ACS770xCB Thermally Enhanced, Fully Integrated, Hall-Effect-Based High-Precision Linear Current Sensor IC with 100 Current Conductor DESCRIPTION FEATURES AND BENEFITS Industry-leading total output accuracy achieved with new The Allegro ACS770 family of current sensor ICs provides piecewise linear digital temperature compensation of economical and precise solutions for AC or DC current sensing. offset and sensitivity Typical applications include motor control, load detection and Industry-leading noise performance through proprietary management, power supply and DC-to-DC converter control, amplifier and filter design techniques inverter control, and overcurrent fault detection. 120 kHz typical bandwidth The device consists of a precision, low-offset linear Hall 4.1 s output rise time in response to step input current circuit with a copper conduction path located near the die. Integrated shield greatly reduces capacitive coupling Applied current flowing through this copper conduction from current conductor to die due to high dV/dt signals, path generates a magnetic field that is concentrated by a low and prevents offset drift in high-side, high-voltage magnetic hysteresis core, then converted by the Hall IC into a applications proportional voltage. Device accuracy is optimized through the Greatly improved total output error through digitally close proximity of the magnetic signal to the Hall transducer. programmed and compensated gain and offset over the A precise, proportional output voltage is provided by the full operating temperature range low-offset, chopper-stabilized BiCMOS Hall IC, which is Small package size, with easy mounting capability programmed for accuracy at the factory. Proprietary digital Monolithic Hall IC for high reliability temperature compensation technology greatly improves the Ultralow power loss: 100 internal conductor IC accuracy and temperature stability without influencing the resistance high-bandwidth operation of the analog output. Galvanic isolation allows use in economical, high-side current sensing in high-voltage systems High-level immunity to current conductor dV/dt and stray 4.5 to 5.5 V, single supply operation electric fields is offered by Allegro proprietary integrated shield Output voltage proportional to AC or DC currents technology for low output voltage ripple and low offset drift Factory-trimmed for accuracy in high-side, high-voltage applications. Extremely stable output offset voltage The output of the device has a positive slope (>V /2 for CC Continued on the next page bidirectional devices) when an increasing current flows through the primary copper conduction path (from terminal 4 PACKAGE: 5-pin package (suffix CB) to terminal 5), which is the path used for current sampling. The internal resistance of this conductive path is 100 typical, providing low power loss. Continued on the next page TV America CB Certificate Number: PFF PSF PSS Certificate Number: US-29755-UL Leadform Leadform Leadform U8V 14 05 54214 037 Additional leadforms available for qualifying volumes 5 V 1 4 VCC IP+ C Application 1: the ACS770 outputs an analog BYP signal, V , that varies linearly with the OUT ACS770 0.1 F bidirectional AC or DC primary sampled cur- 2 I GND rent, I , within the range specified. R and P F P C are for optimal noise management, with F C F values that depend on the application. 5 IP 3 VIOUT V OUT R F Typical Application ACS770-DS, Rev. 11 May 28, 2019 MCO-0000205Thermally Enhanced, Fully Integrated, Hall-Effect-Based ACS770xCB High-Precision Linear Current Sensor IC with 100 Current Conductor FEATURES AND BENEFITS (continued) DESCRIPTION (continued) Undervoltage lockout for V below specification The thickness of the copper conductor allows survival of the device CC AEC-Q100 automotive qualified at high overcurrent conditions. The terminals of the conductive path UL certified, File No. US-29755-UL 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 to shipment from the factory. The ACS770 family is lead (Pb) free. All leads are plated with 100% matte tin, and there is no Pb inside the package. The heavy gauge leadframe is made of oxygen-free copper. SELECTION GUIDE Package Sensitivity Primary Sampled Current T OP 1 2 Sens (Typ.) Part Number Current, I Packing P Directionality (C) Terminals Signal Pins (A) (mV/A) ACS770LCB-050B-PFF-T Formed Formed 50 40. Bidirectional ACS770LCB-050U-PFF-T Formed Formed 50 80. Unidirectional ACS770LCB-100B-PFF-T Formed Formed 100 20. Bidirectional 40 to 150 ACS770LCB-100B-PSS-T Straight Straight 100 20 Bidirectional ACS770LCB-100U-PFF-T Formed Formed 100 40. Unidirectional 3 ACS770LCB-100U-PSF-T Straight Formed 100 40. Unidirectional ACS770KCB-150B-PFF-T Formed Formed 150 13.3 Bidirectional 34 pieces ACS770KCB-150B-PSF-T Straight Formed 150 13.3 Bidirectional per tube ACS770KCB-150B-PSS-T Straight Straight 150 13.3 Bidirectional 40 to 125 ACS770KCB-150U-PFF-T Formed Formed 150 26.7 Unidirectional ACS770KCB-150U-PSF-T Straight Formed 150 26.7 Unidirectional ACS770ECB-200B-PFF-T Formed Formed 200 10. Bidirectional ACS770ECB-200B-PSF-T Straight Formed 200 10. Bidirectional 40 to 85 ACS770ECB-200U-PFF-T Formed Formed 200 20. Unidirectional ACS770ECB-200U-PSF-T Straight Formed 200 20. Unidirectional 1 Additional leadform options available for qualified volumes. 2 Contact Allegro for additional packing options. 3 ACS770LCB-100U-PSF-T part variant is in production but has been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and no - tice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change: June 5, 2017. Deadline for receipt of LAST TIME BUY orders: December 31, 2017. For existing customer transition, and for new customers or new applications, contact Allegro. 2 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com