MAX4295

单声道/立体声、2W、开关模式(D类)音频功率放大器


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说明

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:典型工作电路 MAX4295:典型工作电路 放大+

关键特性

  • +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

应用

  • AC放大器
  • 电池供电扬声器
  • 音箱
  • 无绳电话
  • 游戏卡
  • 掌上电脑/笔记本电脑
  • PDA音频
  • 便携式设备
  • 声卡

MAX4295EVKIT: MAX4295评估板

CAD Symbols and Footprints

  • MAX4295EEE
  • MAX4295EEE+
  • MAX4295EEE+T
  • MAX4295EEE-T
  • MAX4295ESE
  • MAX4295ESE+
  • MAX4295ESE+T
  • MAX4295ESE-T
  • 型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

    备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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    类型 编号 标题
    评估板2502MAX4295EVKIT MAX4295评估板