原创 MAX4295

MAX4295<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

概述

     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% (f_OSC = 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 <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />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.

关键特性

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• +2.7V to +5.5V Single-Supply Operation
  
  
• 2W/Channel Output Power at 5V 0.7W/Channel Output Power at 3V
  
  
• 87% Efficiency (R_L = 4Ω, P_OUT = 2W)
  
  
• 0.4% THD+N (R_L = 4Ω, f_OSC = 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

应用

AC放大器

电池供电扬声器

音箱

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