The Apple 11-inch iPad Pro (2018) came with its own 18 watts based USB Type-C charger since the iPad now has a USB Type-C instead of the Lightning connector. Let's see how much power the iPad can draw from the third party AUKEY PA-Y12 Amp 60W PD 3.0 USB-C Wall Charger which offers up to 60W charging using USB Power Delivery 3.0 over USB Type-C.
When both the iPad and Aukey charger were connected over the USB Type-C to Type-C cable that shipped with the iPad, we could immediately see initial voltage of about 5 volts with a quick peak of about 1 amps current. Note the iPad was 32% charged at plugin. This was then followed by almost no current being pulled as the voltage ramped up to a 15 volts rail. At this point the iPad only began pulling current to initiate charging with the Aukey charger. The iPad then progressively pulled higher current to max out charging at about 37.5 watts (15 volts @ 2.5 amps) before settling at around 30 watts (15 volts @ 2 amps) of steady state charging. To view more details, click here to download the trace captured by the GRL-A1 power analyzer.
Using the AUKEY PA-Y12 Amp 60W PD 3.0 USB-C Wall Charger, the Apple 11-inch iPad Pro (2018) can get almost twice the power of that offered by its own given Apple 18W USB-C charger to be able to charge more quickly.