Datasheet ACS71240 (Allegro)

ACS71240 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages FEATURES AND BENEFITS DESCRIPTION
• AEC-Q100 automotive qualified The Allegro™ ACS71240 current sensor IC is an economical • Differential Hall sensing rejects common-mode fields and precise solution for AC or DC current sensing in industrial, • Integrated shield virtually eliminates capacitive coupling automotive, commercial, and communications applications. from current conductor to die, greatly suppressing output The device consists of a precise, low-offset linear Hall sensor noise due to high dv/dt transients circuit with a copper conduction path located near the surface • Industry-leading noise performance with greatly of the die. Applied current flowing through this copper path improved bandwidth through proprietary amplifier and generates a magnetic field which is sensed by the integrated Hall filter design techniques IC and converted into a proportional voltage. The resistance of • High bandwidth 120 kHz analog output for faster the integrated conductor is far less than typical sense resistors, response times in control applications which reduces power loss and improves efficiency. • Patented integrated digital temperature compensation circuitry allows for near closed-loop accuracy over Rejection of external common-mode magnetic fields is temperature in an open loop sensor achieved through differential sensing, enabling high accuracy • Single supply operation with nonratiometric output at in magnetically noisy environments. A precise voltage 3.3 and 5 V options proportional to the measured current is generated by the low- • Overcurrent FAULT available between 50% and 200% IP offset, chopper-stabilized Hall front end. with 1.5 µs (typ) response time Zero ampere output voltage and device sensitivity are • Non-ratiometric output provides immunity to noisy supplies programmed at the Allegro factory to provide a high accuracy • Small footprint QFN-12 with wettable flank and SOIC-8 solution across the full automotive temperature range. suitable for space-constrained automotive applications • 0.6 mΩ (QFN-12) or 1.2 mΩ (SOIC-8) primary The ACS71240 includes an integrated fault comparator for conductor resistance for low power loss and high inrush simplified overcurrent detection. The ultrafast response time current withstand capability provides the system with ample time to detect and protect • UL certified package (SOIC-8 only) for voltage isolation against short-circuit events. The ACS71240 is provided in small, low-profile surface-mount
PACKAGES:
package options: QFN-12 with wettable flank and SOIC-8. The leadframe is plated with 100% matte tin, which is compatible with standard lead (Pb) free printed circuit board assembly processes. Internally, the device is Pb-free, except for flip- chip high-temperature Pb-based solder balls, currently exempt 12-contact QFN with wettable flank 8-pin SOIC from RoHS. The device is fully calibrated prior to shipment 3 mm × 3 mm × 0.75 mm with internally fused path from the factory. (EXB package) Not to scale (LCB package) VCC
SOIC-8 ONLY
IP+ VCC CBYP 0.1 μF IP+ TÜV America Certificate Number: VIOUT U8V 14 11 54214 032 C CB 14 11 54214 031 I LOAD P
ACS71240
RPU FAULT IP–
CB Certificate Number: US-22334-A3-UL
IP– GND
Figure 1: Typical Application
ACS71240-DS, Rev. 1 May 31, 2019 MCO-0000621