Hello,
The information provided is too general, thus I could not find a suitable part that fits those markings. Could you provide a photo which clearly shows the top marking? That may be able to give some better information. Is there any additional information you can provide such as what the input voltage and output voltage is? That can also help narrow down the search.
You can also reference our product package information, which can be found here:
Package Information - Support (monolithicpower.com)