The TPA191 series of zero-drift, bi-directional currentsense amplifier can sense voltage drops across shunts atcommon-mode voltages from −0.3 V to 36 V, independentof the supply voltage. Five fixed gains are available:20 V/V, 50 V/V, 75 V/V, 100 V/V, and 200 V/V. Theintegration matched gain resistor network minimizes gainerrors and reduces the temperature drift. The low offsetof the zero-drift architecture enables current sensing withthe maximum drops across the shunt as low as 10-mVfull-scale.
The TPA191 devices operate from a single 2.7-V to 36-V power supply, with drawing a typical of 80-μA supplycurrent. All versions are specified from −40°C 125°C, andoffered in the SOT363 package.