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.
The LM4666 has high efficiency with an 8Ω transducer load compared to a typical Class AB
amplifier. With a 3V supply, the IC's efficiency for a 100mW power level is 79%, reaching 84% at
450mW output power.
The LM4666 features a low-power consumption shutdown mode. Shutdown may be enabled by
driving the Shutdown pin to a logic low (GND).
The LM4666 has fixed selectable gain of either 6dB or 12dB. The LM4666 has short circuit
protection against a short from the outputs to VDD or GND.
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