INA191 Datasheet | Texas Instruments

Features - Low power: - Supply voltage, VS: 1.7 V to 5.5 V - Shutdown current: 100 n A (max INA191) - Quiescent current: 43 μA at 25 °C (INA191) - Low input bias currents: 100 p A (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 mon-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 puters - Cell phones - Battery-powered devices - Tele equipment - Power management - Battery chargers Bus Voltage up to 40 V RSENSE 100 p A 100 p A (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 monly used for overcurrent protection, precision-current measurement for system optimization, or in closed-loop feedback circuits. This device can sense drops across shunts at monmode 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. 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 5.5V power supply, drawing a maximum of 65 µA of supply current when enabled and only 100 n A 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)...