Docking station for an iphone

The lightning connection coupled with a usb hub will work for an iphone as well.

One product that may be of interest is the "Shift" from Peachtree Audio. It is a portable battery powered usb dac that will also charge your phone. Apparently it was designed specifically for iphones.

http://www.peachtreeaudio.com/shift.html

So use lightning adapter with USB cable to powered USB hub with USB cable to DAC.  I have a Doukmall USB cable that separates USB power from audio signal which might also work in place of the hub.

I will likely be trying the apple camera adapter and powered sub hub sometime soon.   

As long as your device see's it as being self powered you should be fine. When I researched this about a year ago I found this blog which has some good info.

http://blog.jdslabs.com/?p=838