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LM4674TL Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4674TL Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 18 page  LM4674 Filterless 2.5W Stereo Class D Audio Power Amplifier General 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 ex- ternal 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. Operat- ing from a single 5V supply, the device is capable of deliv- ering 2.5W/channel of continuous output power to a 4 Ω load with less than 10% THD+N. Flexible power supply require- ments allow operation from 2.4V to 5.5V. The LM4674 features high efficiency compared to conven- tional Class AB amplifiers. When driving and 8 Ω speaker from a 3.6V supply, the device features 85% efficiency at P O = 500mW. Four gain options are pin selectable through the GAIN0 and GAIN1 pins. Output short circuit protection prevents the device from be- ing damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. Independent left/right shutdown con- trols maximizes power savings in mixed mono/stereo appli- cations. Key Specifications j Efficiency at 3.6V, 100mW into 8 Ω 80% (typ) j Efficiency at 3.6V, 500mW into 8 Ω 85% (typ) j Efficiency at 5V, 1W into 8 Ω 85% (typ) j Quiescent Power Supply Current at 3.6V supply 4mA j Power Output at VDD = 5V, R L =4 Ω, THD ≤ 10% 2.5W (typ) j Power Output at VDD = 5V, R L =8 Ω, THD ≤ 10% 1.5W (typ) j Shutdown current 0.1µA (typ) Features n Output Short Circuit Protection n Stereo Class D operation n No output filter required n Logic selectable gain n Independent shutdown control n Minimum external components n Click and Pop suppression n Micro-power shutdown n Available in space-saving 2mm x 2mm x 0.6mm micro SMD package Applications n Mobile phones n PDAs n Laptops Boomer® is a registered trademark of National Semiconductor Corporation. December 2005 © 2005 National Semiconductor Corporation DS201674 www.national.com |
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