The 2.5 µs response time enables overcurrent fault detection in safety-critical applications. This new family can be used in automotive and industrial applications with an accuracy of +/- 2.1% over the IC's lifetime. Both current sensor ICs operate from a single 5 V (ACS772) and 3.3 V (ACS773) power supply.
The device consists of a precision low-offset linear Hall effect circuit with copper conduction located close to the die. The applied current flowing through this copper conduction generates a magnetic field that the Hall effect IC converts into a proportional voltage. The device's accuracy is optimized by the proximity of the magnetic signal to the Hall effect transducer. A precise, proportional voltage output is provided by the low-offset, chopper-stabilized BiCMOS Hall effect IC, factory-programmed for maximum accuracy. Patented digital temperature compensation technology greatly improves the IC's accuracy and temperature stability.
Allegro's patented integrated shielding technology provides high-level immunity to dV/dt current conductors and electrical shunt fields for high-voltage, low-ripple output voltage and high-side (Hs) offset shunt applications. The device output increases when a rising current flows through the primary copper conduction path (from pin 4 to pin 5), which is the path used for current sampling. The internal resistance of this conduction path is typically 100 μΩ, resulting in low power loss. The copper conductor thickness allows the device to survive high overcurrent conditions.
The conduction path terminals are electrically isolated from the signal wires (pins 1 to 3). This allows the ACS772 sensor IC family to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques.
The ACS722 and ACS733 current sensor integrated circuits are provided in a custom Allegro CB package, offering a very small footprint compared to current sensor modules offered by competing solutions. These devices also offer a 2.5 µs response time, the fastest response time offered by an IC in Allegro's custom CB package. They are fully calibrated before shipping from the factory and are lead-free. All leads are 100% matte tin-plated, and there is no lead inside the package. The heavy-gauge frame is made of oxygen-free copper.

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