The two unnamed chips in Step 17 are confirmed by Chipworks to be from Dialog Semiconductor: 343S00025-A1 and 343S00052-A1 are Dialog chips D2231A and D2257A respectively, based on the die markings on their photos.

The D2231A is probably the fast charging chip. Apple might introduce it for the iPhone - fast charging would be a great function to have (lets see if the rumoured smaller iPhone will have it in March next year).

Can send images from Chipworks if needed.

Can send the images from Chipworks as proof.