30 A Current Sensor IC ACS711KEX

By Allegro MicroSystems, LLC 70

30 A Current Sensor IC ACS711KEX

Allegro's ACS711KEX 30 A current sensors provide low-side or <100 V sensing applications, the new device can sense up to 30 A continuous current. The IC measures only 3 mm x 3 mm, housed in a 0.75 mm low-profile QFN package. The internal conductor resistance is only 0.6 mΩ, much lower than the sense resistors used in most current sensing configurations. The Allegro sensor IC employs the Hall-effect to measure the current flowing into and out of the package. This makes it immune to variations in conductor resistance due to temperature. The fully-integrated sensor allows the amplifier gain and offset to produce a more accurate solution than in a sense resistor op-amp combination. The advances integrated into this micro-packaged ACS711 means that it can deliver the smallest current sensor footprint available for user applications. At the same time, the device reduces resistive power loss by an order of magnitude, without compromising sensing accuracy over temperature.

  • Extremely stable output, offset voltage, chopper-stabilized internal amplifiers
  • Nearly zero magnetic hysteresis, coreless design improves accuracy and resolution
  • Extremely-small, 3 mm x 3 mm footprint QFN package offering for small PCB area
  • 100 kHz signal bandwidth for higher speed switching applications
  • Factory-trimmed for accuracy
  • 3.3 V, single supply operation compatible with 3.3 V microprocessors
  • Low-noise analog signal path for improved sensing resolution
  • Output voltage proportional to AC or DC currents
  • ±15 A and ±30 A full scale sensing ranges
  • Ratiometric output from supply voltage
  • Short circuit and overpower detection in audio
  • Motor and pump control in white goods
  • General power supply monitoring
  • Lighting

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