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3.3V/5V/可调输出、升压型DC-DC转换器

对于新设计推荐使用性能更好的器件:MAX1674/MAX1675/MAX1676

产品详情

主要特征

应用/用途

简化框图

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主要特征

  • Operates Down to 0.7V Input Supply Voltage
  • 87% Efficiency at 200mA
  • 60µA Quiescent Current
  • 20µA Shutdown Mode with Active Reference and LBI Detector
  • 500kHz Maximum Switching Frequency
  • ±1.5% Reference Tolerance Over Temperature
  • Low-Battery Detector (LBI/LBO)
  • 8-Pin DIP and SO Packages

应用/用途

  • 2节和3节电池供电设备
  • 3.3V至5V升压转换
  • 血糖表
  • 医疗仪表
  • 掌上电脑
  • 个人数据通信/计算机
  • 便携式数据收集设备

描述

The MAX756/MAX757 are CMOS step-up DC-DC switching regulators for small, low input voltage or battery-powered systems. The MAX756 accepts a positive input voltage down to 0.7V and converts it to a higher pin-selectable output voltage of 3.3V or 5V. The MAX757 is an adjustable version that accepts an input voltage down to 0.7V and generates a higher adjustable output voltage in the range from 2.7V to 5.5V. Typical full-load efficiencies for the MAX756/MAX757 are greater than 87%.

The MAX756/MAX757 provide three improvements over previous devices. Physical size is reduced-the high switching frequencies (up to 0.5MHz) made possible by MOSFET power transistors allow for tiny (< 5mm diameter) surface-mount magnetics. Efficiency is improved to 87% (10% better than with low-voltage regulators fabricated in bipolar technology). Supply current is reduced to 60µA by CMOS construction and a unique constant-off-time pulse-frequency modulation control scheme.

简化框图

MAX756、MAX757:典型工作电路 MAX756、MAX757:典型工作电路 Zoom icon

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心