The INA21x are voltage-output, current-shunt monitors (also called current-sense
amplifiers) that are commonly used for overcurrent protection, precision-current measurement for
system optimization, or in closed-loop feedback circuits. This series of devices can sense drops
across shunts at common-mode voltages from –0.3 V to 26 V, independent of the supply voltage. Six
fixed gains are available: 50 V/V, 75 V/V, 100 V/V, 200 V/V, 500 V/V, or 1000 V/V. The low offset
of the zero-drift architecture enables current sensing with maximum drops across the shunt as low
as 10-mV full-scale.
These devices operate from a single 2.7-V to 26-V power supply, drawing a maximum of 100
µA of supply current. All versions are specified over the extended operating temperature range (–40°C to +125°C), and offered in SC70 and UQFN packages.