If you look at the introduction site that Apple released at the same time as the announcement of the new iPhone, you can find a description about the quick charging of the new iPhone. "Built-in rechargeable lithium-ion battery that can charge up to 50% in 30 minutes" (iPhone X specs).
If you follow that note,
Based on test results conducted by Apple in August 2017 using prototype hardware and software for iPhone 8 and iPhone 8 Plus, and Apple USB-C power adapter (29W model A1540, 61W model A1718, 87W model A1719) accessories. The fast charge test was performed using iPhone hardware that was completely battery drained. Charging time will vary depending on environmental conditions and actual results may vary.
It is described as.
What you can see from this is that the quick charge of the new iPhone seems to be a USB PD. That said, the iPhone's connector is still Lightning.
In other words, charging is done using a USB Type-C on one side and a Lightning cable on the other side. If you try to adhere to the standard, it is NG to send PD here. Because USB PD is a standard for USB Type-C (USB PD 3.0).
However, there is a possibility that the cable itself has a built-in PD controller. Lightning --- It's quite possible because it's a company that has a built-in DA converter and analog amplifier in a 3.5 mm headphone jack adapter. In other words, it can be insisted that it complies with the standard forcibly if it is considered as a peripheral device for charging directly attached to the cable instead of the cable.
The genuine "USB-C-Lightning cable" is over 3,000 yen for 1m. It's about 1.5 times the price of a Lightning cable with a USB Type-A connector, so I'd like you to do that much.
