20W Stereo Class D Speaker Amplifier with Volume Control

The MAX9744 20W 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 4.5V to 14V single supply and can deliver up to 20W per channel into a 4Ω speaker with a 14V 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 75dB PSRR, low 0.04% THD+N, and SNR in excess of 90dB. 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 (7mm x 7mm x 0.8mm) package and is specified over the extended -40°C to +85°C temperature range.

Applications

* Flat-Panel Televisions * Multimedia Docking Stations * PC Speaker Systems

* Wide 4.5V to 14V Power-Supply Voltage Range

* Filterless Spread-Spectrum Modulation Lowers Radiated RF Emissions from Speaker Cables

* 20W Stereo Output (4Ω, VDD = 12V, THD+N = 10%)

* Integrated Volume Control (I²C or Analog)

* Low 0.04% THD+N

* High 75dB PSRR

* High 93% Efficiency

* Integrated Click-and-Pop Suppression

* Low-Power Shutdown Mode

* Short-Circuit and Thermal-Overload Protection

* Available in a 44-Pin Thin QFN-EP (7mm x 7mm x 0.8mm)