ACS722 High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package FEATURES AND BENEFITS DESCRIPTION Patented integrated digital temperature compensation The Allegro ACS722 current sensor IC is an economical and circuitry allows for near closed loop accuracy over precise solution for AC or DC current sensing in industrial, temperature in an open loop sensor commercial, and communications systems. The small package UL60950-1 (ed. 2) certified is ideal for space constrained applications while also saving Dielectric Strength Voltage = 2.4 kVrms costs due to reduced board area. Typical applications include Basic Isolation Working Voltage = 420 Vpk/297 motor control, load detection and management, switched-mode Vrms power supplies, and overcurrent fault protection. Industry-leading noise performance with greatly The device consists of a precise, low-offset, linear Hall improved bandwidth through proprietary amplifier and sensor circuit with a copper conduction path located near the filter design techniques surface of the die. Applied current flowing through this copper Pin-selectable band width: 80 kHz for high bandwidth conduction path generates a magnetic field which is sensed by applications or 20 kHz for low noise performance the integrated Hall IC and converted into a proportional voltage. 0.65 m primary conductor resistance for low power Device accuracy is optimized through the close proximity of the loss and high inrush current withstand capability magnetic field to the Hall transducer. A precise, proportional Small footprint, low-profile SOIC8 package suitable for voltage is provided by the low-offset, chopper-stabilized space-constrained applications BiCMOS Hall IC, which includes Allegros patented digital Integrated shield virtually eliminates capacitive coupling temperature compensation, resulting in extremely accurate from current conductor to die, greatly suppressing output performance over temperature. The output of the device has noise due to high dv/dt transients a positive slope when an increasing current flows through the 3 to 3.6 V, single supply operation primary copper conduction path (from pins 1 and 2, to pins 3 Continued on the next page and 4), which is the path used for current sensing. The internal resistance of this conductive path is 0.65 m typical, providing TV America low power loss. UL Certified File Certificate Number: No.: US-32848-UL U8V 18 02 54214 041 The terminals of the conductive path are electrically isolated CB 14 11 54214 031 from the sensor leads (pins 5 through 8). This allows the Package: 8-pin SOIC (suffix LC) ACS722 current sensor IC to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques. The ACS722 is provided in a small, low profile surface mount SOIC8 package. The leadframe is plated with 100% matte tin, Continued on the next page Not to scale 8 1 The ACS722 outputs an analog IP+ VCC signal, V , that changes, +I IOUT P ACS722 proportionally, with the 7 2 bidirectional AC or DC primary IP+ VIOUT sensed current, I , within P the specified measurement I C P BYPASS range. The BW SEL pin can 6 0.1 F 3 BW SEL IP be used to select one of the I two bandwidths to optimize the P C L noise performance. Grounding 4 5 the BW SEL pin puts the part GND IP in the high bandwidth (80 kHz) mode. Typical Application ACS722-DS, Rev. 4 June 3, 2019 MCO-0000537High Accuracy, Galvanically Isolated Current Sensor IC ACS722 with Small Footprint SOIC8 Package Features and Benefits (continued) Description (continued) Output voltage proportional to AC or DC current which is compatible with standard lead (Pb) free printed circuit Factory-trimmed sensitivity and quiescent output voltage for board assembly processes. Internally, the device is Pb-free, except improved accuracy for flip-chip high-temperature Pb-based solder balls, currently Chopper stabilization results in extremely stable quiescent exempt from RoHS. The device is fully calibrated prior to shipment output voltage from the factory. Nearly zero magnetic hysteresis Ratiometric output from supply voltage Selection Guide Sens(Typ) 1 Part Number I (A) at V = 3.3 V T (C) Packing PR CC A (mV/A) 2 ACS722LLCTR-05AB-T 5 264 2 ACS722LLCTR-10AU-T 10 2 ACS722LLCTR-10AB-T 10 132 2 ACS722LLCTR-20AU-T 20 -40 to 150 Tape and Reel, 3000 pieces per reel 2 ACS722LLCTR-20AB-T 20 66 2 ACS722LLCTR-40AU-T 40 2 ACS722LLCTR-40AB-T 40 33 1 Contact Allegro for additional packing options. 2 Variant not intended for automotive applications. 2 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com