ACS711 Hall Effect Linear Current Sensor with Overcurrent Fault Output for <100 V Isolation Applications

The device consists of a linear Hall sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer.

The output of the device has a positive slope proportional to the current flow from IP+ to IP– (pins 1 and 2, to pins 3 and 4). The internal resistance of this conductive path is 1.2 mΩ typical, providing a non-intrusive measurement interface that saves power in applications that require energy efficiency.

The ACS711 is optimized for low-side current sensing applications, although the terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8), providing sufficient internal creepage and clearance dimensions for a low AC or DC working voltage applications. The thickness of the copper conductor allows survival of the device at up to 5× overcurrent conditions.

The ACS711 is provided in a small, surface mount SOIC8 package. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes.

Internally, the device is Pb-free, except for flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory.

Features
•No external sense resistor required; single package solution
•1.2 mΩ internal conductor resistance; reduced power loss
•Economical low- and high-side current sensing
•Output voltage proportional to AC or DC currents
•±12.5 A and ±25 A full scale sensing ranges
•Overcurrent FAULT trips and latches at 100% of full-scale current
•Low-noise analog signal path
•100 kHz bandwidth
•Small footprint, low-profile SOIC8 package
•3.0 to 5.5 V, single supply operation
•Integrated electrostatic shield for output stability
•Factory-trimmed for accuracy
•Extremely stable output offset voltage
•Zero magnetic hysteresis
•Ratiometric output from supply voltage