INA253 80 V Bidirectional Current-Sense Amp (CSA)

INA253 80 V Bidirectional Current-Sense Amp (CSA)

Texas Instruments' INA253 voltage-output CSA features an integrated shunt resistor of 2 mΩ and is designed to monitor bidirectional currents over a wide common-mode range from -4 V to +80 V, independent of the supply voltage. There are three fixed gains available including 100 mV/A, 200 mV/A, and 400 mV/A. The integration of the precision resistor with a zero-drift chopped amplifier provides calibration-equivalent measurement accuracy, ultra-low temperature drift performance of 15 ppm/°C, and an optimized kelvin layout for the sensing resistor.

The INA253 is designed with enhanced PWM rejection circuitry to suppress large (dv/dt) signals that enable real-time continuous current measurements. The measurements are critical for in-line current measurements in motor-drive applications and for solenoid valve control applications.

This device operates from a single 2.7 V to 5.5 V power supply drawing a maximum of 3 mA of supply current. The gain versions are specified over the extended operating temperature range (-40°C to +125°C) and are available in a 20-pin TSSOP package.

Features
  • Precision integrated shunt resistor:
    • Shunt resistor: 2 mΩ
    • Shunt inductance: 3 nH
    • Shunt resistor tolerance: 0.1% (max.)
    • ±15 A continuous: -40°C to +85°C
    • 0°C to +125°C temperature coefficient: 10 ppm/°C
  • Excellent CMRR:
    • DC CMRR: >120 dB
    • AC CMRR at 50 kHz: 90 dB
  • Enhanced PWM rejection
  • Accuracy:
    • Gain error: 0.4% (max.)
    • Gain drift: 45 ppm/°C (max.)
    • Offset current: ±15 mA (max)
    • Offset drift: 125 µA/°C (max.)
  • Wide common-mode range: -4 V to +80 V
  • Available gains: 100 mV/A, 200 mV/A, and 400 mV/A
  • Quiescent current: 2.4 mA (max.)
Applications
  • Solenoid and valve controls
  • Transmission controls
  • Motor controls
  • Actuator controls
  • DC/DC converters
  • Remote I/O link controls

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