100 kHz Integrated current sensor with high accuracy and common mode field rejection


The MLX91210 is an Integrated Current Sensor that senses the current flowing through half of the leads of the SOIC package. This current conducting copper path exhibits very low power dissipation (0.7 - 0.8mΩ). By virtue of fixing the current conductor position with respect to the monolithic CMOS sensor inside the plastic package, a fully integrated factory calibrated Hall-effect current sensor is obtained.

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 common mode fields is minimized in the fast analog front-end. These external fields originate from the dense power electronics and inductors surrounding the IC or even the earth magnetic field. The residual signal proportional to the current flowing through the leadframe is then amplified to provide a high-speed linear analog output voltage.

The close proximity of the Hall plates to the current conductor ensures a good signal-to-noise ratio and an accurate signal over temperature. The small form factor of the surface mount sensors saves board space and cost, while maintaining high voltage isolation ratings between the primary leads and their opposing secondary side leads of the package.

The product is targeting consumer and industrial applications such as power monitoring in households as well as server farms and motherboards, but also motor control and load detection, power supplies (Uninterrupted & Switched Mode) and overcurrent detection.

Product versions

  • MLX91210 – SOIC8  – 80mV/A or +/-25A sensing range
  • MLX91210 – SOIC8  – 40mV/A or +/-50A sensing range
  • MLX91210 – SOIC16  – 80mV/A or +/-25A sensing range
  • MLX91210 – SOIC16  – 40mV/A or +/-50A sensing range
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100 kHz Integrated current sensor with high accuracy and common mode field rejection - MLX91210

Inspired Engineering

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