INA190 40 V Bidirectional, Zero-Drift, Voltage Input Current-Sense Amplifier (CSA)

Texas Instruments' INA190 devices are voltage-output, current-shunt monitors, also known as current-sense amplifiers. These devices are commonly used for overcurrent protection, precision current measurement for system optimization, or in closed-loop feedback circuits. These amplifiers can sense drops across shunts at common-mode voltages from -0.2 V to +40 V, independent of the supply voltage. Five fixed gains are available including 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. The INA190 features low input bias current that permits the use of larger current-sense resistors providing accurate current measurements in the micro-amp range. The low offset voltage of the zero-drift architecture extends the dynamic range of the current measurement. This feature allows for smaller sense resistors with lower power loss while providing accurate current measurements.

These devices operate from a single 1.7 V to 5.5 V power supply drawing a maximum of 65 µA of supply current when enabled and 0.1 µA when disabled. All versions are specified over the extended operating temperature range of -40°C to +125°C and are offered in a UQFN package.