The previous post (from 2013) had what you should search for: "Texas Instruments TPS2064DGN". A search will bring up numerous companies that sell this part. If you are in the US, Mouser sells this. I have bought from Mouser in the past and they're a good company. The shipping will probably cost more than the part, though. The link below has a lot of information on this part, including the datasheet.
Thanks Treekram, searching on TExas Instruments Marking Conventions I found that first line in package is the logo and date code, and second line is for the Device part number.
At the begining of my quest I was desoriented cause this two numbers in first line , right side of the logo.
So it seems to be that numbers in first line are not relevants.