ACS711
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Hall Effect Linear Current Sensor with Overcurrent Fault Output for <100 V Isolation Applications Features and Benefits ▪ No external sense resistor required; single package solution ▪ Reduced Power Loss: The Allegro™ ACS711 provides economical and precise solutions for AC or DC current sensing in <100 V audio, communications systems, and white goods. The device package allows for easy implementation by the customer. Typical applications include circuit protection, current monitoring, and motor and inverter control. ▫ 0.6 mΩ internal conductor resistance on EX package ▫ 1.2 mΩ internal conductor resistance on LC package ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ 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 on LC package ±15.5 A and ±31 A full scale sensing ranges on EX package ¯ ¯¯¯ Overcurrent ¯ ¯ ¯ ¯ ¯ trips and latches at 100% of full-scale current FAULT Low-noise analog signal path 100 kHz bandwidth Small footprint, low-profile SOIC8 and QFN packages 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 8-pin SOICN with internally fused path (LC package) 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 0.6 mΩ for the EX package, and 1.2 mΩ for the LC package, 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 IC leads, providing sufficient internal creepage and clearance dimensions for a low AC or DC working voltage applications. The thickness Continued on the next page… Application 1. The ACS711 outputs an analog signal, VIOUT , that varies linearly with the ¯ L¯ ¯ bi-directional AC or DC primary current, IP , within the range specified. The ¯ ¯¯¯ ¯ pin trips FAU¯ T when IP reaches ±100% of its full-scale current. ACS711A-DS, Rev. 2

Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications Description (continued) of the copper conductor allows survival of the device at up to 5× overcurrent conditions. 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. The ACS711 is provided in small, surface mount packages: SOIC8 and QFN12. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free...

Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications Functional Block Diagram VCC VCC Master Current Supply Current Fault Comparator Power-on Reset Hall Current Drive Sensitivity Temperature Coefficient Trim Dynamic Offset Cancellation Signal Recovery Sensitivity Trim 0 Ampere Offset Adjust Pin-out Diagrams Terminal List Table Name Signal ground terminal Overcurrent fault; active low Terminals for current being sensed; fused internally Terminals for current being sensed; fused internally Device power supply terminal Analog output signal Allegro...

Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications COMMON OPERATING CHARACTERISTICS Valid across the full range of TA for the LC package and at TA = 25°C for the EX package, VCC = 3.3 V, unless otherwise specified Characteristic Test Conditions ELECTRICAL CHARACTERISTICS Supply Voltage1 Supply Current Output Capacitance Load Output Resistive Load Primary Conductor Resistance VIOUT Rise Time Propagation Delay Time Response Time Internal IP = IPMAX, TA = 25°C, COUT = open IP = IP(max), TA = 25°C, COUT = open IP = IP(max), TA = 25°C, COUT = open...

Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications x12AB PERFORMANCE CHARACTERISTICS for LC package and E Temperature Range1 TA = 25°C and VCC = 3.3 V, unless otherwise specified Characteristic Optimized Accuracy Range Test Conditions Full scale of IP applied for 5 ms, TA = –40°C to 25°C TA = 25°C, no external low pass filter on VIOUT VOE(TA) Electrical Offset Voltage Full scale of IP applied for 5 ms, TA = 25°C to 85°C –12.5 Over full range of IP Characteristic Performance Data for parameter distributions over temperature. 2±3 sigma noise...

Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications x25AB PERFORMANCE CHARACTERISTICS for for LC package and E Temperature Range1 TA = 25°C and VCC = 3.3 V, unless otherwise specified Characteristic Optimized Accuracy Range Test Conditions Full scale of IP applied for 5 ms, TA = –40°C to 25°C TA = 25°C, no external low pass filter on VIOUT Over full range of IP Full scale of IP applied for 5 ms, TA = –40°C to 25°C Full scale of IP applied for 5 ms, TA = 25°C to 125°C TA = 25°C, no external low pass filter on VIOUT Electrical Offset Voltage Full...

Hall Effect Linear Current Sensor with Overcurrent Fault Output for < 100 V Isolation Applications Thermal Characteristics Characteristic Package Thermal Resistance, Junction to Lead Package Thermal Resistance, Junction to Ambient2 Symbol RθJL LC package, mounted on Allegro ASEK 711 evaluation board LC package, mounted on Allegro 85-0404 evaluation board, includes the power consumed by the board EX package, mounted on Allegro 85-0528 evaluation board, includes the power consumed by the board thermal information available on the Allegro website evaluation board has 1500 mm2 of 2 oz. copper...