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Choosing a switch-mode regulator for smallest footprint and wide working input voltage range

Other Parts Discussed in Thread: LMR14203, TPS62177, LMR14006

I need a regulator to supply up to 300mA @3.3 volts with an input voltage that can vary from 9 to 30 volts, with as  small a footprint as possible for the complete design. The LMR14203 looked attractive but when the design is run through WEBENCH, it says that it can't do the minimum Ton required.

What is my best option for this design ?

Thanks,

Geoff