The highest configuration of iPad is to use 22W fast charge, which needs to use Apple's charger, or a charger that supports PD fast charge protocol.
Expansion data: ipad Pro2021 theoretically supports up to 30W PD fast charge; The iPad Pro 12.9-inch version supports up to 35W PD fast charge.
Apple ipad fast charge is generally 20w, there are also different manufacturers of power is larger, but it is not safe, it is best to use the official configuration of fast charge 20w
The current maximum configuration of the iPad is to use 20 watts of fast charge, which is the current iPad2020. Overall, the cost performance is relatively high.