The SSM2377 is a fully integrated, high efficiency, Class-D audio amplifier. It is designed to maximize performance for mobile phone applications. The application circuit requires a minimum of external components and operates from a single 2.5V to 5.5V supply. It is capable of delivering 2.5W of continuous output power with <1% THD + N driving a 4ohm load from a 5V supply. The SSM2377 features a high efficiency, low noise modulation scheme that requires no external LC output filters. The modulation operates with high efficiency even at low output power.