ACS770
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ACS770xCB Thermally Enhanced, Fully Integrated, Hall Effect-Based High Precision Linear Current Sensor IC with 100 µΩ Current Conductor FEATURES AND BENEFITS • Industry-leading total output accuracy achieved with new piecewise linear digital temperature compensation of offset and sensitivity • Industry-leading noise performance through proprietary amplifier and filter design techniques • 120 kHz typical bandwidth • 4.1 µs output rise time in response to step input current • Integrated shield greatly reduces capacitive coupling from current conductor to die due to high dV/dt signals, and prevents offset drift in high-side, high voltage applications • Greatly improved total output error through digitally programmed and compensated gain and offset over the full operating temperature range • Small package size, with easy mounting capability • Monolithic Hall IC for high reliability • Ultra-low power loss: 100 µΩ internal conductor resistance • Galvanic isolation allows use in economical, high-side current sensing in high voltage systems • 4.5 to 5.5 V, single supply operation • Output voltage proportional to AC or DC currents • Factory-trimmed for accuracy • Extremely stable output offset voltage Continued on the next page… Package: 5-pin package (suffix CB) pe d Ty ste te The Allegro™ ACS770 family of current sensor ICs provides economical and precise solutions for AC or DC current sensing. Typical applications include motor control, load detection and management, power supply and DC-to-DC converter control, inverter control, and overcurrent fault detection. The device consists of a precision, low-offset linear Hall circuit with a copper conduction path located near the die. Applied current flowing through this copper conduction path generates a magnetic field that is concentrated by a low magnetic hysteresis core, then converted by the Hall IC into a proportional voltage. Device accuracy is optimized through the close proximity of the magnetic signal to the Hall transducer. A precise, proportional output voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy at the factory. Proprietary digital temperature compensation technology greatly improves the IC accuracy and temperature stability without influencing the high bandwidth operation of the analog output. High level immunity to current conductor dV/dt and stray electric fields is offered by Allegro proprietary integrated shield technology for low output voltage ripple and low offset drift in high-side, high voltage applications. The output of the device has a positive slope (>VCC/2 for bidirectional devices) when an increasing current flows through the primary copper conduction path (from terminal 4 to terminal 5), which is the path used for current sampling. The internal resistance of this conductive path is 100 µΩ typical, providing low power loss. The thickness of the copper conductor allows survival of the device at high overcurrent conditions. The terminals of the Continued on the next page… Additional leadforms available for qualifying volumes 5V Application 1: the ACS770 outputs an analog signal, VOUT , that varies linearly with the bidirectional AC or DC primary sampled current, IP , within the range specified. RF and CF are for optimal noise management, with values that depend on the application.

Thermally Enhanced, Fully Integrated, Hall Effect-Based High Precision Linear Current Sensor IC with 100 µΩ Current Conductor Features and Benefits (continued) Description (continued) • Undervoltage lockout for VCC below specification • AEC Q-100 automotive qualified • UL certified, File No. E316429 conductive path are electrically isolated from the signal leads (pins 1 through 3). This allows the ACS770 family of sensor ICs to be used in applications requiring electrical isolation without the use of opto-isolators or other costly isolation techniques. The device is fully calibrated prior...

Thermally Enhanced, Fully Integrated, Hall Effect-Based High Precision Linear Current Sensor IC with 100 µΩ Current Conductor SPECIFICATIONS Absolute Maximum Ratings Characteristic Reverse Supply Voltage Forward Output Voltage Forward Supply Voltage Reverse Output Voltage Output Source Current Output Sink Current Storage Temperature Range L Maximum Junction Range E Nominal Operating Ambient Temperature Minimum pull-up resistor of 500 Ω, from VCC to VIOUT Isolation Characteristics Characteristic Dielectric Strength Test Voltage* Agency type-tested for 60 seconds per UL standard 60950-1, 2nd...

Thermally Enhanced, Fully Integrated, Hall Effect-Based High Precision Linear Current Sensor IC with 100 µΩ Current Conductor Programming Control Temperature Sensor EEPROM and Control Logic Dynamic Offset Cancellation Sensitivity Control Offset Control Signal Recovery GND Functional Block Diagram Terminal List Table VIOUT Description Device power supply terminal Pin-out Diagram Signal ground terminal Terminal for current being sampled Terminal for current being sampled Analog output signal Allegro MicroSystems, LLC 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A....

Thermally Enhanced, Fully Integrated, Hall Effect-Based High Precision Linear Current Sensor IC with 100 µΩ Current Conductor COMMON OPERATING CHARACTERISTICS valid at TOP = –40°C to 150°C, CBYP = 0.1 µF, and VCC = 5 V, unless otherwise specified Characteristic Test Conditions Output open Supply Zener Voltage Power-On Delay1,2 Temperature Compensation Power-On Time1 Undervoltage Lockout (UVLO) Threshold1 UVLO Enable/Disable Delay Time1,2 Power-On Reset Voltage1 Rise Time1,2 Propagation Delay Time1,2 TA = 25°C, CBYP = open, VCC Fall Time (5 V to 3 V) = 1 μs TA = 25°C, CBYP = Open, VCC...

Thermally Enhanced, Fully Integrated, Hall Effect-Based High Precision Linear Current Sensor IC with 100 µΩ Current Conductor X050B PERFORMANCE CHARACTERISTICS1: TOP = –40°C to 150°C, CBYP = 0.1 μF, VCC = 5 V, unless otherwise specified Characteristic Primary Sampled Current Symbol SensTA Test Conditions Measured using full scale IP , TA = 25°C Sens(TOP)HT Measured using full scale IP , TOP = 25°C to 150°C Sens(TOP)LT Measured using full scale IP , TOP = –40°C to 25°C Measured using full scale and half scale IP, Sensitivity Drift Over ΔSensLIFE VNOISE ELIN VOE(TA) Electrical Offset...