INA190 40 V Bidirectional, Zero-Drift, Voltage Inp

By Texas Instruments 99

INA190 40 V Bidirectional, Zero-Drift, Voltage Inp

Texas Instruments' INA190 devices are voltage-output, current-shunt monitors, also known as current-sense amplifiers. These devices are commonly used for overcurrent protection, precision current measurement for system optimization, or in closed-loop feedback circuits. These amplifiers can sense drops across shunts at common-mode voltages from -0.2 V to +40 V, independent of the supply voltage. Five fixed gains are available including 25 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. The INA190 features low input bias current that permits the use of larger current-sense resistors providing accurate current measurements in the micro-amp range. The low offset voltage of the zero-drift architecture extends the dynamic range of the current measurement. This feature allows for smaller sense resistors with lower power loss while providing accurate current measurements.

These devices operate from a single 1.7 V to 5.5 V power supply drawing a maximum of 65 µA of supply current when enabled and 0.1 µA when disabled. All versions are specified over the extended operating temperature range of -40°C to +125°C and are offered in a UQFN package.

  • Low supply voltage VVS: 1.7 V to 5.5 V
  • Wide common-mode voltage: -0.2 V to +40 V
  • Low shutdown current: 100 nA (max.)
  • Low input bias currents: 500 pA (typ.):
    • Enables micro-amp current measurement
  • Accuracy:
    • Gain error: ±0.2% (A1 devices)
    • Offset drift: 0.13 µV/°C (max.)
    • Gain drift: 5 ppm/°C (max.)
  • Low offset voltage VOS: ±15 µV (max.)
  • Quiescent current: 50 µA at 125°C (typ.)
  • Package: 1.8 mm x 1.4 mm UQFN-10
  • Gain options:
    • INA190A1: 25 V/V
    • INA190A2: 50 V/V
    • INA190A3: 100 V/V
    • INA190A4: 200 V/V
    • INA190A5: 500 V/V
  • Notebook computers
  • Cell phones
  • Battery-powered devices
  • Telecom equipment
  • Power management
  • Battery chargers