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MAX4172：低成本、高精度、高边电流检测放大器

低成本、高精度电流监测，用于便携式电池供电产品

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 [VSENSE = 100mV (1C)] 200kHz Bandwidth [VSENSE = 6.25mV (C/16)] Minimizes Board Space Requirements µMAX and SO Packages

MAX4172：典型工作电路 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

数据手册DataSheet

关键参数

技术资料

• Derive Simple High-Current Source from Lab Supply
• Moving-Coil Meter Measures Low-Level Currents
• High-Side Current-Sense Amplifier Operates at High Voltage
• High-Side Positive Current Sensor Monitors Negative Supply
• Overload Circuitry Protects Batteries and Power Supplies
• Overcurrent Monitor Operates up to 26V

质量和环境数据

• MAX4172.pdf

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