LM4809

LM4809, LM4809LQBD www.ti.com SNAS126F – FEBRUARY 2001 – REVISED APRIL 2013 LM4809 Dual 105mW Headphone Amplifier with ActiveLow Shutdown Mode Check for Samples: LM4809, LM4809LQBD FEATURES 1 2 Active-Low Shutdown Mode "Click and Pop" Reduction Circuitry Low Shutdown Current WSON, MSOP, and SOIC Surface Mount Packaging No Bootstrap Capacitors Required Unity-Gain Stable APPLICATIONS Headphone Amplifier Personal Computers Microphone Preamplifier PDA's KEY SPECIFICATIONS THD+N at 1kHz at 105mW Continuous Average Power into 16Ω 0.1% (typ) THD+N at 1kHz at 70mW Continuous Average Power into 32Ω 0.1% (typ) Shutdown Current 0.4µA (typ) DESCRIPTION The LM4809 is a dual audio power amplifier capable of delivering 105mW per channel of continuous average power into a 16Ω load with 0.1% (THD+N) from a 5V power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4809 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The unity-gain stable LM4809 can be configured by external gain-setting resistors. The LM4809 features an externally controlled, activelow, micropower consumption shutdown mode, as well as an internal thermal shutdown protection mechanism. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instrument...