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MAX9744：20W Stereo Class D Speaker Amplifier with Volume Control

Delivers 2 x 20W from 12V Supply into 4Ω Loads

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.

Key Features 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)

MAX9744: Simplified Block Diagram Applications/Uses Flat-Panel Televisions Multimedia Docking Stations PC Speaker Systems

DataSheet

Parametrics

Design kits & evaluation modules

• MAX9744EVCMAXQU
• MAX9744EVKIT

Quality and Environmental Data

• MAX9744.pdf

Ordering Information