INA253-Q1

• AEC-Q100 qualified for automotive applications:
  • Temperature grade 1: –40 °C to +125 °C, T_A
• Functional Safety-Capable
  • Documentation available to aid functional safety system design
• Precision integrated shunt resistor
  • Shunt resistor: 2 mΩ
  • Shunt inductance: 3 nH
  • 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
• High bandwidth: 350 kHz
• Enhanced PWM rejection
• Excellent CMRR
  • > 120-dB DC CMRR
  • 90-dB AC CMRR at 50 kHz
• Accuracy:
  • Gain:
    • Gain error: 0.4% (maximum)
    • Gain drift: 45 ppm/°C (maximum)
  • Offset:
    • Offset current: ±15 mA (maximum)
    • 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
• Quiescent current: 2.4 mA (maximum)

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The INA253-Q1 is an automotive, voltage-output, current sense amplifier with an integrated shunt resistor of 2 mΩ. The INA253-Q1 monitors bidirectional currents over a wide common-mode range from –4 V to +80 V, independent of the supply voltage. Three fixed gains are available: 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-Q1 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 a motor-drive application, 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. All gain versions are specified over the operating temperature range of –40 °C to +125 °C, and are available in a 20-pin TSSOP package.