The LTA181 series of bidirectional zero-drift current sense amplifier is designed for cost optimized solution, which can sense drops across shunts at common-mode voltages from –0.2 V to 30 V, independent of the supply voltage. Unidirectional operation allows the LTA181 series to measure currents through a resistive shunt in one direction, while bidirectional operation allows the device to measure currents through a resistive shunt in two directions. The low offset of the zero-drift architecture enables current sensing with maximum drops across the shunt as low as 10mV fullscale.

The LTA181 series operates from a single +2.7 V to +5.5 V power supply, drawing a maximum of 180μA of supply current. The device is specified from –40℃ to +105℃, and offered in SOT23-6L and SC70-6L packages.

• Wide common-mode range: -0.2 V to 30 V

• Maximum ±150 μV Offset voltage at Vcm = 0V

• Accuracy

– Maximum ±1 % Gain Error

– Maximum 1.5 μV/℃ Offset Drift

– Maximum 20 ppm/℃ Gain Drift

• Choice of Gains:

– LTA181A1: 20 V/V

– LTA181A2: 50 V/V

– LTA181A3: 100 V/V

– LTA181A4: 200 V/V

• Quiescent Current: Maximum 180 μA

• Package: SOT23-6L, SC70-6L

• wer Management

• Battery Chargers

• Electrical Cigarette

• Smart Phones and Tablets

• Notebook Computers

• Telecom Equipments

• Welding Equipments