LM4674A

LM4674A www.ti.com SNAS366A – SEPTEMBER 2006 – REVISED MAY 2013 LM4674A Filterless 2.5W Stereo Class D Audio Power Amplifier Check for Samples: LM4674A 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 Package 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% 2.5W (typ) Power Output at VDD = 5V, RL = 8Ω, THD ≤ 10% 1.5W (typ) Shutdown Current 0.1μA (typ) DESCRIPTION The LM4674A 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 LM4674A 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 LM4674A features high efficiency compared to conventi...