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稳压型、3.3V电荷泵

紧凑的、无电感、小外形、3.3V电池备份电源,封装尺寸为0.075平方英寸

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主要特征

应用/用途

简化框图

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主要特征

  • Regulated 3.3V ±4% Output
  • Ultra-Small: 1.1mm-High, 8-Pin µMAX Package
  • No Inductors Required
  • Up to 1MHz Operation (small external components)
  • Fits into 0.05 in.²
  • Up to 85% Efficiency
  • 1.8V to 3.6V Input Voltage Range
  • 50µA Quiescent Supply Current
  • 1µA Shutdown Current
  • Only three small capacitors required

应用/用途

  • 备用电池升压转换器
  • 电池供电应用
  • 微型设备
  • 转换器
  • 双向寻呼

描述

The MAX679 step-up, regulated charge pump generates a 3.3V ±4% output voltage from a 1.8V to 3.6V input voltage (two alkaline, NiCd, or NiMH; or one Lithium-Ion battery). Output current is 20mA (min) from a 2.0V input. Only three external capacitors are needed to build a complete DC-DC converter.

The MAX679's switching frequency is pin selectable at 330kHz or 1MHz to allow trade-offs between lowest supply current and smallest-size capacitors. The logic shutdown function reduces the supply current to 5µA (max) and disconnects the load from the input. Special soft-start circuitry prevents excessive current from being drawn from the battery during start-up. This DC-DC converter requires no inductors and has low EMI. It is available in the ultra-small µMAX® package, which is only 1.11mm high and half the area of an 8-pin SO.

简化框图

MAX679:典型工作电路 MAX679: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