The ipad4 supports 18W fast charge
Apple's new 20W PD fast charger is a continuation of the appearance of 18W fast charger. Support 100-240V to 50\/60Hz 0.5A input, and 5V\/3A, 9V\/2.22A output.
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At the same time, magnesium core Micro Technology recently launched a complete program of 20W power PD fast charger, PD3.0 certification chip HUSB339B, and has achieved mass production, suitable for 20W PD travel charging and car charging applications. HUSB339B meets the MFi PD certification standard
The iPad4 supports 10w of charging power and does not support fast charging.
iPad4 can be charged with 20w fast, as long as it is an official charger can be, but not necessarily support so efficient charging, try to use the original charger can protect the iPad