The INA181, INA2181, and INA4181 (INAx181) current sense amplifiers are designed
for cost-optimized applications. These devices are part of a family of
bidirectional, current-sense amplifiers (also called current-shunt monitors) that
sense voltage drops across current-sense resistors at common-mode voltages from –0.2
V to +26 V, independent of the supply voltage. The INAx181 family integrates a matched resistor gain
network in four, fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V.
This matched gain resistor network minimizes gain error and reduces the temperature
drift.These devices operate from a single
2.7-V to 5.5-V power supply. The single-channel INA181 draws a maximum supply current of 260 µA;
whereas, the dual-channel INA2181 draws a
maximum supply current of 500 µA, and the quad-channel INA4181 draws a maximum supply current of 900
µA.The INA181 is available in both the 6-pin, SOT-23
and SC70 packages. The INA2181 is
available in 10-pin, VSSOP and WSON
packages. The
INA4181 is available in a 20-pin,
TSSOP package. All device options are specified over the extended operating
temperature range of –40°C to +125°C.
