描述
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 full- scale. 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.
优势和特点
- 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
应用
- Power Management
- Battery Chargers
- Electrical Cigarette
- Smart Phones and Tablets
- Notebook Computers
- Telecom Equipments
- Welding Equipments
