The LM4670 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 external component count, simplifies
circuit design, and reduces board area. The LM4670 processes analog inputs with a delta-sigma
modulation technique that lowers output noise and THD when compared to conventional pulse width
The LM4670 is designed to meet the demands of mobile phones and other portable
communication devices. Operating on a single 5V supply, it is capable of driving a 4Ω speaker load
at a continuous average output of 2.3W with less than 1% THD+N. Its flexible power supply
requirements allow operation from 2.4V to 5.5V.
The LM4670 has high efficiency with speaker loads compared to a typical Class AB
amplifier. With a 3.6V supply driving an 8Ω speaker, the IC's efficiency for a 100mW power level is
77%, reaching 88% at 600mW output power.
The LM4670 features a low-power consumption shutdown mode. Shutdown may be enabled by
driving the Shutdown pin to a logic low (GND).
The gain of the LM4670 is externally configurable which allows independent gain control
from multiple sources by summing the signals.
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