The PS4 controller takes in 5V 0.8A. The USB port on the PS4 is 5V 0.9A which is ok for the controller. I use a 5V 0.55A charger (for an old folding cellphone) and it charges correctly the controller. I tried twice to charge the PS4 controller with an iPhone white block wall to USB charger, which is 5V 1A, and both times I had troubles. I read here and there that the controller of some people are fine with 5V 1A and even 5V 2.4A chargers, lucky them. It happens that my controller does not seem to like higher amp than 0.9A. So, for my controller it seems that a 5V charger between 0.55A and 0.9A is what it likes. If your controller is as capricious, then you should go for a charger between 0.55A and 0.9A and the iPhone 5V 1A charger will not work. I hope this helps. In the end, I am still very intrigued by the fact that some people are fine with >0.9A while mine is not fine with >0.9A. In any case, this is very confusing.