Noise on the FB pin is a common problem with poor layout, hence asking for a 
look at it.

You should not need any other bypass caps if the layout is good and the 
component choice likewise.

Nick

On 15 July 2016 22:01:39 BST, gregebert <gregeb...@hotmail.com> wrote:
>Although the supply is behaving like it's under-loaded, there could be 
>another culprit: noise.
>
>I've looked at the schematic, and it's possible that the PCB layout
>could 
>be injecting excess noise into the MAX1771. Is the bypass cap C3
>located as 
>close to the 1771 as possible ?  I think C4 should be close to the 
>inductor. Be sure to check the power supply pins of the 1771 with your 
>scope.
>
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