LM4667
Description
The LM4667 is a fully integrated single-supply high efficiency switching audio amplifier. It features an innovative modulator that eliminates the LC output filter used with typical switching amplifiers. Eliminating the output filter reduces parts count, simplifies circuit design, and reduces board area. The LM4667 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when pared to conventional pulse width modulators. The LM4667 is designed to meet the demands of mobile phones and other portable munication devices. Operating on a single 3V supply, it is capable of driving 8Ω transducer loads at a continuous average output of 450m W with less than 1%THD+N. Its flexible power supply requirements allow operation from 2.7V to 5.5V. The LM4667 has high efficiency with an 8Ω transducer load pared to a typical Class AB amplifier. With a 3V supply, the IC’s efficiency for a 100m W power level is 74%, reaching 84% at 450m W output power. The...
