NXP IPO prices 28 pct below midpoint -- source

NEW YORK Aug 5 (Reuters) - Dutch chipmaker NXP Semiconductors NV (NXPI.O), the first of the four big private equity-backed IPOs in the U.S. pipeline, priced shares in its stock floatation more than 28 percent below the midpoint of the expected range, according to an underwriter.

The company sold 34 million shares for $14 each, raising about $476 million. It had planned to sell shares for $18 to $21 each. (Reporting by Clare Baldwin; editing by Andre Grenon)