The LT181 series of current sense amplifiers (also called current shunt monitors) are designed for cost-optimized applications, that sense voltage drops across current-sense resistors at common-mode voltages from –0.2 V to +26 V, independent of the supply voltage. The LT181 series integrate a matched resistor gain network in four fixed-gain device options: 20 V/V, 50 V/V, 100 V/V, or 200 V/V. This matched gain resistor network minimizes gain error and reduces the temperature drift.

The LT181 series operate from a single +2.7-V to +5.5-V power supply, drawing a maximum of 110μA of supply current. The device is specified from -40℃ to +125℃, and offered in SOT23-6L packages.

•  Wide common-mode range: –0.2 V to 26 V

•  Offset voltage

  – ±150 μV Maximum at VCM = 0 V

  – ±500 μV Maximum at VCM = 12 V

•  Accuracy

  – Maximum ±1% Gain Error

  – Maximum 1 μV/℃ Offset Drift

•  Gains Options:

  – 20V/V (LT181A1)

  – 50V/V (LT181A2)

  – 100V/V (LT181A3)

  – 200V/V (LT181A4)

•  Output slew rate: 0.7 V/μs

•  Quiescent Current: Maximum 110μA

•  Package: SOT23-6L

  
  

•  Motor Control

•  Battery Monitor, BMS

•  Power Management

•  Lighting Control

•  Over-Current Detection

•  Solar Inverters