This is a very popular USB to UART Convert Chip in QFN-28 package from Silabs.
The high-performance, low cost CP2102 USB to UART bridge offers a complete plug and play interface solution that includes royalty-free driver suites and a comprehensive design ecosystem that enables customers to speed time-to-market. Crystal-less operation, in-system programming memory and small body size packages reduce cost, simplify design and shorten development time.
We find CP2102 chip to be more reliable as compared to FTDI's FT232R.