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INA2191 Datasheet Ultra-precise Current Sense Amplifier

Manufacturer: Texas Instruments

Overview: INA191, INA2191 SLYS020C – FEBRUARY 2019 – REVISED AUGUST 2021 INAx191 40-V, Bidirectional, Ultra-Precise Current Sense Amplifier With picoamp IB and ENABLE in WCSP Package.

This datasheet includes multiple variants, all published together in a single manufacturer document.

General 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 commonmode 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 currentsense resistors, and thus provides accurate current measurements in the µA range.

Key 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 (.

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