Features and Benefits
▪ Factory trimmed AC and DC current sensor
▪ Analog ratiometric or fixed output voltage
▪ Combining sensing element, signal
conditioning & isolation in SOIC package
▪ No application programming required
▪ High speed sensing
▪ DC to 300kHz bandwidth
▪ 2μs response time
▪ Robust against external magnetic fields
▪ No magnetic hysteresis
▪ Double overcurrent detection (SOIC-16)
▪ Low ohmic losses of integrated conductor
▪ 1.09mΩ SOIC-8 / 0.89mΩ SOIC-16
▪ SOIC-8 narrow body and SOIC-16 wide
body package, RoHS compliant
▪ Lead free component, suitable for lead
free soldering profile up to 260°C, MSL3
▪ Rated voltage isolation
▪ 2.4kVRMS for SOIC-8
▪ 4.8kVRMS for SOIC-16

Applications
▪ AC and DC Chargers
▪ Electric Drives
▪ DCDC converters
▪ Solar
▪ Power Supplies
▪ Demand/Load control

Description
The MLX91221 is an Integrated Current Sensor that
senses the current flowing through the low
impedance leadframe of the SOIC package. By
virtue of fixing the current conductor position with
respect to the monolithic CMOS sensor, a fully
integrated Hall-effect current sensor is obtained,
that is factory calibrated.
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 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 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.