ACS711 Hall Effect Linear Current Sensor with Overcurrent Fault Output for <100 V Isolation Applications Features and Benefits Description No external sense resistor required single package solution The Allegro ACS711 provides economical and precise Reduced Power Loss: solutions for AC or DC current sensing in <100 V audio, 0.6 m internal conductor resistance on EX package communications systems, and white goods. The device package 1.2 m internal conductor resistance on LC package allows for easy implementation by the customer. Typical Economical low- and high-side current sensing applications include circuit protection, current monitoring, Output voltage proportional to AC or DC currents and motor and inverter control. 12.5 A and 25 A full scale sensing ranges on LC package The device consists of a linear Hall sensor circuit with a copper 15.5 A and 31 A full scale sensing ranges on EX package conduction path located near the surface of the die. Applied Overcurrent F A U L T trips and latches at 100% of full-scale current Low-noise analog signal path current flowing through this copper conduction path generates 100 kHz bandwidth a magnetic field which is sensed by the integrated Hall IC Small footprint, low-profile SOIC8 and QFN packages and converted into a proportional voltage. Device accuracy is 3.0 to 5.5 V, single supply operation optimized through the close proximity of the magnetic signal Integrated electrostatic shield for output stability to the Hall transducer. Factory-trimmed for accuracy Extremely stable output offset voltage The output of the device has a positive slope proportional to Zero magnetic hysteresis the current flow from IP+ to IP (pins 1 and 2, to pins 3 and Ratiometric output from supply voltage 4). The internal resistance of this conductive path is 0.6 m for the EX package, and 1.2 m for the LC package, providing Packages: 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 IC leads, providing sufficient internal creepage and clearance dimensions for a low AC or DC working voltage applications. The thickness 8-pin SOICN 12-contact QFN with internally fused path 3 mm 3 mm 0.75 mm (LC package) Continued on the next page (EX package) Approximate Scale 1:1 Typical Application +3.3 V VCC C IP+ BYP 0.1 F IP+ VIOUT C LOAD I ACS711 P R PU FAULT IP IP GND Application 1. The ACS711 outputs an analog signal, V , that varies linearly with the IOUT bi-directional AC or DC primary current, I , within the range specified. The F A U L T pin trips P when I reaches 100% of its full-scale current. P ACS711A-DS, Rev. 2Hall Effect Linear Current Sensor with Overcurrent ACS711 Fault Output for < 100 V Isolation Applications Description (continued) of the copper conductor allows survival of the device at up to 5 assembly processes. Internally, the device is Pb-free, except for overcurrent conditions. flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from The ACS711 is provided in small, surface mount packages: SOIC8 the factory. and QFN12. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board Selection Guide 2 Optimized Accuracy Sensitivity , T A 1 Part Number Range, I Sens (Typ) Package Packing P (C) (A) (mV/A) ACS711ELCTR-12AB-T 40 to 85 12.5 110 ACS711KLCTR-12AB-T 40 to 125 8-pin SOICN 3000 pieces/reel ACS711ELCTR-25AB-T 40 to 85 25 55 ACS711KLCTR-25AB-T 40 to 125 3 ACS711EEXLT-15AB-T 40 to 85 15.5 90 3 ACS711KEXLT-15AB-T 40 to 125 12-contact QFN with 1500 pieces/reel fused current loop 3 ACS711EEXLT-31AB-T 40 to 85 31 45 3 ACS711KEXLT-31AB-T 40 to 125 1 Contact Allegro for additional packing options. 2 Sensitivity measured with V = 3.3 V. CC 3 QFN package not qualified for automotive applications. Absolute Maximum Ratings Characteristic Symbol Notes Rating Units Supply Voltage V 7V CC Reverse Supply Voltage V 0.1 V RCC Output Voltage V 7V IOUT Reverse Output Voltage V 0.1 V RIOUT VAC peak Working Voltage for Basic Isolation V Voltage applied between pins 1-4 and 5-8 100 WORKING or VDC F A U L T Pin V oltage V 7V FAULT Overcurrent Transient Tolerance I 1 pulse, 100 ms 100 A POC Range E 40 to 85 C Nominal Operating Ambient Temperature T A Range K 40 to 125 C Maximum Junction Temperature T (max) 165 C J Storage Temperature T 65 to 170 C stg Allegro MicroSystems, LLC 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com