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Texas Instruments INA199/INA199-Q1 Current Shunt Monitors

Texas Instruments INA199/INA199-Q1 Voltage Output Current Shunt Monitors are commonly used for overcurrent protection, precision current measurement for system optimization, or in closed-loop feedback circuits. These devices can sense drops across shunt resistors at common-mode voltages from –0.3V to 26V, independent of the supply voltage. The INA199/INA199-Q1 comes in three fixed gains (50V/V, 100V/V, and 200V/V). The low offset of the zero-drift architecture enables current sensing with maximum drops across the shunt as low as 10mV full-scale. These devices can operate from a single 2.7V to 26V power supply, drawing a maximum of 100µA of supply current. All versions are specified from –40°C to 105°C and are offered in both SC70-6 and thin UQFN-10 packages. The INA199-Q1 devices are AEC-Q100 qualified for automotive applications.

Features

  • –0.3V to 26V wide common-mode range
  • Offset voltage of ±150 µV (max.) (enables shunt drops of 10mV full-scale)
  • Accuracy
    • Gain Error (Maximum Over Temperature):
      • ±1% (C version)
      • ±1.5% (A and B versions)
    • 0.5µV/°C offset drift (max.)
    • 10ppm/°C gain drift (max.)
  • Choice of gains
    • INA199x1: 50V/V
    • INA199x2: 100V/V
    • INA199x3: 200V/V
  • Quiescent current of 100µA (max.)
  • 6-pin SC-70, 10-pin UQFN packages

Applications

  • Notebook computers
  • Cell phones
  • Qi-compliant wireless charging transmitters
  • Telecom equipment
  • Power management
  • Battery chargers

Simplified Schematic

Schematic - Texas Instruments INA199/INA199-Q1 Current Shunt Monitors
Publié le: 2010-05-19 | Mis à jour le: 2025-02-10