https://wccftech.com/iphone-12-mini-magsafe-charging-limited-12w/

The iPhone 12 mini might sport the same 5nm A14 Bionic and the same Lightning port as the remaining members of the iPhone 12 series, but it’s not just the compact form fact of the 5.4-inch handset that separates it from the rest of the models. It’s also the maximum wattage support when connected via MagSafe. In a recently updated support document, the iPhone 12 mini will only support up to 12W peak power delivery when being topped up using a MagSafe Charger.

According to the support documentation, the iPhone 12 mini will only support 12W of charging through a USB-C Power Delivery adapter that is rated at the 9V/2.03A specifications. Then again, Apple’s support document also mentions that the maximum supported wattage will depend on other factors, with the details mentioned below.