描述

The LT199 series of bidirectional zero-drift current sense amplifier can sense drops across shunts at common-mode voltages from -0.3V to 26V, independent of the supply voltage. Unidirectional operation allows the LT199 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 zerodrift architecture enables current sensing with maximum drops across the shunt as low as 10mV full-scale.

The LT199 series operates from a single +2.5V to +18V power supply, drawing a maximum of 100μA of supply current. The device is specified from –40℃ to +105℃, and offered in SC70-6L and TQFN-10L packages.

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优势和特点

  • Wide common-mode range: -0.3V to 26V
  • Maximum 180μV Offset voltage (LT199G2/G3) Enable Shunt Drops of 10mV Full-scale
  • Accuracy
– Maximum ± 0.5% Gain Error
– Maximum 0.5μV/℃ Offset Drift
– Maximum 10ppm/℃ Gain Drift
  • Choice of Gains:
– LT199G1: 50V/V
– LT199G2: 100V/V
– LT199G3: 200V/V
  • Quiescent Current: Maximum 100μA
  • Package: SC70-6L, TQFN-10L

应用

  • Power Management
  • Battery Chargers
  • Electrical Cigarette
  • Smart Phones and Tablets
  • Notebook Computers
  • Telecom Equipments
  • Welding Equipments
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