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.

•  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

  
  

•  Power Management

•  Battery Chargers

•  Electrical Cigarette

•  Smart Phones and Tablets

•  Notebook Computers

•  Telecom Equipments

•  Welding Equipments