Part # LM4915 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM4915 Boomer ® Audio Power Amplifier Series Pseudo-Differential Mono Headphone Amplifier with Fixed 6dB Gain


Part Details:

LM4915 May 2003 Pseudo-Differential LM4915Pseudo-Differential Mono Headphone Amplifier withFixed 6dB GainGeneral Description Key Specifications The LM4915 is a pseudo-differential audio power amplifier n Improved PSRR at 217Hz and 1kHz 75dB (typ) primarily designed for demanding applications in mobile n Power Output at 5.0V & 1% THD into 32 280mW (typ) phones and other portable audio device applications with n Power Output at 3.0V & 1% THD into 32 90mW (typ) mono headphones. It is capable of delivering 90 miliwatts of n Output Noise, A-weighted 20µV (typ) continuous average power to a 32 BTL load with less than1% distortion (THD+N) from a 3V power supply. DC Features Mono Boomer audio power amplifiers were designed specifically to n Pseudo-differential amplification provide high quality output power with a minimal amount ofexternal components. The LM4915 does not require output n Internal gain-setting resistors coupling capacitors or bootstrap capacitors, and therefore is n Available in space-saving LLP package Headphone ideally suited for mobile phone and other low voltage appli- n Ultra low current shutdown mode cations where minimal power consumption is a primary re- n Can drive capacitive loads up to 500pF quirement. n Improved pop & click circuitry virtually eliminates noises The LM4915 features a low-power consumption shutdown during turn-on and turn-off transitions mode. To facilitate this, Shutdown may be enabled by driving n 2.2 - 5.5V operation the shutdown pin low. Additionally, the LM4915 features an n No output coupling capacitors, snubber networks, internal thermal shutdown protection mechanism. bootstrap capacitors or gain-setting resistors required The LM4915 contains advanced pop & click circuitry which n Ultra low noise Amplifier virtually eliminates noises which would otherwise occur dur-ing turn-on and turn-off transitions. Applications The LM4915 has an internally fixed gain of 6dB. n Mobile phones n PDAs n Portable electronics devices with Typical Application Fixed 6dB


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LM4915.pdf Datasheet