ACS724 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small-Footprint SOIC8 Package FEATURES AND BENEFITS DESCRIPTION AEC-Q100 qualified The Allegro ACS724 current sensor IC is an economical and Differential Hall sensing rejects common-mode fields precise solution for AC or DC current sensing in industrial, 1.2 m primary conductor resistance for low power loss automotive, commercial, and communications systems. The and high inrush current withstand capability small package is ideal for space-constrained applications Integrated shield virtually eliminates capacitive while also saving costs due to reduced board area. Typical coupling from current conductor to die, greatly applications include motor control, load detection and suppressing output noise due to high dv/dt transients management, switched-mode power supplies, and overcurrent Industry-leading noise performance with greatly fault protection. improved bandwidth through proprietary amplifier and The device consists of a precise, low-offset, linear Hall filter design techniques sensor circuit with a copper conduction path located near the High-bandwidth 120 kHz analog output for faster surface of the die. Applied current flowing through this copper response times in control applications conduction path generates a magnetic field which is sensed Filter pin allows user to filter the output for improved by the integrated Hall IC and converted into a proportional resolution at lower bandwidth voltage. The current is sensed differentially in order to reject Patented integrated digital temperature compensation common-mode fields, improving accuracy in magnetically circuitry allows for near closed loop accuracy over noisy environments. The inherent device accuracy is optimized temperature in an open loop sensor through the close proximity of the magnetic field to the Hall Small-footprint, low-profile SOIC8 package suitable for transducer. A precise, proportional voltage is provided by the space-constrained applications low-offset, chopper-stabilized BiCMOS Hall IC, which is Filter pin simplifies bandwidth limiting for better programmed for accuracy after packaging. The output of the resolution at lower frequencies device has a positive slope when an increasing current flows Continued on the next page through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sensing. TV America The internal resistance of this conductive path is 1.2 m typical, Certificate Number: providing low power loss. U8V 18 02 54214 041 CB 14 11 54214 031 CB Certificate Number: The terminals of the conductive path are electrically isolated US-32848-UL from the sensor leads (pins 5 through 8). This allows the PACKAGE: 8-Pin SOIC (suffix LC) ACS724 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. Not to scale Continued on the next page 1 8 VCC IP+ +I P The ACS724 outputs an ACS724 analog signal, V , that IOUT 7 2 changes proportionally VIOUT IP+ with the bidirectional AC I or DC primary sensed P C BYPASS current, I , within the P 6 3 0.1 F specified measurement FILTER IP range. The FILTER pin I P C can be used to decrease LOAD C F the bandwidth in order 4 5 1 nF GND IP to optimize the noise performance. Typical Application ACS724-DS, Rev. 15 June 3, 2019 MCO-0000227Automotive-Grade, Galvanically Isolated Current Sensor IC ACS724 with Common-Mode Field Rejection in a Small-Footprint SOIC8 Package FEATURES AND BENEFITS (continued) DESCRIPTION (continued) 5 V, single supply operation The ACS724 is provided in a small, low-profile surface-mount Output voltage proportional to AC or DC current SOIC8 package. The leadframe is plated with 100% matte tin, Factory-trimmed sensitivity and quiescent output voltage for which is compatible with standard lead (Pb) free printed circuit improved accuracy board assembly processes. Internally, the device is Pb-free, except Chopper stabilization results in extremely stable quiescent for flip-chip high-temperature Pb-based solder balls, currently output voltage exempt from RoHS. The device is fully calibrated prior to shipment Nearly zero magnetic hysteresis from the factory. Ratiometric output from supply voltage SELECTION GUIDE Sens(Typ) I T PR A Part Number at V = 5 V Packing* CC (A) (C) (mV/A) ACS724LLCTR-2P5AB-T 2.5 800 ACS724LLCTR-05AB-T 5 400 ACS724LLCTR-10AU-T 10 400 ACS724LLCTR-10AB-T 10 200 ACS724LLCTR-20AU-T 20 40 to 150 Tape and Reel, 3000 pieces per reel ACS724LLCTR-20AB-T 20 100 ACS724LLCTR-30AU-T 30 133 ACS724LLCTR-30AB-T 30 66 ACS724LLCTR-40AU-T 40 100 ACS724LLCTR-50AB-T 50 40 *Contact Allegro for additional packing options. 2 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com