MLX91205
IMC-Hall
®
Current Sensor (Triaxis
®
Technology)
3901091205 Page 6 of 14 Data Sheet
Rev 012 June/13
9 Detailed General Description
Melexis IMC current sensor MLX91205 is a single axis magnetic field sensor based on the Hall Effect. It is an
integrated combination of a CMOS Hall circuit and a thin ferromagnetic concentrator. The CMOS circuit
contains two pairs of Hall elements for its sensitivity direction parallel with the chip surface. The ferromagnetic
concentrator amplifies the external magnetic field and concentrates it on the Hall elements.
The MLX91205 is ideally suited for current sensing in harsh automotive and industrial environments for both
AC and DC currents. It produces an analog, linear, ratio-metric output voltage proportional to the applied
magnetic field parallel with the chip surface.
The circuit is fabricated using a standard CMOS process and the ferromagnetic layer is added in a simple
post-processing step. The monolithic device incorporates Hall elements, offset cancellation circuitry, current
source, chopper stabilized amplification circuitry, parameter programming capability.
By dynamic offset cancellation any offset voltage caused by temperature variations, packaging stress or
others is strongly reduced. As a result, the device has an extremely stable signal output, is immune to
mechanical stress and is virtually immune to temperature cycling.
Therefore, the circuit features a wide application range and very high accuracy.
10 Unique Features
Different to other linear Hall sensors the MLX91205 measures the magnetic field parallel with the chip
surface.
Therefore this sensor is ideally used as an open-loop current sensor for PCB mounting. It features small size
application design and a simple construction for various current ranges.
Due to short Response time and high Bandwidth this sensor is suitable for high speed current
measurement in a contactless, high current, high voltage setup.
