INA191 - Texas Instruments

INA191 Ultra-Precise Current Sense Amplifier

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 commonmode voltages from –0.2 V to +40 V, independent of the suppl.

Features

• Low power:
  – Supply voltage, VS: 1.7 V to 5.5 V
  – Shutdown current: 100 nA (max INA191)
  – Quiescent current: 43 μA at 25 °C (INA191)
• Low input bias currents: 100 pA (typical) (enables microamp current measurement)
• Bidirectional current measurement (INA2191)
• Accuracy:
  – ±0.25% max gain error (A2 to A5 devices)
  – 7-ppm/°C gain drift (maximum)
  – ±12 μV (maximum) offset voltage
  – 0.13-μV/°C offset drift (maximum)
• Wide common-mode voltage:
  –0.2 V to +40 V
• Gain options:
  – INAx191A1: 25 V/V
  – INAx191A2: 50 V/V
  – INAx191A3: 100 V/V
  – INAx191A4: 200 V/V
  – INAx191A5: 500 V/V
• Packages:
  – IN.