400kHz IMC-Hall® current sensor IC with dual overcurrent detection

MLX91218

The MLX91218 is a high-speed high-accuracy IMC-Hall® current sensor simplifying module designs with a dual OverCurrent Detection functionality, a flexible supply 3.3V/5V and an improved SNR.

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Top features

  • Dual overcurrent detection

    • Internal threshold

    • External threshold

  • Flexible Supply Voltage

    • 5V mode and 3.3V mode (factory selectable)

  • Selectable analog output

    • Ratiometric or fixed (Vref)

  • High speed

    • DC to 400 kHz bandwidth

    • 2µs response time

  • Measurement range 

    • MLX91218 AxV versions (Very high field): for current from 200 to 1200 A

    • MLX91218 AxX versions (eXtra high field): for current from 200 to 2000 A

  • Low noise

  • IMC-Hall® Technology

    • Smaller, lighter solution than conventional Hall solutions.

    • Easy mechanical integration

    • Vertical stacking possible w/ existing control boards (PCBs)

  • End-of-line programmable sensor

  • High linearity down to ±0.5% full scale

  • Very low thermal drift for wide temperature range

    • Offset drift (<5mV)

    • Sensitivity drift (<1.5%)

  • Package RoHS compliant

    • SOIC-8 (DC) package, MSL-3

  • AEC-Q100 – Grade 0 Automotive Qualified

Discover all features
400kHz IMC-Hall® current sensor IC with dual overcurrent detection - MLX91218

Product description

The MLX91218 is a high-speed high-accuracy IMC-Hall® current sensor simplifying module designs with a dual OverCurrent Detection (OCD) functionality, a flexible supply 3.3V/5V and an improved SNR. With the IMC-Hall® technology - using a flexible U-shield for crosstalk immunity - currents can be measured in the ranges of 200A to 2000A.

The MLX91218 is a monolithic Hall-effect sensor based on the IMC-Hall® technology. The sensor provides an analog output voltage proportional to the applied magnetic flux density parallel to the IC surface.

The transfer characteristic of the MLX91218 is factory trimmed over temperature, and is programmable (offset, sensitivity, filtering, internal overcurrent threshold) during end-of-line customer calibration.

With its 400kHz bandwidth and fast response time, it is particularly adapted for high speed applications such as motor control, inverters and converters where fast response time, due to fast switching, is required.

Coming in a SOIC8 package, it includes a second OCD. To be noted that the on-chip overcurrent detection feature allows for board space and cost savings, by reporting an OCD event with active low open-drain output, that can be set within or outside the output linear sensing range.

In a typical current sensing application, the sensor is used in combination with a U-shaped shield which facilitates the mechanical assembly of the current sensor over traditional ferromagnetic cores. This shield is recommended to be laminated for high bandwidth applications. The MLX91218 can then be mounted over the bus bar and separated from it by the PCB. As the shield does not serve the primary purpose of concentration, it can be made smaller and lighter than ferromagnetic cores without losing signal thanks to the integrated magnetic concentrator (IMC). As a result, dense power electronics can be achieved enabling system savings and surface mount assembly.

The MLX91218 is compatible with the PTC04 (DB-HALL05) for mass-production programming.

Application Examples

  • Redundant monitoring of battery-management system (BMS)
  • High Voltage Traction inverters (HV)
    • Phase current measurement
    • DC link current measurement
  • 48V Boost-recuperation machines (48V)
    • Phase current measurement
    • DC link current measurement
  • DCDC Converter
  • Smart Battery Junction Boxes
  • Smart Fuse Overcurrent Detection

XHF and VHF examples with standard shields

XHF and VHF examples with standard shields

  • MLX91218 AxV versions (Very high field): for current from 200 to 1200 A
  • MLX91218 AxX versions (eXtra high field): for current from 200 to 2000 A

MLX91218 block diagram

Features and benefits

  • Dual overcurrent detection

    • Internal threshold

    • External threshold

  • Flexible Supply Voltage

    • 5V mode and 3.3V mode (factory selectable)

  • Selectable analog output

    • Ratiometric or fixed (Vref)

  • High speed

    • DC to 400 kHz bandwidth

    • 2µs response time

  • Measurement range 

    • MLX91218 AxV versions (Very high field): for current from 200 to 1200 A

    • MLX91218 AxX versions (eXtra high field): for current from 200 to 2000 A

  • Low noise

  • IMC-Hall® Technology

    • Smaller, lighter solution than conventional Hall solutions.

    • Easy mechanical integration

    • Vertical stacking possible w/ existing control boards (PCBs)

  • End-of-line programmable sensor

  • High linearity down to ±0.5% full scale

  • Very low thermal drift for wide temperature range

    • Offset drift (<5mV)

    • Sensitivity drift (<1.5%)

  • Package RoHS compliant

    • SOIC-8 (DC) package, MSL-3

  • AEC-Q100 – Grade 0 Automotive Qualified

Videos

Current sensor ICs MLX91218 & MLX91219

Product

The MLX91218 (IMC-HALL®) and the MLX91219 (Conventional Hall) are high-speed high-accuracy current sensor simplifying module designs (such as automotive inverter/converter) with an integrated dual overcurrent detection (OCD) functionality, a flexible supply 3.3V/5V and an improved SNR. Discover more.