GMR-Based Current Sensor
ACS70331
High Sensitivity, 1 MHz, GMR-Based Current Sensor IC in Space-Saving, Low Resistance QFN and SOIC-8 Packages
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Description
ACS70331
High Sensitivity, 1 MHz, GMR-Based Current Sensor IC in Space-Saving, Low Resistance QFN and SOIC-8 Packages
FEATURES AND BENEFITS
High sensitivity current sensor IC for sensing up to 5 A (DC or AC)
1 MHz bandwidth with response time <550 ns Low noise: 8 mA(rms) at 1 MHz Non-ratiometric, analog output proportional to AC and
DC current Single 3.3 V supply operation High DC PSRR enables use with low accuracy
power supplies or batteries (3 to 4.5 V operation) 1.1 mΩ primary conductor resistance results in
low power loss Small surface mount QFN-12 and SOIC-8 packages for
space-constrained applications
PACKAGES
12-contact QFN 3 mm × 3 mm × 0.75 mm
(ES package)
Not to scale
8-contact SOIC (OL package)
DESCRIPTION
The ACS70331 is Allegro’s first integrated, high sensitivity, current sensor IC for <5 A current sensing applications. It incorporates giant magneto-resistive (GMR) technology that is 25 times more sensitive than traditional Hall-effect sensors to sense the magnetic field generated by the current flowing through the low resistance, integrated primary conductor.
The analog output provides a low noise high-speed signal, which is proportional to the current flowing through the primary. The response time of the part is typically 535 ns. The ACS70331 is offered in four factory-programmed sensitivity and offset levels to optimize performance over the desired current measurement range.
The differential configuration of the GMR elements, relative to th...
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