低成本、高精度、高边电流检测放大器

说明

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The MAX4172 is a low-cost, precision, high-side current-sense amplifier 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 battery charger's ground path. Wide bandwidth and ground-sensing capability make the MAX4172 suitable for closed-loop battery-charger and general-purpose current-source applications. The 0 to 32V input common-mode range is independent of the supply voltage, which ensures that current-sense feedback remains viable, even when connected to a battery in deep discharge.

To provide a high level of flexibility, the MAX4172 functions with an external sense resistor to set the range of load current to be monitored. It has a current output that can be converted to a ground-referred voltage with a single resistor, accommodating a wide range of battery voltages and currents.

An open-collector power-good output (active-low PG) indicates when the supply voltage reaches an adequate level to guarantee proper operation of the current-sense amplifier. The MAX4172 operates with a 3.0V to 32V supply voltage, and is available in a space-saving, 8-pin µMAX® or SO package.

关键特性

• Ideal for High-Side Monitoring
  • 3V to 32V Supply Operation
  • ±0.5% Typical Full-Scale Accuracy Over Temperature
  • High Accuracy +2V to +32V Common-Mode Range, Functional Down to 0V, Independent of Supply Voltage
  • 800kHz Bandwidth [V_SENSE = 100mV (1C)]
  • 200kHz Bandwidth [V_SENSE = 6.25mV (C/16)]
• Minimizes Board Space Requirements
  • µMAX and SO Packages

应用

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