Understanding USB-C Charging

USB-C is a connector. Charging speed still depends on PD, PPS, the cable, and the phone.

USB-C describes the port shape. It does not mean every USB-C charger is the same.

Connector: USB-C vs USB-A vs Lightning.
Protocol: USB PD, PPS, or older USB-A charging.
Cable: e-marked high-wattage USB-C cables vs thin charge-only leads.
Phone limit: the device’s own maximum wired wattage.

Lightning iPhones need a USB-C PD charger plus a USB-C to Lightning cable (or a USB-C iPhone with a USB-C cable). USB-A to Lightning will not provide the same PD handshake.