Bi-directional, Zero-Drift Current Sense Amplifiers LT199GxA Operates from a Single +2.5V to +18V Power Supply

时间： 2023-11-25 来源：Linearin

技术问答

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

T_A=+25℃, V_S=+5.0V, V_IN+=12V, V_SENSE=V_IN+– V_IN–, and V_REF=V_S/2, unless otherwise noted.

Ordering Information

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