PE-backed Dunkin' Brands Group has set the terms of its IPO. The 22.25 million shares of common stock in the offering are expected to price between $16 and $18 apiece. If the company prices at the middle of its expected range, the offering would raise $378.25 million. Dunkin' Brands, which is backed by Bain Capital, The Carlyle Group and Thomas H. Lee Partners, operates and franchises quick service restaurants under the Dunkin' Donuts and Baskin-Robbins brands. The company intends to list on the NASDAQ under the symbol DNKN.