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 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. 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 …
