View lm4673 datasheet:

December 2005 LM4673 Filterless, 2.65W, Mono, Class D Audio Power Amplifier General Description Key Specifications The LM4673 is a single supply, high efficiency, 2.65W, mono, j Efficiency at 3.6V, 400mW into 8Ω speaker 88% (typ) Class D audio amplifier. A low noise, filterless PWM archi- j Efficiency at 3.6V, 100mW into 8Ω speaker 80% (typ) tecture eliminates the output filter, reducing external compo- nent count, board area consumption, system cost, and sim- j Efficiency at 5V, 1W into 8Ω speaker 86% (typ) plifying design. j Quiescent current, 3.6V supply 2.1mA (typ) The LM4673 is designed to meet the demands of mobile j Total shutdown power supply current 0.01µA (typ) phones and other portable communication devices. Operat- j Single supply range 2.4V to 5.5V in