LM4673

LM4673, LM4673SDBD, LM4673TMBD www.ti.com SNAS317D – DECEMBER 2005 – REVISED MAY 2013 LM4673 Filterless, 2.65W, Mono, Class D Audio Power Amplifier Check for Samples: LM4673, LM4673SDBD, LM4673TMBD FEATURES 1 2 Mono Class D Operation No Output Filter Required for Inductive Loads Externally Configurable Gain Very Fast Turn On Time: 17μs (typ) Minimum External Components "Click and Pop" Suppression Circuitry Micro-Power Shutdown Mode Available in Space-Saving 0.4mm Pitch DSBGA and WSON Packages APPLICATIONS Mobile Phones PDAs Portable Electronic Devices KEY SPECIFICATIONS Efficiency at 3.6V, 400mW into 8Ω Speaker 88% (typ) Efficiency at 3.6V, 100mW into 8Ω Speaker 80% (typ) Efficiency at 5V, 1W into 8Ω Speaker 86% (typ) Quiescent Current, 3.6V Supply 2.1mA (typ) Total Shutdown Power Supply Current 0.01µA (typ) Single Supply Range 2.4V to 5.5V PSRR, f = 217Hz 78dB DESCRIPTION The LM4673 is a single supply, high efficiency, 2.65W, mono, Class D audio amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, board area consumption, system cost, 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 4Ω speaker load at a continuous average output of 2.1W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V. The ...