Allegro MicroSystems Europe has introduced its first fully integrated, GMR-based current sensor IC with ultra-high sensitivity for applications that require < 5A current sensing.
The ACS70331 current sensor IC incorporates giant magneto-resistive (GMR) technology that is 25 times more sensitive than traditional Hall-effect sensor ICs to sense the magnetic field generated by the current flowing through the low resistance, integrated primary conductor. This new device has been designed to sense very small currents with 1mA resolution in a very low series resistance package of only 1mΩ. This QFN package has an industry best 3mm x 3mm solder footprint, providing a much smaller sensing footprint at a much lower resistance over competitive shunt and op-amp based solutions.
Key applications include handheld and laptop adaptor chargers, radios and walkie talkies, IoT load detection, small surveillance and other motor control applications.