ACS709 High-Bandwidth, Fast Fault Response Current Sensor IC in Thermally Enhanced Package Features and Benefits Description Industry-leading noise performance with 120 kHz The Allegro ACS709 current sensor IC provides economical bandwidth through proprietary amplifier and filter and precise means for current sensing applications in industrial, design techniques automotive, commercial, and communications systems. The Integrated shield greatly reduces capacitive coupling device is offered in a small footprint surface mount package from current conductor to die due to high dV/dt, and that allows easy implementation in customer applications. prevents offset drift in high-side applications The ACS709 consists of a precision linear Hall sensor integrated Small footprint surface-mount QSOP24 package circuit with a copper conduction path located near the surface High isolation voltage, suitable for line-powered of the silicon die. Applied current flows through the copper applications conduction path, and the analog output voltage from the Hall 1.1 m primary conductor resistance for low power loss sensor IC linearly tracks the magnetic field generated by the User-settable Overcurrent Fault level applied current. The accuracy of the ACS709 is maximized Overcurrent Fault signal typically responds to an with this patented packaging configuration because the Hall overcurrent condition in < 2 s element is situated in extremely close proximity to the current Filter pin capacitor sets analog signal bandwidth to be measured. 2% typical output error 3 to 5.5 V, single supply operation High level immunity to current conductor dV/dt and stray Factory trimmed sensitivity, quiescent output voltage, electric fields, offered by Allegro proprietary integrated shield and associated temperature coefficients technology, provides low output ripple and low offset drift in Chopper stabilization results in extremely stable high-side applications. quiescent output voltage The voltage on the Overcurrent Input (VOC pin) allows Ratiometric output from supply voltage customers to define an overcurrent fault threshold for the device. When the current flowing through the copper conduction Package: 24 pin QSOP (suffix LF) path (between the IP+ and IP pins) exceeds this threshold, Continued on the next page Approximate Scale Typical Application 1 24 IP+ NC 2 V 23 CC IP+ NC Fault EN R 3 H 22 IP+ FAULT EN R , R Sets resistor divider reference for V 4 H L OC 21 IP+ VOC 5 ACS709 R 20 C Noise and bandwidth limiting filter capacitor L F IP+ VCC 6 330 k 19 IP+ FAULT C Fault delay setting capacitor, 22 nF maximum OC I C P 7 OC 18 0.1 F B IP VIOUT V A Use of capacitor required 8 IOUT 17 IP FILTER 9 16 C F B Use of resistor optional IP VZCR 10 1 nF 15 IP GND A 11 IP NC 14 12 13 IP NC ACS709A-DS, Rev. 4High-Bandwidth, Fast Fault Response Current Sensor IC ACS709 in Thermally Enhanced Package Description (continued) outputs. This allows the ACS709 family of sensor ICs to be used the open drain Overcurrent Fault pin will transition to a logic low in applications requiring electrical isolation, without the use of state. Factory programming of the linear Hall sensor IC inside of opto-isolators or other costly isolation techniques. the ACS709 results in exceptional accuracy in both analog and digital output signals. Applications include: Motor control and protection The internal resistance of the copper path used for current sensing is Load management and overcurrent detection typically 1.1 m, for low power loss. Also, the current conduction Power conversion and battery monitoring / UPS systems path is electrically isolated from the low voltage device inputs and Selection Guide I Sens (Typ) T P(LIN) A Part Number Packing* (A) (mV/A) (C) ACS709LLFTR-35BB-T 75 28 (V = 5 V) CC ACS709LLFTR-20BB-T 37.5 56 (V = 5 V) CC 40 to 150 Tape and Reel, 2500 pieces per reel ACS709LLFTR-10BB-T 24 85 (V = 5 V) CC ACS709LLFTR-6BB-T 15 90 (V = 3.3 V) CC *Contact Allegro for packing options. Absolute Maximum Ratings Characteristic Symbol Notes Rating Units Supply Voltage V 8 V CC Filter Pin V 8 V FILTER Analog Output Pin V 32 V IOUT Overcurrent Input Pin V 8 V OC Overcurrent F A U L T Pin V 8 V F A U L T Fault Enable (FAULT EN) Pin V 8 V FAULTEN Voltage Reference Output Pin V 8 V ZCR DC Reverse Voltage: Supply Voltage, Filter, Analog Output, Overcurrent Input, Overcurrent Fault, Fault V 0.5 V Rdcx Enable, and Voltage Reference Output Pins Output Current Source I 3 mA IOUT(Source) Output Current Sink I 1 mA IOUT(Sink) Operating Ambient Temperature T Range L 40 to 150 C A Junction Temperature T (max) 165 C J Storage Temperature T 65 to 170 C stg Isolation Characteristics Characteristic Symbol Notes Rating Unit Agency type-tested for 60 seconds per Dielectric Strength Test Voltage* V 2100 VAC ISO UL standard 1577 For basic (single) isolation per UL standard 1577 Working Voltage for Basic Isolation V for higher continuous voltage ratings, please contact 277 VAC WFSI Allegro * Allegro does not conduct 60-second testing. It is done only during the UL certification process. Allegro MicroSystems, LLC 2 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000 www.allegromicro.com