The LM4666 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
LM4666 processes analog inputs with a delta-sigma modulation
technique that lowers output noise and THD when
compared to conventional pulse width modulators.
The LM4666 is designed to meet the demands of mobile
phones and other portable communication devices. Operating
on a single 3V supply, it is capable of driving 8Ω transducer
loads at a continuous average output of 450mW with
less than 1%THD+N. Its flexible power supply requirements
allow operation from 2.8V to 5.5V.