charger and made iPhone 8 or later users very happy.

an iPhone fast charge