Bi-directional, Zero-Drift Current Sense Amplifiers LT199GxA Operates from a Single +2.5V to +18V Power Supply
The LT199GxA series of bidirectional zero-drift current sense amplifier can sense drops across shunts at common-mode voltages from -0.3V to 18V, independent of the supply voltage. Unidirectional operation allows the LT199GxA 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 LT199GxA series operates from a single +2.5V to +18V power supply, drawing a maximum of 300μA of supply current. The device is specified from –40℃ to +105℃ and offered in SC70-6L and TQFN-10L packages.
Features and Benefits
Wide common-mode range: -0.3V to 18V
Maximum 300μV Offset voltage (LT199G2A/G3A) Enable Shunt Drops of 10mV Full-scale
Accuracy:
– Maximum ±1% Gain Error
– Maximum 1μV/℃ Offset Drift
– Maximum 15ppm/℃ Gain Drift
Choice of Gains:
– LT199G1A: 50V/V
– LT199G2A: 100V/V
– LT199G3A: 200V/V
Quiescent Current: Maximum 300μA
Package: SC70-6L, TQFN-10L
Applications
Power Management
Battery Chargers
Electrical Cigarette
Smart Phones and Tablets
Notebook Computers
Telecom Equipments
Welding Equipments
Limiting Value
Electrical Characteristics
TA=+25℃, VS=+5.0V, VIN+=12V, VSENSE=VIN+– VIN–, and VREF=VS/2, unless otherwise noted.
Ordering Information
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