Integrated Current Sensor IC

Integrated Current Sensor IC

Melexis has designed an integrated current sensor that senses the current flowing through the leadframe of the SOIC package. The MLX91210 has low power dissipation of 0.7mΩ to 0.8mΩ. By virtue of fixing the current conductor position with respect to the monolithic CMOS sensor, a fully integrated Hall-effect current sensor is obtained. Inside the package, the magnetic flux density generated by current flow is sensed differentially by two sets of Hall plates. As a result external disturbance is minimized in the fast analog front-end. 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. With this miniaturization, high voltage isolation ratings are still maintained between the primary and their opposing secondary side leads of the package.