The Marvel Studios head said that there are many more stories to tell about Tony Stark in film.
He praised actor Robert Downey Jr, adding that Iron Man 3 was heavily influenced by the events of The Avengers.
"Robert Downey Jr. gave his all to this performance," Feige told MTV. "He left no stone unturned.
"So much of the journey of Iron Man 3 is informed by Tony's experiences in The Avengers.
"It's almost like post-traumatic stress: he really has retreated after the events of The Avengers into his workshop, where he's building advanced versions of his suits. He has [designed] a version of the suit that can latch onto him in individual pieces... anytime, anywhere.
"As he starts to realise, it's basically because he doesn't want to be out of the suit: he's seen a lot of things in Avengers and has encountered a lot of powerful people, much more powerful than he is.
"Characters like James Bond and Batman, whose stories go on and on and on - I think Tony is one of those characters, where we go directly after Iron Man 3.
"I'm not looking too far ahead. I'm looking to finish Iron Man 3, getting into Avengers 2, and then seeing where we go from there. But I do think we have more Tony Stark tales to tell, and we'll take it one movie - or maybe two movies - at a time."
He also had praise for director Shane Black, who was also involved in the previous films.
"No-one has been shy - myself, Robert and [Iron Man director Jon] Favreau - about how Shane worked in the shadows of the first Iron Man film, helping with certain scenes and helping with tonal things," said Feige.
"This film, it's much less the culmination of the previous Iron Man movies in part three: this is Iron Man: A Shane Black Film. That, to me, is by far the most unique thing about this movie."
Iron Man 3 will debut on April 26 in the UK and May 3 in the US. Watch a trailer for the film below: