20W Stereo Class D Speaker Amplifier with Volume Control

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

Please check latest availability status for a specific part variant.


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.
MAX9744: Simplified Block Diagram MAX9744: Simplified Block Diagram Enlarge+

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)


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

See parametric specs for Speaker Amplifiers (36)

Part NumberClassSpkr. Amp. VCC
Spkr. Amp. VCC
POUT into 4Ω @ 10% THD+N
Spkr. Amp. Half Pwr. THD+N
(min)(max)(min)(A- Weighted)(min)(See Notes)
MAX9744 D4.514200.049575
$2.45 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX9744EVCMAXQU: Evaluation Kit/Evaluation System for the MAX9744
MAX9744EVKIT: Evaluation Kit/Evaluation System for the MAX9744
Product Reliability Reports: MAX9744.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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