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描述 Description

The INAx191 is a low-power, voltage-output, current-shunt monitor (also called a current-sense amplifier) that is commonly used for overcurrent protection, precision-current measurement for system optimization, or in closed-loop feedback circuits. This device can sense drops across shunts at common-mode voltages from –0.2 V to +40 V, independent of the supply voltage. The low input bias current of the INAx191 permits the use of larger current-sense resistors, and thus provides accurate current measurements in the µA range. Five fixed gains are available: 25 V/V, 50 V/V, 100 V/V, 200 V/V, or 500 V/V. The low offset voltage of the zero-drift architecture extends the dynamic range of the current measurement, and allows for smaller sense resistors with lower power loss while still providing accurate current measurements.

The INA191 operates from a single 1.7-V to 5.5-V power supply, drawing a maximum of 65 µA of supply current when enabled and only 100 nA when disabled. The device is specified over the operating temperature range of –40 °C to +125 °C, and offered in a DSBGA-6 (INA191) and DSBGA-12 (INA2191) packages.

特性 Features

• Low power:
• Shutdown current: 100 nA (max INA191)
• Low input bias currents: 100 pA (typical) (enables microamp current measurement)
• Accuracy:
• 7-ppm/°C gain drift (maximum)
• 0.13-µV/°C offset drift (maximum)
• Wide common-mode voltage: –0.2 V to +40 V
• INAx191A1: 25 V/V
• INAx191A3: 100 V/V
• INAx191A5: 500 V/V
• Packages:
• INA2191: 1.79-mm2 DSBGA