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高精度、高边电流检测放大器

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主要特征

应用/用途

简化框图

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主要特征

  • Complete High-Side Current Sensing
  • Precision Internal Sense Resistor (MAX471)
  • 2% Accuracy Over Temperature
  • Monitors Both Charge and Discharge
  • 3A Sense Capability with Internal Sense Resistor (MAX471)
  • Higher Current-Sense Capability with External Sense Resistor (MAX472)
  • 100µA Max Supply Current
  • 18µA Max Shutdown Mode
  • 3V to 36V Supply Operation
  • 8-Pin DIP/SO Packages

应用/用途

  • 电池供电应用
  • 蜂窝电话
  • 能量管理
  • 便携式PC:笔记本电脑、亚笔记本电脑、掌上电脑
  • 便携电话
  • 便携式测试/测量系统
  • 智能电池组/充电器

描述

The MAX471/MAX472 are complete, bidirectional, high-side current-sense amplifiers for portable PCs, telephones, and other systems where battery/DC power-line monitoring is critical. High-side power-line monitoring is especially useful in battery-powered systems, since it does not interfere with the ground paths of the battery chargers or monitors often found in "smart" batteries.

The MAX471 has an internal 35mΩ current-sense resistor and measures battery currents up to ±3A. For applications requiring higher current or increased flexibility, the MAX472 functions with external sense and gain-setting resistors. Both devices have a current output that can be converted to a ground-referred voltage with a single resistor, allowing a wide range of battery voltages and currents.

An open-collector SIGN output indicates current-flow direction, so the user can monitor whether a battery is being charged or discharged. Both devices operate from 3V to 36V, draw less than 100µA over temperature, and include a 18µA max shutdown mode.

简化框图

MAX471、MAX472:典型工作电路 MAX471、MAX472:典型工作电路 Zoom icon

技术文档

支持和培训

在Maxim的知识库中搜索技术问题的答案

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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