The INA253 features a 2-mΩ, precision, current-sensing resistor and a 80-V common-mode, zero-drift topology, precision, excellent common-mode rejection ratio (CMRR), and features enhanced pulse width modulation (PWM) rejection current-sensing amplifier integrated into a single package. High precision measurements are enabled through the matching of the shunt resistor value and the current-sensing amplifier gain providing a highly-accurate, system-calibrated solution. Enhanced PWM rejection reduces the effect of common-mode transients on the output signal that are associated with PWM signals. Multiple gain versions are available to allow for the optimization of the desired full-scale output voltage based on the target current range expected in the application.

Figure 2-5 INA253 Block Diagram

The device has following key features:

• Precision integrated shunt resistor
  • Shunt resistor: 2 mΩ
  • Shunt resistor tolerance: 0.1% (maximum)
  • ±15 A continuous from –40°C to 85°C
  • 0°C to 125°C temperature coefficient: 10 ppm/°C
• Accuracy:
  • Gain error: 0.25% (maximum)
  • Gain drift: 10 ppm/°C (maximum)
  • Offset voltage: ±2 mA
  • Offset drift: 125 µA/°C (maximum)
• Wide common-mode range: –4 V to 80 V
• Available gains: 100 mV/A, 200 mV/A, and 400 mV/A