I've been working on a buck converter using an MC34063, but the output current is far lower than I need. I want to be able to pull at least 700 ma. I was able to get 70 ma without an external transistor. Yesterday, I set up an external transistor and increased the current to 150 ma. The external transistor I used is a TIP116. I was wondering if having another TIP116 would help to increase the current output more. Basically making a darlington transistor using darlington transistors. I apologize if this question seems a bit ridiculous, but I have very little experience with amplifiers. I have op amps aswell, but I'm not sure if they are what I should use. Thanks.