LM4674

LM4674 www.ti.com SNAS344E – DECEMBER 2005 – REVISED APRIL 2013 LM4674 Filterless 2.5W Stereo Class D Audio Power Amplifier Check for Samples: LM4674 FEATURES 1 2 Output Short Circuit Protection Stereo Class D Operation No Output Filter Required Logic Selectable Gain Independent Shutdown Control Minimum External Components Click and Pop Suppression Micro-Power Shutdown Available in Space-Saving 2mm x 2mm x 0.6mm DSBGA, and 4mm x 4mm x 0.8mm WQFN Packages APPLICATIONS Mobile Phones PDAs Laptops KEY SPECIFICATIONS Efficiency at 3.6V, 100mW into 8Ω: 80% (typ) Efficiency at 3.6V, 500mW into 8Ω: 85% (typ) Efficiency at 5V, 1W into 8Ω: 85% (typ) Quiescent Power Supply Current at 3.6V supply: 4mA Power Output at VDD = 5V, RL = 4Ω, THD ≤ 10%: 2.5 W (typ) Shutdown Current: 0.03μA (typ) DESCRIPTION The LM4674 is a single supply, high efficiency, 2.5W/channel, filterless switching audio amplifier. A low noise PWM architecture eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. The LM4674 is designed to meet the demands of mobile phones and other portable communication devices. Operating from a single 5V supply, the device is capable of delivering 2.5W/channel of continuous output power to a 4Ω load with less than 10% THD+N. Flexible power supply requirements allow operation from 2.4V to 5.5V. The LM4674 features high efficiency compared to conventional Class AB amplifiers. ...