PCB layout buck converter
I see a few issues on this design. In step-down converters you have 3 pins that carry all of the current, and those are VIN, GND and LX. These are the pins to which you must give the priority in terms of track width and length.

Looking at the design you show, you have not followed any of these rules. 
I suggest you make sure that all components on LX are as close as possible to the pin, taking priority on the diode and inductor. the output capacitor doesn't need to be that close, but the input capacitor should.

Try to make the GND track nice and wide, giving priority to the GND path between the MAX5033 to the diode and the input capacitor.

In theory a 0.5mm track should be enough in all cases, but for the tracks mentioned above, the wider is better, as it will lower the impedance, and reduce any noise that might bite you  later.

It is worth looking at the app notes on Maxim's website such as https://www.maximintegrated.com/en/app-notes/index.mvp/id/4381
The layout they have done here is not optimal, but the designer here had space constrains, so had to compromise, but it is a good start.