Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier

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The MAX4295 mono, switch-mode (Class D) audio power amplifier operates from a single +2.7V to +5.5V supply. The MAX4295 has > 85% efficiency and is capable of delivering 2W continuous power to a 4Ω load, making it ideal for portable multimedia and general-purpose high-power audio applications.

The MAX4295 features a total harmonic distortion plus noise (THD+N) of 0.4% (fOSC = 125kHz), low quiescent current of 2.8mA, high efficiency, and clickless power-up and shutdown. The active-low SHDN input disables the device and limits supply current to < 1.5µA. Other features include a 1A current limit, thermal protection, and undervoltage lockout.

The MAX4295 reduces the number of required external components. Internal high-speed power-MOS transistors allow operation as a bridge-tied load (BTL) amplifier. The BTL configuration eliminates the need for isolation capacitors on the output. The frequency-selectable pulse-width modulator (PWM) allows the user to optimize the size and cost of the output filter.

The MAX4295 is offered in a space-saving 16-pin QSOP or narrow SO package.
MAX4295: Typical Operating Circuit MAX4295: Typical Operating Circuit Enlarge+

Key Features

  • +2.7V to +5.5V Single-Supply Operation
  • 2W/Channel Output Power at 5V
  • 0.7W/Channel Output Power at 3V
  • 87% Efficiency (RL = 4Ω, POUT = 2W)
  • 0.4% THD+N (RL = 4Ω, fOSC = 125kHz)
  • Logic-Programmable PWM Frequency Selection (125kHz, 250kHz, 500kHz, 1MHz)
  • Low-Power Shutdown Mode
  • Clickless Transitions Into and Out of Shutdown
  • 1A Current Limit and Thermal Protection
  • Available in Space-Saving Packages
    • 16-Pin QSOP or Narrow SO


  • AC Amplifiers
  • Battery-Powered Speakers
  • Boom Boxes
  • Cordless Phones
  • Game Cards
  • Palmtop/Notebook Computers
  • PDA Audio
  • Portable Equipment
  • Sound Cards

MAX4295EVKIT: Evaluation Kit for the MAX4295

CAD Symbols and Footprints

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  • MAX4295ESE
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  • 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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