The LM4666 is a fully integrated single-supply high efficiencyswitching audio amplifier. It features an innovative modulatorthat eliminates the LC output filter used with typical switchingamplifiers. Eliminating the output filter reduces parts count,simplifies circuit design, and reduces board area. TheLM4666 processes analog inputs with a delta-sigma modulationtechnique that lowers output noise and THD whencompared to conventional pulse width modulators.The LM4666 is designed to meet the demands of mobilephones and other portable communication devices. Operatingon a single 3V supply, it is capable of driving 8Ω transducerloads at a continuous average output of 450mW withless than 1%THD+N. Its flexible power supply requirementsallow operation from 2.8V to 5.5V.
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