iPad Pro 3rd Gen charging at 5V 3.3A possible?

Per my reply to you yesterday in a different thread...

There are two different fast-charging standards - QC (Quick Charge) and PD (Power Delivery). Where supported by a device, it will support one or other fast-charge standard - but not both.

PD is a multi-voltage standard. At initial connection, the protocol will negotiate the highest common charge rate/voltage supported by both charger and connected device; if PD cannot be negotiated, the charger will fall-back to 5V - at whatever current that it can provide.

Apple iPad and iPhone do not support QC - but, for models that support fast-charging, they support PD up to 18W.

In conclusion, as QC is not supported by Apple, your QC fast-charger will do little to improve the standard charge rate of the Apple device - these typically topping-out at about 2.4A @5V.

I hope this information is helpful in clarifying the supported specifications of your Apple devices - and the observed behaviour.

Well, depending upon where you internally “tapped” your charger, this being a switched-mode supply, you might not be measuring the USB bus voltage and current - but may instead be measuring values prior to the voltage regulator.

As for taking measurement of the USB bus itself, if you are utilising a calibrated USB Bus Analyser, then you may be reading true values. However, in absence of a fault, I remain sceptical that the iPad will draw 3.3A @5V - as this would also require a very substantial (and potentially non-standard) USB cable.

Have you paused to consider that be connecting an external charger of incompatible specification, that you may have caused damage to the internal electronics of the iPad? If nothing else, you will almost certainly have invalidated any residual warranty.

Perhaps I was not clear in my statement. iPad is designed to work with Apple's USB Power Adapter. iPad only supports a power draw of 2.0A. It's physical circuitry does not support larger amp power adapters.

I have merely stated the technical outline specifications of PD and QC systems - and the iPad.

If your iPad’s measured charge rate is indeed 3.3A @5V, then perhaps you have a fault. I would venture to ask how you are measuring the voltage/current being dissipated by your iPad?

Hello,

Apple's USB-C Power Adapters have a power draw of 2.0A. iPad does not supports 2.4A at this time.