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LM4674A bảng dữ liệu(PDF) 1 Page - Texas Instruments |
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LM4674A bảng dữ liệu(HTML) 1 Page - Texas Instruments |
1 / 19 page LM4674A www.ti.com SNAS366A – SEPTEMBER 2006 – REVISED MAY 2013 LM4674A Filterless 2.5W Stereo Class D Audio Power Amplifier Check for Samples: LM4674A 1 FEATURES DESCRIPTION The LM4674A is a single supply, high efficiency, 2 • Output Short Circuit Protection 2.5W/channel, filterless switching audio amplifier. A • Stereo Class D Operation low noise PWM architecture eliminates the output • No Output Filter Required filter, reducing external component count, board area consumption, system cost, and simplifying design. • Logic Selectable Gain • Independent Shutdown Control The LM4674A is designed to meet the demands of mobile phones and other portable communication • Minimum External Components devices. Operating from a single 5V supply, the • Click and Pop Suppression device is capable of delivering 2.5W/channel of • Micro-Power Shutdown continuous output power to a 4 Ω load with less than 10% THD+N. Flexible power supply requirements • Available in Space-Saving 2mm x 2mm x allow operation from 2.4V to 5.5V. 0.6mm DSBGA Package The LM4674A features high efficiency compared to APPLICATIONS conventional Class AB amplifiers. When driving an 8 Ω speaker from a 3.6V supply, the device features • Mobile Phones 85% efficiency at PO = 500mW. Four gain options are • PDAs pin selectable through the GAIN0 and GAIN1 pins. • Laptops Output short circuit protection prevents the device from being damaged during fault conditions. Superior KEY SPECIFICATIONS click and pop suppression eliminates audible transients on power-up/down and during shutdown. • Efficiency at 3.6V, 100mW into 8 Ω 80% (typ) Independent left/right shutdown controls maximizes • Efficiency at 3.6V, 500mW into 8 Ω 85% (typ) power savings in mixed mono/stereo applications. • Efficiency at 5V, 1W into 8 Ω 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 0.1 μA (typ) 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2006–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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