LM4915

LM4915 www.ti.com SNAS176A – MAY 2003 – REVISED MAY 2013 LM4915 Pseudo-Differential Mono Headphone Amplifier with Fixed 6dB Gain Check for Samples: LM4915 FEATURES 1 2 Pseudo-Differential Amplification Internal Gain-Setting Resistors Available in Space-Saving WQFN Package Ultra Low Current Shutdown Mode Can Drive Capacitive Loads up to 500pF Improved Pop & Click Circuitry Virtually Eliminates Noises During Turn-On and TurnOff Transitions 2.2 - 5.5V Operation No Output Coupling Capacitors, Snubber Networks, Bootstrap Capacitors or GainSetting Resistors Required Ultra Low Noise KEY SPECIFICATIONS Improved PSRR at 217Hz and 1kHz: 75dB (Typ) Power Output at 5.0V & 1% THD into 32Ω: 280mW (Typ) Power Output at 3.0V & 1% THD into 32Ω: 90mW (Typ) Output Noise, A-weighted: 20μV (Typ) APPLICATIONS Mobile Phones PDAs Portable Electronics Devices DESCRIPTION The LM4915 is a pseudo-differential audio power amplifier primarily designed for demanding applications in mobile phones and other portable audio device applications with mono headphones. It is capable of delivering 90 miliwatts of continuous average power to a 32Ω BTL load with less than 1% distortion (THD+N) from a 3VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4915 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile pho...