The MLX91221 is a 0-50 A isolated integrated Hall-effect current sensor with dual OCD, operating on a 3.3V supply.

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Top features

  • Factory trimmed AC and DC current sensor

  • Certified voltage isolation as per IEC/UL 62368-1

    • Basic and reinforce isolation

    • 3.55 kV RMS for SOIC-8

    • 5.4 kV RMS for SOIC-16

  • Analog ratiometric or fixed output voltage (internal or external reference)

  • High speed sensing

    • DC to 300 kHz bandwidth

    • 2μs response time

  • Robust against external magnetic field

  • No magnetic hysteresis

  • Double overcurrent detection (SOIC-16)

  • RoHS compliant packages

    • SOIC-8 narrow body

    • SOIC-16 wide

  • Low ohmic losses of integrated conductor

    • 1.09 mΩ SOIC-8

    • 0.89 mΩ SOIC-16

  • AEC-Q100 automotive qualified

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0-50A isolated 3.3V integrated hall current-sensor - MLX91221

Product description

The MLX91221 is a 0-50 A isolated integrated hall-effect current-sensor with dual OCD, operating on a 3.3V supply. It is the easiest all-in-one integrated current sensor with the right balance of small footprint, low impedance, high bandwidth, isolation and more general features.

MLX91220 MLX91221 Block Diagram

The MLX91221 is an integrated current Sensor that senses the current flowing through the leadframe of the package and therefore minimizes the thermal losses encountered with more standard solutions.

Inside the package, the magnetic flux density generated by the current flow is sensed differentially by two sets of Hall plates. As a result the influence of external disturbing fields originating from the dense power electronics surrounding the IC is minimized. The residual signal is amplified to provide a high-speed linear analog output voltage. The close proximity of the Hall plates to the current conductor ensures a high signal-to-noise ratio and an accurate signal over temperature. With this miniaturization, high voltage isolation ratings are still maintained between the primary and their opposing secondary side leads of the package.

The current sensors can operate in two measurement modes:

  • ratiometric mode, addressing the applications mandating output voltage scaling to the supply
  • fixed mode (differential), addressing the use of a reference voltage

Among all the new features integrated, the (dual) overcurrent detection on-chip with a separated output reduced the BoM by reducing the need for external comparators for overcurrent protection.

Factory trimmed (mV/A), the MLX91221 is a plug & play solution. No EoL (End of Line) is required.

MLX91220: operate on a 5 V supply
MLX91221: operate on a 3.3 V supply

A development kit DVK91220 is available, allowing the first application tests without having to customize a PCB.

Applications:

Automotive

  • OBC (On Board Charger)
  • DCDC converter high side
  • PTC heater
  • E-compressor
  • EESM (Electrically Excited Synchronous Motor) low rotor current

Industrial

  • Small electric drives and HVAC compressor
  • Power supplies (Uninterrupted or Switch mode)
  • Solar (Input current and Maximum Power Point Tracking)
  • White goods and demand/load control
  • EVSE (Electric Vehicle Supply Equipment) such as emergency charging cables, AC chargers, DC fast chargers

MLX91220 - MLX91221 applications

Features and benefits

  • Factory trimmed AC and DC current sensor

  • Certified voltage isolation as per IEC/UL 62368-1

    • Basic and reinforce isolation

    • 3.55 kV RMS for SOIC-8

    • 5.4 kV RMS for SOIC-16

  • Analog ratiometric or fixed output voltage (internal or external reference)

  • High speed sensing

    • DC to 300 kHz bandwidth

    • 2μs response time

  • Robust against external magnetic field

  • No magnetic hysteresis

  • Double overcurrent detection (SOIC-16)

  • RoHS compliant packages

    • SOIC-8 narrow body

    • SOIC-16 wide

  • Low ohmic losses of integrated conductor

    • 1.09 mΩ SOIC-8

    • 0.89 mΩ SOIC-16

  • AEC-Q100 automotive qualified

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Isolated integrated current sensor IC MLX91220/21

Product

The second generation of isolated integrated current sensors MLX91220 (5 V) and MLX91221 (3.3 V) are Hall-effect based current sensors that are qualified for use in a range of automotive and industrial applications, such as on-board chargers (OBC), DC/DC converters, power supplies, and small electric drives. With 300 kHz bandwidth, they suit a variety of power conversion applications lower than 50 A RMS.

Practical applications