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Maxim产品 - MAX1771介绍

MAX1771 - 12V或可调、高效率、低IQ、升压型DC-DC控制器

MAX1771是Maxim美信半导体公司的一款DC-DC开关调节器产品，MAX1771是12V或可调、高效率、低IQ、升压型DC-DC控制器，本站介绍了MAX1771的封装应用图解、特点和优点、功能等，并给出了与MAX1771相关的Maxim元器件型号供参考。

MAX1771 - 12V或可调、高效率、低IQ、升压型DC-DC控制器 - DC-DC开关调节器 - 低压输入时提供高效转换，降低噪声 - 美信半导体

产品概述

The MAX1771 step-up switching controller provides 90% efficiency over a 30mA to 2A load. A unique current-limited pulse-frequency-modulation (PFM) control scheme gives this device the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using less than 110µA of supply current (vs. 2mA to 10mA for PWM converters).

This controller uses miniature external components. Its high switching frequency (up to 300kHz) allows surface-mount magnetics of 5mm height and 9mm diameter. It accepts input voltages from 2V to 16.5V. The output voltage is preset at 12V, or can be adjusted using two resistors.

The MAX1771 optimizes efficiency at low input voltages and reduces noise by using a single 100mV current-limit threshold under all load conditions. A family of similar devices, the MAX770-MAX773, trades some full-load efficiency for greater current-limit accuracy; they provide a 200mV current limit at full load, and switch to 100mV for light loads.

The MAX1771 drives an external N-channel MOSFET switch, allowing it to power loads up to 24W. If less power is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with on-board MOSFETs. An evaluation kit is available.

关键特性
  • 以下关键特性由Maxim美信半导体提供：
  • 90% Efficiency for 30mA to 2A Load Currents
  • Up to 24W Output Power
  • 110µA (max) Supply Current
  • 5µA (max) Shutdown Current
  • 2V to 16.5V Input Range
  • Preset 12V or Adjustable Output Voltage
  • Current-Limited PFM Control Scheme
  • Up to 300kHz Switching Frequency
  • Evaluation Kit Available
    • 热门应用
  • 电池供电应用
  • 闪存编程
  • 大功率射频功放电源
  • 掌上电脑/手持终端
  • 便携式通信装置
  • LCD正偏置发生器
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