Texas Instruments INA280/INA280-Q1 Current Sense Amplifier

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

The Texas Instruments INA280/INA280-Q1 operates from a single 2.7V to 20V supply and draws a 370µA supply current (typical). The INA280 has five gain options: 20V/V, 50V/V, 100V/V, 200V/V, and 500V/V. The low offset and drift of the INA280/INA280-Q1 enables accurate current sensing over the extended operating temperature range of -40°C to +125°C. The INA280-Q1 devices are AEC-Q100 qualified for automotive applications.

Features

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

Applications

  • Active antenna system mMIMO (AAS)
  • Macro remote radio unit (RRU)
  • 48V rack server
  • 48V merchant network and server power supply
  • Test and measurement

Simplified Schematic

Block Diagram - Texas Instruments INA280/INA280-Q1 Current Sense Amplifier
Đã phát hành: 2020-12-01 | Đã cập nhật: 2024-10-02