Hello!
I have just sifted through 38 pages on Mouser, trying to find a current-mode pwm controller, capable of running from 3 to 6V, unfortunately unsuccessfully.
What I am aiming for is a battery powered (4xAA alkaline) boost converter, just couple of W, but rather higher voltage, than usually available chips --> hence external mosfet required.
The closest I came around was MCP1632, unfortunately, 6V absolute maximum is I think not safe for use with 4 AA cells. (something like UC3843, however for <4V operational voltage would be sooo nice!). Am I asking for just too much?

Thank you for any suggestions! Cheaper the better!