DESCRIPTION
The MCS1800 is a linear Hall-effect current sensor for AC or DC current sensing. The Hall array is differential, which cancels out any stray magnetic field.
A primary conductor with a low resistance allows current to flow close to the IC, which contains high-accuracy Hall-effect sensors. This current generates a magnetic field that is sensed at two different points by the integrated Hall-effect transducers. The magnetic field difference between these two points is then converted into a voltage that is proportional to the applied current. A spinning current technique is used for a low stable offset.
The galvanic isolation between the pins of the primary conductive path and the sensor leads allows the MCS1800 to replace opto-isolators or other isolation devices.
The MCS1800 requires a minimal number of readily available, standard external components. The device’s small footprint saves board area and makes it well-suited for space-constrained applications. The MCS1800 is available in an SOIC-8 package.

FEATURES
 3.3V Single Supply
 Immune to External Magnetic Fields by Differential Sensing
 200VRMS Working Voltage for Basic Isolation
 Operating Temperature: -40°C to +125°C
 1.2mΩ Internal Conductor Resistance
 ±12.5A and ±25A Range
 Adjustable Bandwidth Up to 100 kHz
 4μs Output Rising Time
 Ratiometric Output from Supply Voltage
 Output Proportional to AC or DC Currents
 Factory-Trimmed for Accuracy
 No Magnetic Hysteresis
 Integrated Shield Suppressing Capacitive Coupling from Current Conductor to Die (Up to 10V/ns)
 Available in an SOIC-8 Package

APPLICATIONS
 Motor Control
 Automotive Systems
 Load Detection and Management
 Switch-Mode Power Supplies
 Over-Current Fault Protection