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高效率、升压型DC-DC转换器、输入可低至1V

对于新设计推荐使用性能更好的器件:MAX1678

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主要特征

简化框图

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主要特征

  • Built-In Synchronous Rectifier
  • 0.88V Guaranteed Start-Up
  • Ultra-Small µMAX Package: 1.1mm High
  • 83% Efficiency
  • 4µA Quiescent Supply Current into BATT Pin
  • 2µA Logic-Controlled Shutdown (MAX1642)
  • Two Undervoltage Detectors (MAX1643)
  • 2V to 5.2V Output Range
  • 20mA Output Current at 1.2V Input
  • Reverse Battery Protection

应用/用途

  • 寻呼机
  • 个人医疗监视器
  • 指针设备
  • 远端控制
  • 单节电池供电设备

描述

The MAX1642/MAX1643 are high-efficiency, low-voltage, step-up DC-DC converters intended for devices powered by a single alkaline cell. They feature low quiescent supply currents and are supplied in the ultra-small µMAX® package, which is only 1.1mm high. The guaranteed start-up voltage is 0.88V.

Each device consists of an internal 1Ω, N-channel MOSFET power switch; a built-in synchronous rectifier that acts as the catch diode; an oscillator; a reference; and pulse-frequency-modulation (PFM) control circuitry. Both devices feature an independent undervoltage comparator (PFI/PFO). The MAX1642 also includes a 2µA logic-controlled shutdown mode. The MAX1643 offers a dedicated low-battery detector (BATTLO) in lieu of shutdown.

The output voltage for each device is preset to 3.3V ±4%, or can be adjusted from +2V to +5.2V using only two resistors.

简化框图

MAX1642、MAX1643:典型工作电路 MAX1642、MAX1643:典型工作电路 Zoom icon

Technical Docs

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