PMP9751, Battery Runtime Extension for GSM High Power Applications Reference Design. In this Reference Design, the TPS61280 Boost Converter with integrated Bypass Switch powers a Radio Frequency Power Amplifier (RFPA) in GSM Mode. The TPS61280 RFPA Combo Board enables longer battery runtime by applying a user defined minimum supply voltage for a Radio Frequency system. The whole board features a pre-developed and tested RF compliant power application