INA191

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 1 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: – INA191: 0.895-mm2 DSBGA – INA2191: 1.79-mm2 DSBGA 2 Applications Notebook computers Cell phones Battery-powered devices Telecom equipment Power management Battery chargers Bus Voltage up to 40 V RSENSE 100 pA 100 pA (typical) (typical) LOAD IN± IN+ 3 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 larg...