The RF power Amplifier has been packed in VQFN for convenient overseas shipping.If the supply current is operated in the range of 17mA or higher, it will provide its performance.
ATR4251-PFPY19 Features
ATR4251-PFPY19 Applications
There are a lot of Atmel (Microchip Technology) ATR4251-PFPY19 RF Amplifiers applications.