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My question is related to LMR61428 IC constant voltage output at low input voltage.

Other Parts Discussed in Thread: LMR61428, LMR61428XMMEVM

Sir I purchased  LMR61428 IC and LMR61428 Evaluation Module LMR61428XMMEVM , When I assembled the  LMR61428 IC  Circuit on PCB I am getting Vout ==3.3 times of Vinput.

But in Evaluation module I am getting  constant  5volt  output for input voltage range 2 to 4 volt. I have used circuit in assemble that have  mentioned in the datasheet of IC applications on page no.2 

Please tell me what changes i have to do in my PCB so that it work like LMR61428 Evaluation Module.