1. Products
  2. Audio Products
  3. Audio Amplifiers
  4. MAX9709


Features and Benefits

  • 2 x 25W Output Power in Stereo Mode (8Ω, THD = 10%)
  • 1 x 50W Output Power in Mono Mode (4Ω, THD = 10%)
  • High Efficiency: Up to 87%
  • Filterless Class D Amplifier
  • Unique Spread-Spectrum Mode
  • Programmable Gain (+22dB, +25dB, +29.5dB, +36dB)
  • High PSRR (90dB at 1kHz)
  • Differential Inputs Suppress Common-Mode Noise
  • Shutdown and Mute Control
  • Integrated Click-and-Pop Suppression
  • Low 0.1% THD+N
  • Current Limit and Thermal Protection
  • Programmable Thermal Flag
  • Clock Synchronization Input and Output
  • Available in Thermally Efficient, Space-Saving Package: 56-Pin TQFN

Product Details

The MAX9709 stereo/mono, Class D audio power amplifier delivers up to 2 x 25W into an 8Ω stereo mode and 1 x 50W into a 4Ω load in mono mode while offering up to 87% efficiency. The MAX9709 provides Class AB amplifier performance with the benefits of Class D efficiency, eliminating the need for a bulky heatsink and conserving power. The MAX9709 operates from a single +10V to +22V supply, driving the load in a BTL configuration.

The MAX9709 offers two modulation schemes: a fixed-frequency modulation (FFM) mode, and a spread-spectrum modulation (SSM) mode that reduces EMI-radiated emissions. The MAX9709 can be synchronized to an external clock from 600kHz to 1.2MHz. A synchronized output allows multiple units to be cascaded in the system.

Features include fully differential inputs, comprehensive click-and-pop suppression, and four selectable-gain settings (22dB, 25dB, 29.5dB, and 36dB). A pin-programmable thermal flag provides seven different thermal warning thresholds. Short-circuit and thermal-overload protection prevent the device from being damaged during a fault condition.

The MAX9709 is available in a 56-pin TQFN (8mm x 8mm x 0.8mm) package, and is specified over the extended -40°C to +85°C temperature range.


  • LCD TVs
  • PC/HiFi Audio Solutions
  • PDP TVs

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Product Recommendations

MAX9709 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX9709ETN+ Material Declaration Reliability Data 56-LFCSP-8X8X0.75
MAX9709ETN+D Material Declaration Reliability Data 56-LFCSP-8X8X0.75
MAX9709ETN+TD Material Declaration Reliability Data 56-LFCSP-8X8X0.75
Wafer Fabrication Data MAX9709 Reliability Data

Sample & Buy

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