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LM4670 Datasheet(PDF) 1 Page - Texas Instruments |
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LM4670 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 24 page LM4670 www.ti.com SNAS240C – DECEMBER 2004 – REVISED MAY 2013 LM4670 Boomer™ Audio Power Amplifier Series Filterless High Efficiency 3W Switching Audio Amplifier Check for Samples: LM4670 1 FEATURES DESCRIPTION The LM4670 is a fully integrated single-supply high 23 • No Output Filter Required for Inductive Loads efficiency switching audio amplifier. It features an • Externally Configurable Gain innovative modulator that eliminates the LC output • Very Fast Turn on Time: 1.35ms (Typ) filter used with typical switching amplifiers. Eliminating the output filter reduces external • Minimum External Components component count, simplifies circuit design, and • "Click and Pop" Suppression Circuitry reduces board area. The LM4670 processes analog • Micro-Power Shutdown Mode inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to • Short Circuit Protection conventional pulse width modulators. • Available in Space-Saving DSBGA and WSON Packages The LM4670 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is APPLICATIONS capable of driving a 4 Ω speaker load at a continuous • Mobile Phones average output of 2.3W with less than 1% THD+N. Its • PDAs flexible power supply requirements allow operation from 2.4V to 5.5V. • Portable Electronic Devices The LM4670 has high efficiency with speaker loads KEY SPECIFICATIONS compared to a typical Class AB amplifier. With a 3.6V supply driving an 8 Ω speaker, the IC's efficiency for a • Efficiency at 3.6V, 100mW into 8 Ω Speaker, 100mW power level is 77%, reaching 88% at 600mW 77% (Typ) output power. • Efficiency at 3.6V, 600mW into 8 Ω Speaker, The LM4670 features a low-power consumption 88% (Typ) shutdown mode. Shutdown may be enabled by • Efficiency at 5V, 1W into 8 Ω Speaker, 87% driving the Shutdown pin to a logic low (GND). (Typ) The gain of the LM4670 is externally configurable • Quiescent Current, 3.6V Supply, 4.8mA (Typ) which allows independent gain control from multiple • Total Shutdown Power Supply Current, 0.01µA sources by summing the signals. (Typ) • Single Supply Range, 2.4 to 5.5V 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 Boomer is a trademark of Texas Instruments. 3 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2004–2013, 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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