MAX4295

PRODUCTION

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

Data Sheet (Rev. 3) Product Selection Table
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Overview

  • +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

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.

Applications

  • AC Amplifiers
  • Battery-Powered Speakers
  • Boom Boxes
  • Cordless Phones
  • Game Cards
  • Palmtop/Notebook Computers
  • PDA Audio
  • Portable Equipment
  • Sound Cards
MAX4295
Mono, 2W, Switch-Mode (Class D) Audio Power Amplifier
MAX4295: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

Technical Articles 2

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Evaluation Kits

MAX4295EVKIT

Evaluation Kit for the MAX4295

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Features and Benefits

  • 2W/Channel Output Power at 5V
  • 0.7W/Channel Output Power at 3V
  • Programmable PWM Oscillator Frequency Selection (125kHz, 250kHz, 500kHz, 1MHz)
  • Low 0.4% THD+N (RL = 4Ω, fIN = 1kHz, fOSC = 250kHz)
  • +2.7V to +5.5V Input Range
  • Volume Control
  • Fully Assembled and Tested Surface-Mount Board

Product Details

The MAX4295 is a mono, switch-mode (Class-D) audio power amplifier intended for multimedia and general-purpose high-power applications. It has greater than 87% efficiency and is capable of delivering 2W maximum continuous power to a 4Ω load.

The MAX4295 evaluation kit (EV kit) is a fully assembled and tested surface-mount board. The EV kit is designed to be driven by the lineout or headphone jack of a CD player or to be directly connected to any audio source. The EV kit includes a volume control and a terminal block for quick speaker connection.

Applications

  • Computers: Desktop, Workstation, Server
  • Consumer Audio
  • Cordless Phones
  • Notebook Computers
  • Palmtop Computers
  • Pen Entry Palmtops
MAX4295EVKIT
Evaluation Kit for the MAX4295

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