1.4W and 1W, Ultra-Small, Audio Power Amplifiers with Shutdown

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The MAX4364/MAX4365 are bridged audio power amplifiers intended for portable audio devices with internal speakers. The MAX4364 is capable of delivering 1.4W from a single 5V supply and 500mW from a single 3V supply into an 8Ω load. The MAX4365 is capable of delivering 1W from a single 5V supply and 450mW from a single 3V supply into an 8Ω load. The MAX4364/MAX4365 feature 0.04% THD+N at 1kHz, 68dB PSRR at 217Hz, and only 10nA of supply current in shutdown mode.

The MAX4364/MAX4365 bridged outputs eliminate the need for output-coupling capacitors, minimizing external component count. The MAX4364/MAX4365 also include internal DC bias generation, clickless operation, short-circuit and thermal-overload protection. Both devices are unity-gain stable, with the gain set by two external resistors.

The MAX4364 is available in a small 8-pin SO package. The MAX4365 is available in tiny 8-pin TDFN (3mm x 3mm x 0.8mm) and µMAX® packages.
MAX4364, MAX4365: Pin Configuration MAX4364, MAX4365: Pin Configuration Enlarge+

Key Features

  • 1.4W into 8Ω Load (MAX4364)
  • 1W into 8Ω Load (MAX4365)
  • 0.04% THD+N at 1kHz
  • 68dB PSRR at 217Hz
  • 2.7V to 5.5V Single-Supply Operation
  • 5mA Supply Current
  • Low-Power, 10nA Shutdown Mode
  • Pin Compatible with the LM4861/LM4862/LM4864 (MAX4364)
  • Clickless Power-Up and Shutdown
  • Thermal-Overload and Short-Circuit Protection
  • Available in TDFN, µMAX, and SO Packages


  • Cell Phones
  • General-Purpose Audio
  • PDAs
  • Two-Way Radios

Technical Documents

App Note 988 Driving Audio Piezoelectric Transducers
Product Reliability Reports: MAX4364.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.

Quality Management System >
Environmental Management System >


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