usb c adapter to usb

Hello OldTimer95,

Thanks for choosing the Apple Support Communities. This would really depend on the wattage rather than connection method. Here is a guide on how to Fast Charge your iPhone.

Fast charge your iPhone - Apple Support

"You can fast charge your iPhone 8 and later up to 50 percent battery in around 30 minutes.1

Fast charging works when you use an Apple USB-C to Lightning cable and one of these adapters:

• Apple 18W, 20W,2 29W, 30W, 35W, 61W, 67W, 87W, or 96W, or 140W USB-C Power Adapter
• A comparable third-party USB-C power adapter that supports USB Power Delivery (USB-PD)

If you're not sure which Apple Power Adapter you have, check the wattage on the top or bottom of the adapter:

1. Testing conducted by Apple in August 2017 using preproduction iPhone X, iPhone 8, and iPhone 8 Plus units and software, and in August 2018 using preproduction iPhone XS, iPhone XS Max, and iPhone XR units and software, with accessory Apple USB-C Power Adapters (18W Model A1720, 29W Model A1540, 30W Model A1882, 61W Model A1718, 87W Model A1719). Testing conducted by Apple in August 2019 using preproduction iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max units and software and accessory Apple USB-C Power Adapters (18W Model A1720, 29W Model A1540, 30W Model A1882, 61W Model A1947, and 87W Model A1719). Testing conducted by Apple in February 2020 using preproduction iPhone SE (2nd generation) units and software and accessory Apple USB-C Power Adapters (18W Model A1720 and 30W Model A1882). Testing conducted by Apple in September 2020 using preproduction iPhone 12, iPhone 12 mini, iPhone 12 Pro, and iPhone 12 Pro Max units and software and accessory Apple USB-C Power Adapter (20W Model A2305). Fast-charge testing conducted with drained iPhone units. Charge time varies with environmental factors; actual results will vary. Testing conducted by Apple in August 2021 using preproduction iPhone 13 mini, iPhone 13, iPhone 13 Pro, and iPhone 13 Pro Max units and software and accessory Apple USB-C Power Adapter (20W Model A2305). Testing conducted by Apple in February 2022 using preproduction iPhone SE (3rd generation) units and software and accessory Apple USB-C Power Adapter (20W Model A2305). Testing conducted by Apple in August 2022 using preproduction iPhone 14, iPhone 14 Plus, iPhone 14 Pro, and iPhone 14 Pro Max units and software and accessory Apple USB-C Power Adapter (20W Model A2305). Fast-charge testing conducted with drained iPhone units. Charge time varies with settings and environmental factors; actual results will vary.

2. You need a 20W or higher power adapter to fast charge your iPhone 12 and later."

We hope this helps.

Cheers!