ACS725 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package FEATURES AND BENEFITS DESCRIPTION * AEC-Q100 qualified * Differential Hall sensing rejects common-mode fields * 1.2 m primary conductor resistance for low power loss and high inrush current withstand capability * Integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to high dv/dt transients * Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design techniques * High-bandwidth 120 kHz analog output for faster response times in control applications * Filter pin allows user to filter the output for improved resolution at lower bandwidth * Patented integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open-loop sensor * Small footprint, low-profile SOIC8 package suitable for space-constrained applications * Filter pin simplifies bandwidth limiting for better resolution at lower frequencies The AllegroTM ACS725 current sensor IC is an economical and precise solution for AC or DC current sensing in industrial, automotive, commercial, and communications systems. The small package is ideal for space-constrained applications while also saving costs due to reduced board area. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. The device consists of a precise, low-offset, 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. The current is sensed differentially in order to reject common-mode fields, improving accuracy in magnetically noisy environments. The inherent device accuracy is optimized through the close proximity of the magnetic field to the Hall transducer. A precise, proportional voltage is provided by the low-offset, chopper-stabilized BiCMOS Hall IC, which is programmed for accuracy after packaging. The output of the device has a positive slope when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sensing. The internal resistance of this conductive path is 1.2 m typical, providing low power loss. Continued on the next page... TUV America Certificate Number: U8V 18 02 54214 041 CB 14 11 54214 031 CB Certificate Number: US-32848-UL The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS725 current sensor IC to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques. PACKAGE: 8-Pin SOIC (suffix LC) Continued on the next page... Not to scale 1 VCC IP+ +IP 8 ACS725 2 IP+ VIOUT 7 IP 3 IP- FILTER CBYPASS 0.1 F 6 -IP 4 IP- GND 5 CF 1 nF CLOAD The ACS725 outputs an analog signal, VIOUT , that changes, proportionally, with the bidirectional AC or DC primary sensed current, IP , within the specified measurement range. The FILTER pin can be used to decrease the bandwidth in order to optimize the noise performance. Typical Application ACS725-DS, Rev. 13 MCO-0000160 June 3, 2019 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 FEATURES AND BENEFITS (continued) * 3.3 V, single supply operation * Output voltage proportional to AC or DC current * Factory-trimmed sensitivity and quiescent output voltage for improved accuracy * Chopper stabilization results in extremely stable quiescent output voltage * Nearly zero magnetic hysteresis * Ratiometric output from supply voltage DESCRIPTION (continued) The ACS725 is provided in a small, low-profile surface-mount SOIC8 package. 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 from RoHS. The device is fully calibrated prior to shipment from the factory. SELECTION GUIDE Part Number IPR (A) Sens(Typ) at VCC = 3.3 V (mV/A) ACS725LLCTR-05AB-T 5 264 ACS725LLCTR-10AB-T 10 132 ACS725LLCTR-10AU-T 10 264 ACS725LLCTR-20AB-T 20 66 ACS725LLCTR-20AU-T 20 132 ACS725LLCTR-30AB-T 30 44 ACS725LLCTR-30AB-T-H [2] 30 44 ACS725LLCTR-30AU-T 30 88 ACS725LLCTR-40AB-T 40 33 ACS725LLCTR-50AB-T 50 26.4 [1] [2] TA (C) Packing [1] -40 to 150 Tape and Reel, 3000 pieces per reel Contact Allegro for additional packing options. -H denotes 100% cold calibration at the Allegro factory for improved accuracy. Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 2 ACS725 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Units Supply Voltage VCC 6 V Reverse Supply Voltage VRCC -0.1 V Output Voltage VIOUT VCC + 0.5 V Reverse Output Voltage VRIOUT Operating Ambient Temperature TA Range L -0.1 V -40 to 150 C Junction Temperature TJ(max) 165 C Storage Temperature Tstg -65 to 165 C ISOLATION CHARACTERISTICS Characteristic Dielectric Surge Strength Test Voltage Dielectric Strength Test Voltage Working Voltage for Basic Isolation Clearance Creepage Symbol Notes Rating Unit VSURGE Tested 5 pulses at 2/minute in compliance to IEC 61000-4-5 1.2 s (rise) / 50 s (width). 6000 V Agency type-tested for 60 seconds per UL standard 609501 (edition 2). Production tested at VISO for 1 second, in accordance with UL 60950-1 (edition 2). 2400 VRMS VISO Maximum approved working voltage for basic (single) isolation according UL 60950-1 (edition 2) 420 Vpk or VDC 297 Vrms Dcl Minimum distance through air from IP leads to signal leads 4.2 mm Dcr Minimum distance along package body from IP leadds to signal leads 4.2 mm VWVBI THERMAL CHARACTERISTICS Characteristic Symbol Test Conditions* Package Thermal Resistance (Junction to Ambient) RJA Mounted on the Allegro 85-0140 evaluation board with 800 mm2 of 4 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connecting the layers. Performance values include the power consumed by the PCB. Package Thermal Resistance (Junction to Lead) RJL Mounted on the Allegro ASEK725 evaluation board. Value Units 23 C/W 5 C/W *Additional thermal information available on the Allegro website. Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 3 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 VCC VCC Master Current Supply To All Subcircuits Programming Control POR Hall Current Drive CBYPASS 0.1 F EEPROM and Control Logic Temperature Sensor Offset Control IP+ Sensitivity Control Dynamic Offset Cancellation IP+ IP- + - RF(int) + - VIOUT IP- GND CF FILTER Functional Block Diagram Pinout Diagram and Terminal List Table Terminal List Table IP+ 1 8 VCC IP+ 2 7 VIOUT IP- 3 6 FILTER IP- 4 5 GND Package LC, 8-Pin SOICN Pinout Diagram Number Name 1, 2 IP+ Description Terminals for current being sensed; fused internally 3, 4 IP- 5 GND Terminals for current being sensed; fused internally 6 FILTER Terminal for external capacitor that sets bandwidth 7 VIOUT Analog output signal 8 VCC Signal ground terminal Device power supply terminal Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 4 ACS725 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package COMMON ELECTRICAL CHARACTERISTICS [1]: Valid through the full range of TA , VCC = 3.3 V, CF = 0, unless otherwise specified Characteristic Symbol Min. Typ. Max. Unit 3 3.3 3.6 V VCC = 3.3 V, output open - 10 14 mA VIOUT to GND - - 10 nF RL VIOUT to GND 4.7 - - k RIP TA = 25C - 1.2 - m - 1.8 - k Uniform external magnetic field - 40 - dB Supply Voltage VCC Supply Current ICC Output Capacitance Load CL Output Resistive Load Primary Conductor Resistance Internal Filter Resistance [2] Common Mode Field Rejection Ratio Test Conditions RF(int) CMFRR Primary Hall Coupling Factor G1 TA = 25C - 11 - G/A Secondary Hall Coupling Factor G2 TA = 25C - 2.8 - G/A Sensmatch TA = 25C - 1 - % Rise Time tr IP = IP(max), TA = 25C, CL = 1 nF - 3 - s Propagation Delay tpd IP = IP(max), TA = 25C, CL = 1 nF - 2 - s tRESPONSE Hall plate Sensitivity Matching IP = IP(max), TA = 25C, CL = 1 nF - 4 - s Bandwidth BW Small signal -3 dB; CL = 1 nF - 120 - kHz Noise Density IND Input referenced noise density; TA = 25C, CL = 1 nF - 200 - A(rms)/ Hz Noise IN Input referenced noise: CF = 4.7 nF, CL = 1 nF, BW = 18 kHz, TA = 25C - 27 - mA(rms) -1.5 - +1.5 % Response Time Nonlinearity ELIN Through full range of IP Sensitivity Ratiometry Coefficient SENS_RAT_ COEF VCC = 3.0 to 3.6 V, TA = 25C - 1.3 - - Zero Current Output Ratiometry Coefficient QVO_RAT_ COEF VCC = 3.0 to 3.6 V, TA = 25C - 1 - - VOH RL = 4.7 k - VCC - 0.3 - V VOL RL = 4.7 k - 0.3 - V tPO Output reaches 90% of steady-state level, TA = 25C, IP = IPR(max) applied - 80 - s Saturation Voltage [3] Power-On Time Shorted Output to Ground Current Isc(gnd) TA = 25C - 3.3 - mA Shorted Output to VCC Current Isc(vcc) TA = 25C - 45 - mA [1] Device may be operated at higher primary current levels, IP , ambient temperatures, TA , and internal leadframe temperatures, provided the Maximum Junction Temperature, TJ(max), is not exceeded. [2] R F(int) forms an RC circuit via the FILTER pin. [3] The sensor IC will continue to respond to current beyond the range of I until the high or low saturation voltage; however, the nonlinearity in this region will be worse than P through the rest of the measurement range. Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 5 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 xLLCTR-05AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) -5 - 5 A IPR(min) < IP < IPR(max) - 264 - mV/A Unidirectional; IP = 0 A - VCC x 0.5 - V IP = IPR(max); TA = 25C to 150C -2.5 0.9 2.5 % IP = IPR(max); TA = -40C to 25C -6 4 6 % IP = IPR(max); TA = 25C to 150C -1.5 0.9 1.5 % ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Offset Voltage Esens IP = IPR(max); TA = -40C to 25C -5.5 4 5.5 % IP = 0 A; TA = 25C to 150C -15 5 15 mV IP = 0 A; TA = -40C to 25C -30 15 30 mV Esens_drift -3 1 3 % Etot_drift -3 1 3 % VOE LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift Typical values with are 3 sigma values of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [1] [2] Percentage xLLCTR-10AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) -10 - 10 A IPR(min) < IP < IPR(max) - 132 - mV/A Unidirectional; IP = 0 A - VCC x 0.5 - V IP = IPR(max); TA = 25C to 150C -2 0.8 2 % IP = IPR(max); TA = -40C to 25C -6 4 6 % IP = IPR(max); TA = 25C to 150C -1.5 0.8 1.5 % ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS Sensitivity Error Offset Voltage Esens [3] ETOT = ESENS + 100 x VOE/(Sens x IP) IP = IPR(max); TA = -40C to 25C -5.5 4 5.5 % IP = 0 A; TA = 25C to 150C -10 4 10 mV IP = 0 A; TA = -40C to 25C -30 15 30 mV Esens_drift -3 1 3 % Etot_drift -3 1 3 % VOE LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift Typical values with are 3 sigma values of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [1] [2] Percentage Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 6 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 xLLCTR-10AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR 0 - 10 A IPR(min) < IP < IPR(max) - 264 - mV/A Unidirectional; IP = 0 A - VCC x 0.1 - V IP = IPR(max); TA = 25C to 150C -2.5 0.9 2.5 % IP = IPR(max); TA = -40C to 25C -6 4 6 % IP = IPR(max); TA = 25C to 150C -2 0.9 2 % IP = IPR(max); TA = -40C to 25C -5.5 4 5.5 % IP = 0 A; TA = 25C to 150C -15 5 15 mV IP = 0 A; TA = -40C to 25C -30 15 30 mV Esens_drift -3 1 3 % Etot_drift -3 1 3 % Sens VIOUT(Q) ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Offset Voltage Esens VOE LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift Typical values with are 3 sigma values of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [1] [2] Percentage xLLCTR-20AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) 0 - 20 A IPR(min) < IP < IPR(max) - 132 - mV/A Unidirectional; IP = 0 A - VCC x 0.1 - V IP = IPR(max); TA = 25C to 150C -2 0.8 2 % IP = IPR(max); TA = -40C to 25C -6 4 6 % IP = IPR(max); TA = 25C to 150C -1.5 0.8 1.5 % ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Offset Voltage Esens IP = IPR(max); TA = -40C to 25C -5.5 4 5.5 % IP = 0 A; TA = 25C to 150C -10 4 10 mV IP = 0 A; TA = -40C to 25C -30 5 30 mV Esens_drift -3 1 3 % Etot_drift -3 1 3 % VOE LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift Typical values with are 3 sigma values of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [1] [2] Percentage Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 7 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 xLLCTR-20AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit -20 - 20 A - 66 - mV/A Bidirectional; IP = 0 A - VCC x 0.5 - V IP = IPR(max); TA = 25C to 150C -2 0.8 2 % IP = IPR(max); TA = -40C to 25C -6 4 6 % IP = IPR(max); TA = 25C to 150C -1.5 0.8 1.5 % IP = IPR(max); TA = -40C to 25C -5.5 4 5.5 % IP = 0 A; TA = 25C to 150C -10 4 10 mV IP = 0 A; TA = -40C to 25C -30 5 30 mV Esens_drift -3 1 3 % Etot_drift -3 1 3 % NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS Sensitivity Error Esens Offset Voltage VOE [3] ETOT = ESENS + 100 x VOE/(Sens x IP) LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift [1] Typical values with are 3 sigma values of IP , with IP = IPR(max). part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage [3] A single xLLCTR-30AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit -30 - 30 A - 44 - mV/A Bidirectional; IP = 0 A - VCC x 0.5 - V IP = IPR(max); TA = 25C to 150C -2 0.7 2 % IP = IPR(max); TA = -40C to 25C -6 4 6 % IP = IPR(max); TA = 25C to 150C -1.5 0.7 1.5 % IP = IPR(max); TA = -40C to 25C -5.5 4 5.5 % IP = 0 A; TA = 25C to 150C -10 3 10 mV IP = 0 A; TA = -40C to 25C -30 5 30 mV Esens_drift -3 1 3 % Etot_drift -3 1 3 % NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Esens Offset Voltage VOE LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift Typical values with are 3 sigma values of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [1] [2] Percentage Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 8 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 xLLCTR-30AB-H PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = -40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit -30 - 30 A - 44 - mV/A Bidirectional; IP = 0 A - VCC x 0.5 - V IP = IPR(max); TA = 25C to 150C -2 0.7 2 % IP = IPR(max); TA = -40C to 25C -2 1.5 2 % IP = IPR(max); TA = 25C to 150C -1.5 0.7 1.5 % IP = IPR(max); TA = -40C to 25C -1.5 1 1.5 % IP = 0 A; TA = 25C to 150C -10 3 10 mV IP = 0 A; TA = -40C to 25C -10 6 10 mV Esens_drift -3 1 3 % Etot_drift -3 1 3 % NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Esens Offset Voltage VOE LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift [1] Typical values with are 3 sigma values of IP , with IP = IPR(max). part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage [3] A single xLLCTR-30AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR 0 - 30 A IPR(min) < IP < IPR(max) - 88 - mV/A Unidirectional; IP = 0 A - VCC x 0.1 - V IP = IPR(max); TA = 25C to 150C -2 0.8 2 % IP = IPR(max); TA = -40C to 25C -6 4 6 % IP = IPR(max); TA = 25C to 150C -1.5 0.8 1.5 % IP = IPR(max); TA = -40C to 25C -5.5 4 5.5 % IP = 0 A; TA = 25C to 150C -10 4 10 mV IP = 0 A; TA = -40C to 25C -30 5 30 mV Esens_drift -3 1 3 % Etot_drift -3 1 3 % Sens VIOUT(Q) ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE/(Sens x IP) Sensitivity Error Esens Offset Voltage VOE LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift Typical values with are 3 sigma values of IP , with IP = IPR(max). [3] A single part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [1] [2] Percentage Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 9 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 xLLCTR-40AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit -40 - 40 A - 33 - mV/A Bidirectional; IP = 0 A - VCC x 0.5 - V IP = IPR(max); TA = 25C to 150C -2 1 2 % IP = IPR(max); TA = -40C to 25C -6 4 6 % IP = IPR(max); TA = 25C to 150C -1.5 1 1.5 % IP = IPR(max); TA = -40C to 25C -5.5 4 5.5 % IP = 0 A; TA = 25C to 150C -10 3 10 mV IP = 0 A; TA = -40C to 25C -30 5 30 mV Esens_drift -3 1 3 % Etot_drift -3 1 3 % NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS Sensitivity Error Esens Offset Voltage VOE [3] ETOT = ESENS + 100 x VOE/(Sens x IP) LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift [1] Typical values with are 3 sigma values of IP , with IP = IPR(max). part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage [3] A single xLLCTR-50AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = - 40C to 150C, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit -50 - 50 A - 26.4 - mV/A Bidirectional; IP = 0 A - VCC x 0.5 - V IP = IPR(max); TA = 25C to 150C -2 1 2 % IP = IPR(max); TA = -40C to 25C -6 4 6 % IP = IPR(max); TA = 25C to 150C -1.5 1 1.5 % IP = IPR(max); TA = -40C to 25C -5.5 4 5.5 % IP = 0 A; TA = 25C to 150C -10 3 10 mV IP = 0 A; TA = -40C to 25C -30 5 30 mV Esens_drift -3 1 3 % Etot_drift -3 1 3 % NOMINAL PERFORMANCE Current Sensing Range Sensitivity Zero Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS Sensitivity Error Esens Offset Voltage VOE [3] ETOT = ESENS + 100 x VOE/(Sens x IP) LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Total Output Error Lifetime Drift [1] Typical values with are 3 sigma values of IP , with IP = IPR(max). part will not have both the maximum/minimum sensitivity error and maximum/minimum offset voltage, as that would violate the maximum/minimum total output error specification. Also, 3 sigma distribution values are combined by taking the square root of the sum of the squares. See Application Information section. [2] Percentage [3] A single Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 10 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 CHARACTERISTIC PERFORMANCE xLLCTR-10AU Offset Voltage vs. Temperature Zero Current Output Voltage vs. Temperature 20 345 15 Offset Voltage (mV) 350 VIOUT(Q) (mV) 340 335 330 325 320 10 5 0 -5 -10 -15 315 310 -20 -50 0 50 100 150 -50 0 Temperature (C) 50 100 150 Temperature (C) Sensitivity Error vs. Temperature Sensitivity vs. Temperature 1 268 266 Sensitivity Error (%) Sensitivity (mV/A) 0 264 262 260 258 256 254 -1 -2 -3 -4 252 250 -5 -50 0 50 100 -50 150 0 50 100 150 Temperature (C) Temperature (C) Nonlinearity vs. Temperature Total Error at IPR(max) vs. Temperature 1.00 2 0.80 1 0 0.40 Total Error (%) Nonlinearity (%) 0.60 0.20 0.00 -0.20 -0.40 -1 -2 -3 -4 -0.60 -5 -0.80 -6 -1.00 -50 0 50 100 -50 150 Temperature (C) +3 Sigma 0 50 100 150 Temperature (C) Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 11 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 xLLCTR-20AU Offset Voltage vs. Temperature 6.00 334 4.00 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 336 332 330 328 326 324 322 2.00 0.00 -2.00 -4.00 -6.00 -8.00 -10.00 320 -50 0 50 100 -50 150 0 Sensivity vs. Temperature 150 1.5 1 Sensivity Error (%) 133 Sensivity (mV/A) 100 Sensivity Error vs. Temperature 134 132 131 130 129 128 0.5 0 -0.5 -1 -1.5 -2 -2.5 -3 -3.5 127 -4 -50 0 50 100 150 -50 0 Temperature (C) 50 100 150 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1 1 0.8 0.5 0.6 0 0.4 -0.5 Total Error (%) Nonlinearity (%) 50 Temperature (C) Temperature (C) 0.2 0 -0.2 -0.4 -1 -1.5 -2 -2.5 -0.6 -3 -0.8 -3.5 -4 -1 -50 0 50 100 -50 150 +3 Sigma 0 50 100 150 Temperature (C) Temperature (C) Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 12 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 xLLCTR-20AB Offset Voltage vs. Temperature Zero Current Output Voltage vs. Temperature 6 1655 5 1654 4 Offset Voltage (mV) 1656 VIOUT(Q) (mV) 1653 1652 1651 1650 1649 1648 3 2 1 0 -1 -2 -3 1647 1646 -4 1645 -5 -50 0 50 100 -50 150 0 100 150 Temperature (C) Temperature (C) Sensitivity vs. Temperature Sensitivity Error vs. Temperature 67 1 66 0 Sensitivity Error (%) Sensitivity (mV/A) 50 66 65 65 64 -1 -2 -3 -4 64 63 -5 -50 0 50 100 -50 150 0 Temperature (C) 50 100 150 Temperature (C) Nonlinearity vs. Temperature Total Error at IPR(max) vs. Temperature 1 1.00 0.80 0 0.40 Total Error (%) Nonlinearity (%) 0.60 0.20 0.00 -0.20 -0.40 -1 -2 -3 -0.60 -4 -0.80 -1.00 -5 -50 0 50 100 150 -50 Temperature (C) +3 Sigma 0 50 100 150 Temperature (C) Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 13 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 xLLCTR-30AB Offset Voltage vs. Temperature 1656 6 1654 4 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 1652 1650 1648 1646 2 0 -2 -4 1644 -6 -50 0 50 100 150 -50 0 Temperature (C) Sensitivity vs. Temperature 100 150 Sensitivity Error vs. Temperature 45 1 44 0 Sensitivity Error (%) Sensitivity (mV/A) 50 Temperature (C) 44 43 43 -1 -2 -3 -4 42 42 -5 -50 0 50 100 150 -50 0 Temperature (C) 50 100 150 Temperature (C) Total Error at IPR(max) vs. Temperature Nonlinearity vs. Temperature 1 1.00 0.80 0 0.40 Total Error (%) Nonlinearity (%) 0.60 0.20 0.00 -0.20 -0.40 -0.60 -1 -2 -3 -4 -0.80 -5 -1.00 -50 0 50 100 -50 150 50 100 150 Temperature (C) Temperature (C) +3 Sigma 0 Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 14 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 xLLCTR-30AB-H Offset Voltage vs. Temperature Zero Current Output Voltage vs. Temperature 8.00 1658 6.00 Offset Voltage (mV) VIOUT(Q) (mV) 1656 1654 1652 1650 1648 1646 4.00 2.00 0.00 -2.00 -4.00 -6.00 -8.00 -50 0 50 100 150 -50 0 Sensitivity Error (%) Sensitivity (mV/A) 150 3 45 44 43 2 1 0 -1 -2 -3 -50 0 50 100 150 -50 0 Nonlinearity vs. Temperature 100 150 Total Error at IPR(max) vs. Temperature 1 3 0.8 2 0.6 Total Error (%) 0.4 0.2 0 -0.2 -0.4 -0.6 1 0 -1 -2 -0.8 -1 50 Temperature (C) Temperature (C) Nonlinearity (%) 100 Sensitivity Error vs. Temperature Sensitivity vs. Temperature 46 42 50 Temperature (C) Temperature (C) -50 0 50 100 150 -3 Temperature (C) -50 0 50 100 150 Temperature (C) +3 Sigma Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 15 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 xLLCTR-40AB Offset Voltage vs. Temperature 1656 6 1654 4 Offset Voltage (mV) VIOUT(Q) (mV) Zero Current Output Voltage vs. Temperature 1652 1650 1648 1646 2 0 -2 -4 1644 -6 -50 0 50 100 150 -50 0 Temperature (C) Sensitivity vs. Temperature 100 150 Sensitivity Error vs. Temperature 2 33 33 1 Sensitivity Error (%) 33 Sensitivity (mV/A) 50 Temperature (C) 33 33 32 32 32 32 0 -1 -2 -3 -4 32 31 -5 -50 0 50 100 150 -50 0 Temperature (C) 50 100 150 Temperature (C) Nonlinearity vs. Temperature Total Error at IPR(max) vs. Temperature 2 1.00 0.80 1 0.40 Total Error (%) Nonlinearity (%) 0.60 0.20 0.00 -0.20 -0.40 0 -1 -2 -3 -0.60 -4 -0.80 -1.00 -5 -50 0 50 100 150 -50 Temperature (C) +3 Sigma 0 50 100 150 Temperature (C) Average -3 Sigma Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 16 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 CHARACTERISTIC PERFORMANCE ACS724 TYPICAL FREQUENCY RESPONSE ACS724 Frequency Response Magnitude [dB] 5 0 -5 -10 10 1 10 2 10 3 10 4 10 5 10 4 10 5 Frequency [Hz] 50 Phase [] 0 -50 -100 -150 10 1 10 2 10 3 Frequency [Hz] Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 17 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 APPLICATION INFORMATION Estimating Total Error vs. Sensed Current Here, ESENS and VOE are the 3 sigma values for those error terms. If there is an average sensitivity error or average offset voltage, then the average Total Error is estimated as: The Performance Characteristics tables give distribution (3 sigma) values for Total Error at IPR(max); however, one often wants to know what error to expect at a particular current. This can be estimated by using the distribution data for the components of Total Error, Sensitivity Error, and Offset Voltage. The 3 sigma value for Total Error (ETOT) as a function of the sensed current (IP) is estimated as: 2 Total Error (% of Current Measured) ETOT (IP) = ESENS + ( 100 x VOE Sens x IP ETOTAVG (IP) = ESENSAVG + 100 x VOEAVG Sens x IP The resulting total error will be a sum of ETOT and ETOT_AVG. Using these equations and the 3 sigma distributions for Sensitivity Error and Offset Voltage, the Total Error vs. sensed current (IP) is below for the ACS725LLCTR-20AB. As expected, as one goes towards zero current, the error in percent goes towards infinity due to division by zero. 2 ) 8 6 -40C + 3 4 -40C - 3 2 25C + 3 0 25C - 3 -2 85C + 3 -4 85C - 3 -6 -8 0 5 10 15 20 Current (A) Figure 1: Predicted Total Error as a Function of the Sensed Current for the ACS725LLCTR-20AB Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 18 ACS725 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package Thermal Rise vs. Primary Current ASEK724/5 Evaluation Board Layout Self-heating due to the flow-off current should be considered during the design of any current sensing system. The sensor, printed circuit board (PCB), and contacts to the PCB will generate heat as current moves through the system. Thermal data shown in Figure 2 was collected using the ASEK724/5 Evaluation Board (TED-85-0740-003). This board includes 1500 mm2 of 2 oz. copper (0.0694 mm) connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connecting the layers. Top and bottom layers of the PCB are shown below in Figure 3. The thermal response is highly dependent on PCB layout, copper thickness, cooling techniques, and the profile of the injected current. The current profile includes peak current, current "on-time", and duty cycle. While the data presented in this section was collected with direct current (DC), these numbers may be used to approximate thermal response for both AC signals and current pulses. The plot in Figure 2 shows the measured rise in steady-state die temperature of the ACS725 versus DC input current at an ambient temperature, TA, of 25 C. The thermal offset curves may be directly applied to other values of TA. Figure 2: Self Heating in the LA Package Due to Current Flow The thermal capacity of the ACS725 should be verified by the end user in the application's specific conditions. The maximum junction temperature, TJ(MAX) (165C), should not be exceeded. Further information on this application testing is available in the DC and Transient Current Capability application note on the Allegro website. Figure 3: Top and Bottom Layers for ASEK724/5 Evaluation Board Gerber files for the ASEK724/5 evaluation board are available for download from our website. See the technical documents section of the ACS725 device webpage. Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 19 ACS725 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package DEFINITIONS OF ACCURACY CHARACTERISTICS Sensitivity (Sens). The change in sensor IC output in response to a 1 A change through the primary conductor. The sensitivity is the product of the magnetic circuit sensitivity (G / A) (1 G = 0.1 mT) and the linear IC amplifier gain (mV/G). The linear IC amplifier gain is programmed at the factory to optimize the sensitivity (mV/A) for the full-scale current of the device. Nonlinearity (ELIN). The nonlinearity is a measure of how linear the output of the sensor IC is over the full current measurement range. The nonlinearity is calculated as: VIOUT(IPR(max)) - VIOUT(Q) ELIN = 1- * 100(%) 2 * VIOUT(IPR(max)/2) - VIOUT(Q) Increasing VIOUT (V) Accuracy at 25C Only IPR(min) ETOT (IP) = +IP (A) VIOUT(Q) -IP (A) Full Scale IP IPR(max) 0A Accuracy at 25C Only Decreasing VIOUT (V) Accuracy Across Temperature Figure 4: Output Voltage versus Sensed Current +ETOT Offset Voltage (VOE). The deviation of the device output from its ideal quiescent value of 0.5 x VCC (bidirectional) or 0.1 x VCC (unidirectional) due to nonmagnetic causes. To convert this voltage to amperes, divide by the device sensitivity, Sens. Total Output Error (ETOT). The difference between the current measurement from the sensor IC and the actual current (IP), relative to the actual current. This is equivalent to the difference between the ideal output voltage and the actual output voltage, divided by the ideal sensitivity, relative to the current flowing through the primary conduction path: Accuracy at 25C Only Ideal VIOUT Accuracy Across Temperature where VIOUT(IPR(max)) is the output of the sensor IC with the maximum measurement current flowing through it and VIOUT(IPR(max)/2) is the output of the sensor IC with half of the maximum measurement current flowing through it. Zero Current Output Voltage (VIOUT(Q)). The output of the sensor when the primary current is zero. For a unipolar supply voltage, it nominally remains at 0.5 x VCC for a bidirectional device and 0.1 x VCC for a unidirectional device. For example, in the case of a bidirectional output device, VCC = 3.3 V translates into VIOUT(Q) = 1.65 V. Variation in VIOUT(Q) can be attributed to the resolution of the Allegro linear IC quiescent voltage trim and thermal drift. Accuracy Across Temperature Across Temperature 25C Only -IP +IP VIOUT_ideal(IP) - VIOUT (IP) * 100 (%) Sensideal(IP) * IP The Total Output Error incorporates all sources of error and is a function of IP . At relatively high currents, ETOT will be mostly due to sensitivity error, and at relatively low currents, ETOT will be mostly due to Offset Voltage (VOE ). In fact, at IP = 0, ETOT approaches infinity due to the offset. This is illustrated in Figure 4 and Figure 5. Figure 4 shows a distribution of output voltages versus IP at 25C and across temperature. Figure 5 shows the corresponding ETOT versus IP . -ETOT Figure 5: Total Output Error versus Sensed Current Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 20 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 Sensitivity Ratiometry Coefficient (SENS_RAT_COEF). The coefficient defining how the sensitivity scales with VCC. The ideal coefficient is 1, meaning the sensitivity scales proportionally with VCC. A 10% increase in VCC results in a 10% increase in sensitivity. A coefficient of 1.1 means that the sensitivity increases by 10% more than the ideal proportionality case. This means that a 10% increase in VCC results in an 11% increase in sensitivity. This relationship is described by the following equation: Sens(VCC ) = Sens(3.3 V) 1 + (VCC - 3.3 V) * SENS_RAT_COEF 3.3 V This can be rearranged to define the sensitivity ratiometry coefficient as: SENS_RAT_COEF = Sens(VCC ) 3.3 V -1 * (V Sens(3.3 V) CC - 3.3 V) Zero Current Output Ratiometry Coefficient (QVO_RAT_ COEF). The coefficient defining how the zero current output voltage scales with VCC. The ideal coefficient is 1, meaning the output voltage scales proportionally with VCC, always being equal to VCC/2. A coefficient of 1.1 means that the zero current output voltage increases by 10% more than the ideal proportionality case. This means that a 10% increase in VCC results in an 11% increase in the zero current output voltage. This relationship is described by the following equation: VIOUTQ(VCC ) = VIOUTQ(3.3 V) 1 + (VCC - 3.3 V) * QVO_RAT_COEF 3.3 V This can be rearranged to define the zero current output ratiometry coefficient as: QVO_RAT_COEF = VIOUTQ(VCC ) 3.3 V -1 * (VCC - 3.3 V) VIOUTQ(3.3 V) Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 21 ACS725 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package DEFINITIONS OF DYNAMIC RESPONSE CHARACTERISTICS Power-On Time (tPO). When the supply is ramped to its operating voltage, the device requires a finite time to power its internal components before responding to an input magnetic field. Power-On Time, tPO , is defined as the time it takes for the output voltage to settle within 10% of its steady state value under an applied magnetic field, after the power supply has reached its minimum specified operating voltage, VCC(min), as shown in the chart at right. V VCC VCC(typ.) VIOUT 90% VIOUT VCC(min.) t1 t2 tPO t1= time at which power supply reaches minimum specified operating voltage t2= time at which output voltage settles within 10% of its steady state value under an applied magnetic field 0 Rise Time (tr). The time interval between a) when the sensor IC reaches 10% of its full scale value, and b) when it reaches 90% of its full scale value. The rise time to a step response is used to derive the bandwidth of the current sensor IC, in which (-3 dB) = 0.35 / tr. Both tr and tRESPONSE are detrimentally affected by eddy current losses observed in the conductive IC ground plane. Propagation Delay (tpd ). The propagation delay is measured as the time interval a) when the primary current signal reaches 20% of its final value, and b) when the device reaches 20% of its output corresponding to the applied current. (%) 90 Figure 6: Power-On Time (tPO) t Primary Current VIOUT Rise Time, tr 20 10 0 Propagation Delay, tpd t Figure 7: Rise Time (tr) and Propagation Delay (tpd) Response Time (tRESPONSE). The time interval between a) when the primary current signal reaches 90% of its final value, and b) when the device reaches 90% of its output corresponding to the applied current. (%) 90 Primary Current VIOUT Response Time, tRESPONSE 0 Figure 8: Response Time (tRESPONSE) Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com t 22 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package ACS725 PACKAGE OUTLING DRAWING For Reference Only - Not for Tooling Use (Reference MS-012AA) Dimensions in millimeters - NOT TO SCALE Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown 8 0 4.90 0.10 8 0.25 0.17 NNNNNNN 3.90 0.10 6.00 0.20 PPT-AAA LLLLL A 1.04 REF 1 1 2 B 1.27 0.40 0.25 BSC SEATING PLANE Branded Face 0.10 1.75 MAX C 0.51 0.31 SEATING PLANE A 0.25 0.10 1.27 BSC 1.27 0.65 Package Outline Terminal #1 mark area B Branding scale and appearance at supplier discretion C Reference land pattern layout (reference IPC7351 SOIC127P600X175-8M); all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and PCB layout tolerances. 1.27 0.65 8 8 1.27 5.60 7.35 4.20 1.75 7.35 1.575 1 C N = Device part number P = Package Designator T = Device temperature range A = Amperage L = Lot number Belly Brand = Country of Origin GAUGE PLANE C 8X Standard Branding Reference View 2 PCB Layout Reference View 1 Slot in PCB to maintain 4.2 mm creepage once part is on PCB 1 C 2 PCB Layout Reference View 2 For PCB assemblies that cannot support a slotted design, the above stretched footprint may be used. Figure 9: Package LC, 8-Pin SOICN Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 23 ACS725 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection in a Small Footprint SOIC8 Package Revision History Number Change Pages Responsible Date - Initial Release All A. Latham January 19, 2015 1 Added ACS725LLCTR-20AU-T to Selection Guide and Performance Characteristics charts, and corrected Sensitivity Error; added xLLCTR-20AU Characteristic Performance charts. 2, 6-8, 10 A. Latham September 28, 2015 2 Added ACS725LLCTR-30AU-T to Selection Guide and Performance Characteristics charts. 2, 8 A. Latham December 11, 2015 3 Added ACS725LLCTR-50AB-T to Selection Guide and Performance Characteristics charts. 2, 9 W. Bussing March 17, 2017 4 Added AEC-Q100 qualified status 1 W. Bussing June 28, 2017 5 Added ACS725LLCTR-05AB-T and ACS725LLCTR-10AB-T to Selection Guide and Performance Characteristics charts. 2, 5 M. McNally November 15, 2017 6 Updated Clearance and Creepage rating values 3 W. Bussing January 10, 2018 W. Bussing January 23, 2018 Added Dielectric Surge Strength Test Voltage characteristic 2 Added Common Mode Field Rejection Ratio characteristic 5 8 Updated PCB Layout References in Package Outline Drawing 20 W. Bussing March 19, 2018 9 Added Typical Frequency Response plots 16 W. Bussing June 22, 2018 10 Added "Thermal Rise vs. Primary Current" and "ASEK724/5 Evaluation Board Layout" to the Applications Information section 18 W. Bussing July 3, 2018 11 Added ACS725LLCTR-30AB-T-H to Selection Guide and Performance Characteristic Charts. 2, 9, 15 M. McNally July 30, 2018 12 Updated certificate numbers 1 V. Mach December 13, 2018 13 Updated TUV certificate mark 1 M. McNally June 3, 2019 7 Copyright 2019, Allegro MicroSystems. Allegro MicroSystems reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro's products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro's product can reasonably be expected to cause bodily harm. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. Copies of this document are considered uncontrolled documents. For the latest version of this document, visit our website: www.allegromicro.com Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 24