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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

产品详情

主要特征

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 150
VOS @25°C (µV) (max) 750
Output Format Current
CMVR (V) (min) 0
CMVR (V) (max) 32
VCC (V) (min) 3
VCC (V) (max) 32
ICC (µA) (typ) 800
Bi-Dir. Curr. Sense No
Gain 10 µA/mV
Gain Accuracy @25°C (%) (max) 2
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
2.46
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参量

Parametric specs for Current Sense Amplifiers
VSENSE_FS (mV) (recomm.) 150
VOS @25°C (µV) (max) 750
Output Format Current
CMVR (V) (min) 0
CMVR (V) (max) 32
VCC (V) (min) 3
VCC (V) (max) 32
ICC (µA) (typ) 800
Bi-Dir. Curr. Sense No
Gain 10 µA/mV
Gain Accuracy @25°C (%) (max) 2
Oper. Temp. (°C) -40 to +85
Package/Pins SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
2.46

主要特征

  • 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

应用/用途

  • 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

描述

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.

简化框图

MAX4172:典型工作电路 MAX4172: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