https://www.cnet.com/news/apple-iphone-diaglog-semiconductor-chips-power-management-2018/

Apple may be getting into semiconductors in an even bigger way. 

The company may make its own iPhone power management chips as soon as 2018, according to a report from Nikkei. Currently, Apple relies on supplier Dialog Semiconductor for those processors, which are important for making sure an iPhone charges correctly and doesn't consume too much energy.