Up to how many volts, watts and amperage does the iPhone X support from a charger?

Hi all,

I recently bought a powerbank that supports USB-C PD with a maximum of 20V-3A (60 Watts) as the powerbank's output and was wondering what is the max input rating of the iPhone X when it comes to volts, watts and amperage. I also intend to use a USB C-to-Lightening cable between my iPhone X or iPhone XS Max and the powerbank that supports 20V-3A (60 Watts) through its USB-C PD port.

I don't want to risk frying out my iPhone X if its max input rating supports less than 30W or 3 amps, which is why I haven't plugged it into either my X or XS Max iPhones.

Will I cause any damage to my iPhones if I use this powerbank?

Thank you in advance,

Jan D.