INA181 - Texas Instruments

INA181 Bidirectional low- and high-side voltage output current-sense amplifiers

The INA181, INA2181, and INA4181 (INAx181) current sense amplifiers are designed for costoptimized 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 commonmode voltages from –0.2 V to +26 V, independent of the supply volt.

Features

• Common-mode range (VCM):
  –0.2 V to +26 V
• High bandwidth: 350 kHz (A1 devices)
• Offset voltage:
  – ±150 µV (maximum) at VCM = 0 V
  – ±500 µV (maximum) at VCM = 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) 2 Applications
• Motor control
• Battery monitors and balancers
• Power management
• Lighting control
• Solar inverters Bus Voltage, VCM .