Power

Zero-drift current-shunt monitor with low bias current

17th September 2019
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The INA191 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 optimisation, or in closed-loop feedback circuits. This device can sense drops across shunts at common-mode voltages from -0.2 to +40V, independent of the supply voltage. 

The low input bias current of the INA191 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 to 5.5V power supply, drawing a maximum of 65µA of supply current when enabled and only 100nA when disabled. The device is specified over the operating temperature range of -40 to +125°C, and offered in a DSBGA-6 package.

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