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Mono/Stereo High-Power Class D Amplifier

Versatile Pin-for-Pin Compatible Family of Filterless Class D Amplifers Offer Industry-Leading Solution Cost
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Active: In Production.


The MAX9736A/B/D Class D amplifiers provide high-performance, thermally efficient amplifier solutions. The MAX9736A delivers 2 x 15W into 8Ω loads, or 1 x 30W into a 4Ω load. The MAX9736B/D deliver 2 x 6W into 8Ω loads or 1 x 12W into a 4Ω load.

These devices operate from 8V to 28V and provide a high PSRR, eliminating the need for a regulated power supply. The MAX9736 offers up to 88% efficiency at 12V supply.

Pin-selectable modulation schemes select between filterless modulation and classic PWM modulation. Filterless modulation allows the MAX9736 to pass CE EMI limits with 1m cables using only a low-cost ferrite bead and capacitor on each output. Classic PWM modulation is optimized for best audio performance when using a full LC filter.

A pin-selectable stereo/mono mode allows stereo operation into 8Ω loads or mono operation into 4Ω loads. In mono mode, the right input op amp becomes available as a spare device, allowing flexibility in system design. Comprehensive click-and-pop reduction circuitry minimizes noise coming into and out of shutdown or mute.

Input op amps allow the user to create summing amplifiers, lowpass or highpass filters, and select an optimal gain.

The MAX9736A/B/D are available in 32-pin TQFN packages and specified over the -40°C to +85°C temperature range.

Data Sheet

Download this datasheet in PDF formatDownload Rev 3 (PDF, 668kB)
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An evaluation board is available: MAX9736AEVKIT MAX9736DEVKIT

Key Features

  • Wide 8V to 28V Supply Voltage Range
  • Spread-Spectrum Modulation Enables Low EMI Solution
  • Passes CE EMI Limits with Low-Cost Ferrite Bead/Capacitor Filter
  • Low BOM Cost
  • High 67dB PSRR at 1kHz Reduces Supply Cost
  • 88% Efficiency Eliminates Heatsink
  • Thermal and Output Current Protection
  • < 1µA Shutdown Mode
  • Mute Function
  • Space-Saving, 32-Pin TQFN Packages, 7mm x 7mm x 0.8mm (MAX9736A/B), 5mm x 5mm x 0.8mm (MAX9736D)


  • All-in-One PCs
  • LCD/PDP/CRT Monitors
  • MP3 Docking Stations
  • Notebook PCs
  • PC Speakers


MAX9736: Simplified Diagram
Simplified Diagram

More Information

New Product Press Release   2008-04-24 ]

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Document Ref.: 19-3108 Rev 3; 2009-10-13
This page last modified: 2010-06-07