Maxim's MAX9744 20 W, stereo, class D audio-power amplifier provides class AB amplifier performance with class D efficiency
The MAX9744 20 W, stereo, class D audio-power amplifier provides class AB amplifier performance with class D efficiency, conserving board space and eliminating the need for a bulky heatsink. This device features single-supply operation, adjustable gain, shutdown mode, a SYNC output, speaker mute, and industry-leading click-and-pop suppression. The MAX9744 features a 64-step, dual-mode (analog or digital), programmable volume control and mute function. The MAX9744 operates from a 4.5 V to 14 V single-supply and can deliver up to 20 W per channel into a 4 Ω speaker with a 14 V supply. The MAX9744 offers two modulation schemes: a fixed-frequency modulation mode that allows one of several preset switching frequencies to be selected, and a spread-spectrum modulation mode that helps to reduce EMI-radiated emissions. The MAX9744 features high 75 dB PSRR, low 0.04% THD+N, and SNR in excess of 90 dB. Robust short-circuit and thermal-overload protection prevent device damage during a fault condition. The MAX9744 is available in a 44-pin, thin QFN-EP (7 mm x 7 mm x 0.8 mm) package and is specified over the extended -40°C to 85°C temperature range.