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LM2621: Typical Applications for 5V/0.5A in datasheet outputs 3.6V Vout instead

Jeffry Wicaksana
Prodigy 10 points
Part Number: LM2621

Hi all, 

I followed the typical application example circuit on LM2621 datasheet for 5V/0.5A output, put the design into my PCB and solder them together. However, it outputs 3.6V instead of 5V. I triple-checked that the circuit is the same as the datasheet on the board. 
Is there anyway I can debug the board or do I need to redesign the board because I did not follow the recommended layout given?
Thanks a lot! 
Jeffry Wicaksana