330mW, Ultra-Small, Audio Power Amplifiers with Shutdown

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The MAX4366/MAX4367/MAX4368 are bridged audio power amplifiers intended for devices with internal speakers and headsets. The MAX4366/MAX4367/MAX4368 are capable of delivering 330mW of continuous power into a 32Ω load, or 200mW into a 16Ω load with 1% THD+N from a single 5V supply.

The MAX4366/MAX4367/MAX4368 bridged outputs eliminate the need for output-coupling capacitors minimizing external component count. The MAX4366/MAX4367/MAX4368 also feature a low-power shutdown mode, clickless power-up/power-down and internal DC bias generation. The MAX4366 is a unity-gain stable, programmable gain amplifier. The MAX4367/MAX4368 feature internally preset gains of 2V/V and 3V/V, respectively.

All devices are available in space-saving 8-pin TDFN and 8-bump UCSP™ chip-scale packages.
MAX4366, MAX4367, MAX4368: Typical Operating Circuit MAX4366, MAX4367, MAX4368: Typical Operating Circuit Enlarge+

Key Features

  • Drives 330mW into 32Ω (200mW into 16Ω)
  • 0.02% THD+N at 1kHz (120mW into 32Ω)
  • Internal Bridged Configuration
  • No Output-Coupling Capacitors
  • 2.3V to 5.5V Single-Supply Operation
  • 2mA Supply Current
  • Low-Power Shutdown Mode
  • Clickless Power-Up and Shutdown
  • Thermal Overload Protection
  • Available in TDFN and UCSP Packages


  • Cellular Phones
  • General-Purpose Audio
  • Headphones
  • Headsets
  • PDAs
  • Two-Way Radios
Product Reliability Reports: MAX4367.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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