1.8W, Filterless, Stereo, Class D Audio Power Amplifier and DirectDrive Stereo Headphone Amplifier

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The MAX9702 combines a highly efficient Class D speaker amplifier with a high-linearity Class AB headphone amplifier. This ensures maximum battery life in speaker mode and maximum performance in headphone mode. The MAX9702 delivers up to 1.1W per channel into an 8Ω load and 1.8W into a 4Ω load from a 5V power supply. Maxim's 2nd-generation, spread-spectrum modulation scheme renders the traditional Class D output filter unnecessary.

The MAX9702 speaker amplifier offers two modulation schemes: a fixed-frequency (FFM) mode and a spread-spectrum (SSM) mode that reduces EMI-radiated emissions. The MAX9702 speaker amplifier features a fully differential architecture, full-bridged (BTL) output, and comprehensive click-and-pop suppression. The MAX9702 speaker amplifier features high 75dB PSRR, low 0.07% THD+N, and SNR in excess of 97dB. Short-circuit and thermal-overload protection prevent the device from being damaged during a fault condition.

The headphone amplifier uses Maxim's DirectDrive® architecture that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, board space, and component height. A high 80dB PSRR and low 0.02% THD+N ensures clean, low-distortion amplification of the audio signal.

An I²C interface sets the speaker and headphone gain, mono, stereo, and mute functions.

The MAX9702 is available in a 28-pin thin QFN-EP (5mm x 5mm x 0.8mm) package. The MAX9702 is specified over the extended -40°C to +85°C temperature range.
MAX9702: Simplified Block Diagram MAX9702: Simplified Block Diagram Enlarge+

Key Features

  • Spread-Spectrum Modulation Reduces EMI Emissions
  • Programmable Mono, Stereo, Mute, and Mix Functions
  • 1.1W Stereo Output (8Ω, VDD = 5V)
  • 48mW Headphone Output (32Ω, VDD = 3.3V)
  • 1.8W Stereo Output (4Ω, VDD = 5V)
  • 94% Efficiency (RL = 8Ω, PO = 1.1W)
  • High 73dB PSRR (f = 217Hz)
  • I²C Programmable Gain Up to +21dB
  • Integrated Click-and-Pop Suppression
  • Low-Power Shutdown Mode (0.1µA)
  • Short-Circuit and Thermal-Overload Protection
  • ±8kV (HBM) ESD-Protected Headphone Driver Outputs


  • Automotive Multimedia
  • Cell Phones
  • Docking Stations
  • Handheld Gaming Consoles
  • MP3 Player
  • Multimedia Phones
  • PDA Phone
  • PMP Player
  • Smartphone

Quality and Environmental Data

Request Reliability Report for: MAX9702 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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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