INA280-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
• Wide common-mode voltage:
  • Operational voltage: 2.7 V to 120 V
  • Survival voltage: −20 V to +122 V
• Excellent CMRR:
  • 120-dB DC (minimum)
  • 85-dB AC at 50 kHz
• Accuracy
  • Gain:
    • Gain error: ±0.5% (maximum)
    • Gain drift: ±20 ppm/°C (maximum)
  • Offset:
    • Offset voltage: ±150 µV (maximum)
    • Offset drift: ±1 µV/°C (maximum)
• Available gains:
  • INA280A1-Q1: 20 V/V
  • INA280A2-Q1: 50 V/V
  • INA280A3-Q1: 100 V/V
  • INA280A4-Q1: 200 V/V
  • INA280A5-Q1: 500 V/V
• High bandwidth: 1.1 MHz
• Slew rate: 2 V/µs
• Quiescent current: 370 µA

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The INA280-Q1 is a current sense amplifier that can measure voltage drops across shunt resistors over a wide common-mode range from 2.7 V to 120 V. It is in a highly space-efficient SC-70 package with a PCB footprint of only 2.0 mm × 2.1 mm. The current measurement accuracy is achieved thanks to the combination of an ultra-low offset voltage of ±150 µV (maximum), a small gain error of ±0.5% (maximum), and a high DC CMRR of 140 dB (typical). The INA280-Q1 is not only designed for DC current measurement, but also for high-speed applications (like fast overcurrent protection, for example) with a high bandwidth of 1.1 MHz (at gain of 20 V/V) and an 85-dB AC CMRR (at 50 kHz).

The INA280-Q1 operates from a single 2.7-V to 20-V supply and draws a 370-µA supply current (typical). The INA280-Q1 available with five gain options: 20 V/V, 50 V/V, 100 V/V, 200 V/V, and 500 V/V. The low offset and drift of the INA280-Q1 enables accurate current sensing over the extended operating temperature range of −40 °C to +125 °C.