The LM4681 is a fully integrated single supply, CLASS D audio power amplifier solution. The LM4681 utilizes a proprietary balanced pulse-width modulation technique that lowers output noise and THD and improves PSRR when compared to conventional pulse width modulators. The LM4681 also features a stereo headphone amplifier that delivers 80mW into a 32 headset with less than 0.5% THD. The LM4681's I2C/SPI (selectable) volume control has a +30dB to 48dB range when speakers are driven and a range of +13dB to 65dB when headphones are connected. All amplifiers are protected by thermal shutdown. Additionally, the high efficiency power amplifiers have output current limit.