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Texas Instruments INA750x Current-Sense Amplifier

Texas Instruments INA750x Current-Sense Amplifier is a voltage-output current sense amplifier with an integrated shunt resistor of 800µΩ. It is designed to monitor bidirectional current over a common-mode range of -4V to +110V, independent of the supply voltage. The adjustable gain option assists in optimizing the system's dynamic range. Integrating the Kelvin-connected shunt resistor with a zero-drift chopped amplifier provides calibration equivalent measurement accuracy, ultra-low temperature drift performance of ±35ppm/°C, and an optimized layout for the sensing resistor.

The Texas Instruments INA750x is designed with enhanced PWM rejection circuitry to suppress disturbances from large (dv/dt) common-mode transients and enable real-time continuous current measurements in switching systems. Continuous measurements are critical for inline current measurements in motor-drive and solenoid valve control applications. This device operates from a single 2.7V to 5.5V power supply, drawing a maximum of 4.25mA supply current. All versions are specified over the extended operating temperature range (-40°C to +125°C) and are available in a 14-pin VQFN package.

Features

  • Precision solution with an integrated shunt resistor
    • ±35A continuous current at 25°C
    • ±25A continuous current at 125°C
    • Shunt resistor: 800µΩ
    • Shunt inductance: 2.5nH
  • Wide common-mode voltage range of -4V to +110V
  • Enhanced PWM rejection optimized for systems subject to switching common-mode voltages, which supports switching frequencies up to 125kHz
  • Excellent CMRR
    • 160dB DC CMRR
    • 114dB AC CMRR at 50kHz
  • High measurement accuracy
    • System gain error (max.)
      • Version A: ±0.35%, ±35ppm/°C drift
      • Version B: ±1%, ±100ppm/°C drift
    • Offset voltage (max.)
      • Version A: ±15mA, ±315µA/°C drift
      • Version B: ±125mA, ±625µA/°C drift
  • Adjustable gain with external resistor divider network of 40mV/A to 800mV/A
  • Open-drain temperature alert at TJ of 160°C
  • VQFN-14 package option

Applications

  • Motor drives
  • Solenoids and actuators
  • Injection molding machine
  • Cordless power tools
  • Medical cordless tools
  • Drone propeller speed control

Functional Block Diagram

Block Diagram - Texas Instruments INA750x Current-Sense Amplifier

Evaluation Modules

Texas Instruments INA75xEVM Evaluation Modules

Allows users to evaluate the INA750x and INA751x current-sense amplifiers.

Learn Moreom Texas Instruments INA75xEVM Evaluation Modules View Productsrelaterat till Texas Instruments INA75xEVM Evaluation Modules
Publicerad: 2025-01-27 | Uppdaterad: 2025-08-14