The LM4673SD is a single supply high efficiency mono class D Audio Amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, board area consumption and simplifying design. The LM4673 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 4R speaker load at a continuous average output of 2.1W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4 to 5.5V. The LM4673 has high efficiency with speaker loads compared to a typical class AB amplifier. With a 3.6V supply driving a 8R speaker, the IC's efficiency for a 100mW power level is 80%, reaching 88% at 400mW output power. The LM4673 features a low-power consumption shutdown mode. Shutdown may be enabled by driving the shutdown pin to a logic low (GND).
No output filter required for inductive loads
Externally configurable gain
Minimum external components
Click and pop suppression circuitry
Micro-power shutdown mode
17μs (typical) Very fast turn on time
0.01μA (typical) Total shutdown power supply current
(EN)
