INA181

• Common-mode range (V_CM): –0.2 V to +26 V
• High bandwidth: 350 kHz (A1 devices)
• Offset voltage:
  • ±150 µV (maximum) at V_CM = 0 V
  • ±500 µV (maximum) at V_CM = 12 V
• Output slew rate: 2 V/µs
• Bidirectional current-sensing capability
• Accuracy:
  • ±1% gain error (maximum)
  • 1-µV/°C offset drift (maximum)
• Gain options:
  • 20 V/V (A1 devices)
  • 50 V/V (A2 devices)
  • 100 V/V (A3 devices)
  • 200 V/V (A4 devices)
• Quiescent current: 260 µA maximum (INA181)

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The INA181, INA2181, and INA4181 (INAx181) current sense amplifiers are designed for cost-optimized applications. These devices are part of a family of bidirectional, current-sense amplifiers (also called current-shunt monitors) 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 INAx181 family integrates 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.

These devices operate from a single 2.7-V to 5.5-V power supply. The single-channel INA181 draws a maximum supply current of 260 µA; whereas, the dual-channel INA2181 draws a maximum supply current of 500 µA, and the quad-channel INA4181 draws a maximum supply current of 900 µA.

The INA181 is available in a 6-pin, SOT-23 package. The INA2181 is available in 10-pin, VSSOP and WSON packages. The INA4181 is available in a 20-pin, TSSOP package. All device options are specified over the extended operating temperature range of –40°C to +125°C.