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 * Differential Hall sensing rejects common-mode fields * 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 * Patented integrated digital temperature compensation circuitry allows for near closed-loop accuracy over temperature in an open loop sensor * Single supply operation with nonratiometric output at 3.3 and 5 V options * Overcurrent FAULT available between 50% and 200% IP with 1.5s (typ) response time * Non-ratiometric output provides immunity to noisy supplies * Small footprint QFN-12 with wettable flank and SOIC-8 suitable for space-constrained automotive applications * 0.6 m (QFN-12) or 1.2 m (SOIC-8) primary conductor resistance for low power loss and high inrush current withstand capability * UL certified package (SOIC-8 only) for voltage isolation The AllegroTM ACS71240 current sensor IC is an economical and precise solution for AC or DC current sensing in industrial, automotive, commercial, and communications applications. PACKAGES: The ACS71240 is provided in small, low-profile surface-mount 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 flipchip high-temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory. 12-contact QFN with wettable flank 8-pin SOIC 3 mm x 3 mm x 0.75 mm with internally fused path (EXB package) (LCB package) Not to scale 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 path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. The resistance of the integrated conductor is far less than typical sense resistors, which reduces power loss and improves efficiency. Rejection of external common-mode magnetic fields is achieved through differential sensing, enabling high accuracy in magnetically noisy environments. A precise voltage proportional to the measured current is generated by the lowoffset, chopper-stabilized Hall front end. Zero ampere output voltage and device sensitivity are programmed at the Allegro factory to provide a high accuracy solution across the full automotive temperature range. The ACS71240 includes an integrated fault comparator for simplified overcurrent detection. The ultrafast response time provides the system with ample time to detect and protect against short-circuit events. VCC SOIC-8 ONLY TUV America Certificate Number: U8V 14 11 54214 032 CB 14 11 54214 031 CB Certificate Number: US-22334-A3-UL IP+ VCC CBYP 0.1 F IP+ VIOUT IP ACS71240 IP- IP- RPU CLOAD FAULT GND Figure 1: Typical Application ACS71240-DS, Rev. 2 MCO-0000621 July 24, 2019 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 SELECTION GUIDE Part Number Supply Voltage, VCC (V) Optimized Accuracy Range, IPR (A) Sensitivity (Typ) (mV/A) Fault Trip Level (A) ACS71240KEXBLT-010B3 3.3 10 132 10 ACS71240KEXBLT-030B3 3.3 30 44 30 ACS71240KEXBLT-050U5 5.0 50 80 50 ACS71240KEXBLT-010B3-115 3.3 10 132 11.5 ACS71240LLCBTR-010B3 3.3 10 132 10 ACS71240LLCBTR-030B3 3.3 30 44 30 ACS71240LLCBTR-045B5 5 45 44.4 45 ACS71240LLCBTR-050U5 5 50 80 50 [1] Contact Allegro Operating Ambient Temperature Range, TA (C) Package Packing [1] -40 to 125 12-contact QFN with wettable flank (EXB) 1500 pieces per 7-inch reel -40 to 150 8-pin SOIC with internally fused path (LCB) 3000 pieces per 13-inch reel for additional packing options. Naming Specification ACS71240KEXBTR - 010B3 - 115 Custom Fault Level, IFAULT 115 = 115% IPR [blank] = 100% IPR Supply Operating Level, VCC 3 = 3.3 V 5 = 5.0 V Current Polarity B = Bidirectional U = Unidirectional Optimized Accuracy Range, IPR Packing Option LT = 1500 pieces per 7-inch reel (QFN-12 only) TR = 3000 pieces per 13-inch reel (SOIC-8 only) Package Type EXB = QFN-12 Package with Wettable Flank LCB = SOIC-8 Package Operating Temperature Range, TA K = -40C to 125C (QFN-12 only) L = -40C to 150C (SOIC-8 only) Allegro Current Sensor 5-digit part number Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 2 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 ABSOLUTE MAXIMUM RATINGS Characteristic Supply Voltage Symbol Notes Rating Units VCC 6 V Reverse Supply Voltage VCC(R) -0.5 V Output Voltage VIOUT VCC + 0.7 V Reverse Output Voltage VIOUT(R) -0.5 V FAULT Voltage VFAULT 25 V VFAULT(R) -0.5 V Range K (QFN-12 package) -40 to 125 C Range L (SOIC-8 package) -40 to 150 C TJ(MAX) 165 C Tstg -65 to 170 C Reverse FAULT Voltage Operating Ambient Temperature Range Junction Temperature Storage Temperature Range TA ISOLATION CHARACTERISTICS (for SOIC-8 package only) Characteristic Dielectric Surge Strength Test Voltage Dielectric Strength Test Voltage Working Voltage for Basic Isolation Clearance Creepage Symbol Notes Value Units VSURGE Tested 5 pulses at 2/minute in compliance to IEC 61000-4-5 1.2s (rise) / 50s (width). 6000 V VISO Agency type-tested for 60 seconds per UL 60950-1 (edition2); production-tested at VISO for 1 second, in accordance with UL 60950-1 (edition 2) 2400 VRMS VWVBI Maximum approved working voltage for basic (single) isolation according to 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 leads to signal leads 4.2 mm Value Units 100 VPK or VDC ISOLATION CHARACTERISTICS (for QFN-12 package only) Characteristic Working Voltage for Basic [1] Based Isolation [1] Symbol VWVBI Notes Voltage applied between pins 1-4 and 5-12 on characterization. No agency testing was conducted. 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 and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 VCC VIOUT 12 11 PINOUT DIAGRAMS AND TERMINAL LIST TABLES Terminal List Table (QFN-12) 2 9 NC IP- 3 8 NC IP- 4 7 NC Name 1, 2 IP+ Positive terminals for current being sensed; fused internally 3, 4 IP- Negative terminals for current being sensed; fused internally 5 GND FAULT NC 11 VIOUT 12 VCC 6 IP+ Number 5 10 NC 6 GND 1 FAULT IP+ 7, 8, 9, 10 Package EX, 12-Pin QFN Pinout Diagram Description Signal ground terminal Overcurrent fault; active low No connection; connect to ground for optimal ESD performance Analog output signal Device power supply terminal Terminal List Table (SOIC-8) Number Name IP+ Positive terminals for current being sensed; fused internally Negative terminals for current being sensed; fused internally IP+ 1 8 VCC 1, 2 IP+ 2 7 VIOUT 3, 4 IP- IP- 3 6 FAULT IP- 4 5 GND 5 GND Description Signal ground terminal 6 FAULT Overcurrent fault; active low 7 VIOUT Analog output signal 8 VCC Device power supply terminal Package LC, 8-Pin SOIC Pinout Diagram Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 4 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Master Current Supply To All Subcircuits VCC Power On Reset Temperature Sensor EEPROM and Control Logic Programming Control FAULT Fault Delay Logic Hall Current Drive Sensitivity Control IP+ IP+ Offset Control Fault Comparator Dynamic Offset Cancellation VIOUT IP- IP- GND Functional Block Diagram 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 and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 COMMON ELECTRICAL CHARACTERISTICS: Valid through the full range of TA and VCC, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit 5 V variant 4.5 5.0 5.5 V 3.3 V variant 3.0 3.3 3.6 V ELECTRICAL CHARACTERISTICS Supply Voltage VCC Supply Current ICC 5 V variant, no load on VIOUT - 10 12 mA 3.3 V variant, no load on VIOUT - 7.5 12 mA Output Capacitance Load CL VIOUT to GND - - 4.7 nF Output Resistive Load RL VIOUT to GND 10 - - k Primary Conductor Resistance RIP TA = 25C QFN-12 package - 0.6 - m SOIC-8 package - 1.2 - m Primary Hall Coupling Factor G1 TA = 25C QFN-12 package - 10 - G/A SOIC-8 package - 11 - G/A Secondary Hall Coupling Factor G2 TA = 25C Hall Plate Sensitivity Matching Common Mode Field Rejection Sensmatch CMFR QFN-12 package - -2 - G/A SOIC-8 package - -2.8 - G/A - 1 - % QFN-12 package - 1.2 - mA/G SOIC-8 package - 0.6 - mA/G TA = 25C Offset due to DC common field Rise Time tr TA = 25C, CL = 1 nF; input current step causing 1V output swing - 3 4 [2] s Propagation Delay tpd TA = 25C, CL = 1 nF; input current step causing 1V output swing - 1.6 2.2 [2] s tRESPONSE TA = 25C, CL = 1 nF; input current step causing 1V output swing - 4 4.9 [2] s Small signal -3dB; CL = 1 nF - 120 - kHz VCC = 5.0 V, input referred, TA = 25C, CL = 1 nF - 100 - ARMS/ Hz Response Time Bandwidth Noise Density Noise Nonlinearity Power Supply Rejection Ratio Output Saturation Voltage[3] Power-On Time BW IND IN ELIN PSRR VCC = 3.3 V, input referred, TA = 25C, CL = 1 nF ARMS/ Hz 150 VCC = 5.0 V, input referred, TA = 25C, CL = 1 nF - 52 - mARMS VCC = 3.3 V, input referred, TA = 25C, CL = 1 nF - 78 - mARMS Up to IP = 10 A QFN-12 package -1 - 1 % Through full range of IP SOIC-8 package -1 - 1 % VCC = VCC 10%, TA = 25C, DC to 1 kHz - 40 - dB VCC = VCC 10%, TA = 25C, 1 kHz to 20 kHz - 30 - dB VCC = VCC 10%, TA = 25C, 20 kHz to 60 kHz - 20 - dB VSAT_H RL = 10 k VCC - 0.3 - - V VSAT_L RL = 10 k - - 0.3 V Output reaches 90% of steady-state level, TA = 25C, IP = IPR(max) applied - 80 - s tPO Shorted Output-to-Ground Current ISC(GND) TA = 25C - 30 - mA Shorted Output-to-VCC Current ISC(VCC) TA = 25C - 1.8 - mA Continued on next page... 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 and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 COMMON ELECTRICAL CHARACTERISTICS (continued): Valid through the full range of TA and VCC, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit - 1 x IPR [4] - A FAULT CHARACTERISTICS FAULT Operating Point IFAULT FAULT Current Hysteresis IF(HYS) FAULT Output Pullup Resistor RPU FAULT Output Voltage VOL Percent of IPR(MAX) 3 5 - % 10 - 500 k - - 0.3 V - 1.5 2.5 [5] s IFAULT, TA = 25C -10 3.5 10 % TA = -40C or TA(MAX) -10 5 10 % RPU = 10 k, during fault condition Time from |IP| rising above |IFAULT| until VFAULT < FAULT Response Time tFAULT VOL(MAX). 100 pF from FAULT to GND. Input current step 20% above IFAULT with rise time 1 s. FAULT Error EF [1] Typical values with are 3 sigma values. Guaranteed by design. Limit calculated using 6sigma. Not tested in production. [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. [4] Unless otherwise specified, contact Allegro for alternative fault levels. Available from 0.5 to 2 x I . PR [5] Not tested in production. [2] 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 and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 ACS71240KEXBLT-010B3 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 3.3V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit -10 - 10 A NOMINAL PERFORMANCE Optimized Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens IPR(min) < IP < IPR(max) - 132 - mV/A VIOUT(Q) Bidirectional, IP = 0 A - 1.65 - V ACCURACY PERFORMANCE Total Output Error [2] ETOT IP = 10 A, TA = 25C to 125C -2.5 1.4 2.5 % IP = 10 A, TA = -40C to 25C -6 1.8 6 % IP = 10 A, TA = 25C to 125C -2 1.1 2 % TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE / (Sens x IP) Sensitivity Error Offset Voltage Error ESENS VOE IP = 10 A, TA = -40C to 25C -5.5 1.7 5.5 % IP = 0 A, TA = 25C to 125C -15 9.7 15 mV IP = 0 A, TA = -40C to 25C -30 8.5 30 mV ACCURACY PERFORMANCE INCLUDING LIFETIME DRIFT [4] Total Output Error Including Lifetime Drift [5] ETOT_drift Sensitivity Error Including Lifetime Drift [6] ESENS_drift Offset Voltage Error Including Lifetime Drift [7] VOE_drift IP = 10 A, TA = 25C to 125C -5.7 1.8 5.7 % IP = 10 A, TA = -40C to 25C -6 1.5 6 % IP = 10 A, TA = 25C to 125C -5.1 1.2 5.1 % IP = 10 A, TA = -40C to 25C -5.6 1.2 5.6 % IP = 0 A, TA = 25C to 125C -28 4.5 28 mV IP = 0 A, TA = -40C to 25C -30 4.3 30 mV Typical values with are 3 sigma values, except for lifetime drift, which are the average value including drift (from the worst case stress) after AEC-Q100 qualification. Percentage of IP. [3] A single device 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. [4] Lifetime drift characteristics are based on AEC-Q100 qualification results. [5] All devices stayed within min/max limits throughout AEC-Q100 qualification. The worst drift observed was 6.1%. [6] All devices stayed within min/max limits throughout AEC-Q100 qualification. The worst drift observed was 4%. [7] All devices stayed within min/max limits throughout AEC-Q100 qualification. The worst drift observed was 22mV. [1] [2] ACS71240KEXBLT-010B3-115 Variant Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit - 1.15 x IPR - A NON-STANDARD FAULT CHARACTERISTICS FAULT Operating Point [1] Typical IFAULT values with are 3 sigma values 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 and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 ACS71240KEXBLT-030B3 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 3.3V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit -30 - 30 A NOMINAL PERFORMANCE Optimized Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens IPR(min) < IP < IPR(max) - 44 - mV/A VIOUT(Q) Bidirectional, IP = 0 A - 1.65 - V ACCURACY PERFORMANCE Total Output Error [2] ETOT IP = 10 A, TA = 25C to 125C -2.5 0.8 2.5 % IP = 10 A, TA = -40C to 25C -6 1.9 6 % IP = 10 A, TA = 25C to 125C -2 0.9 2 % TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE / (Sens x IP) Sensitivity Error Offset Voltage Error ESENS VOE IP = 10 A, TA = -40C to 25C -5.5 1.5 5.5 % IP = 0 A, TA = 25C to 125C -15 3.71 15 mV IP = 0 A, TA = -40C to 25C -30 7.1 30 mV ACCURACY PERFORMANCE INCLUDING LIFETIME DRIFT [4] Total Output Error Including Lifetime Drift [5] ETOT_drift Sensitivity Error Including Lifetime Drift [6] ESENS_drift Offset Voltage Error Including Lifetime Drift [7] VOE_drift IP = 10 A, TA = 25C to 125C -5.7 1.8 5.7 % IP = 10 A, TA = -40C to 25C -6 1.5 6 % IP = 10 A, TA = 25C to 125C -5.1 1.2 5.1 % IP = 10 A, TA = -40C to 25C -5.6 1.2 5.6 % IP = 0 A, TA = 25C to 125C -28 4.5 28 mV IP = 0 A, TA = -40C to 25C -30 4.3 30 mV Typical values with are 3 sigma values, except for lifetime drift, which are the average value including drift (from the worst case stress) after AEC-Q100 qualification. Percentage of IP. [3] A single device 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. [4] Lifetime drift characteristics are based on AEC-Q100 qualification results. [5] All devices stayed within min/max limits throughout AEC-Q100 qualification. The worst drift observed was 6.1%. [6] All devices stayed within min/max limits throughout AEC-Q100 qualification. The worst drift observed was 4%. [7] All devices stayed within min/max limits throughout AEC-Q100 qualification. The worst drift observed was 22mV. [1] [2] 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 and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 ACS71240KEXBLT-050U5 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 5.0V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit 0 - 50 A NOMINAL PERFORMANCE Optimized Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens VIOUT(Q) IPR(min) < IP < IPR(max) - 80 - mV/A Unidirectional, IP = 0 A - 0.5 - V ACCURACY PERFORMANCE Total Output Error [2] ETOT IP = 10 A, TA = 25C to 125C -2.5 1.2 2.5 % IP = 10 A, TA = -40C to 25C -6 3.6 6 % IP = 10 A, TA = 25C to 125C -2 0.9 2 % TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE / (Sens x IP) Sensitivity Error Offset Voltage Error ESENS VOE IP = 10 A, TA = -40C to 25C -5.5 3.3 5.5 % IP = 0 A, TA = 25C to 125C -10 4.6 10 mV IP = 0 A, TA = -40C to 25C -30 6.3 30 mV ACCURACY PERFORMANCE INCLUDING LIFETIME DRIFT [4] Total Output Error Including Lifetime Drift [5] ETOT_drift Sensitivity Error Including Lifetime Drift [6] ESENS_drift Offset Voltage Error Including Lifetime Drift [7] VOE_drift IP = 10 A, TA = 25C to 125C -5.7 1.8 5.7 % IP = 10 A, TA = -40C to 25C -6 1.5 6 % IP = 10 A, TA = 25C to 125C -5.1 1.2 5.1 % IP = 10 A, TA = -40C to 25C -5.6 1.2 5.6 % IP = 0 A, TA = 25C to 125C -28 4.5 28 mV IP = 0 A, TA = -40C to 25C -30 4.3 30 mV Typical values with are 3 sigma values, except for lifetime drift, which are the average value including drift (from the worst case stress) after AEC-Q100 qualification. Percentage of IP. [3] A single device 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. [4] Lifetime drift characteristics are based on AEC-Q100 qualification results. [5] All devices stayed within min/max limits throughout AEC-Q100 qualification. The worst drift observed was 6.1%. [6] All devices stayed within min/max limits throughout AEC-Q100 qualification. The worst drift observed was 4%. [7] All devices stayed within min/max limits throughout AEC-Q100 qualification. The worst drift observed was 22mV. [1] [2] 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 and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 ACS71240LLCBTR-010B3 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 3.3V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit -10 - 10 A NOMINAL PERFORMANCE Optimized Sensing Range IPR Sensitivity Zero-Current Output Voltage Sens IPR(min) < IP < IPR(max) - 132 - mV/A VIOUT(Q) Bidirectional, IP = 0 A - 1.65 - V IP = IPR(max), TA = 25C to 150C -2 1 2 % IP = IPR(max), TA = -40C to 25C -6 2.4 6 % IP = IPR(max), TA = 25C to 150C -1.5 0.84 1.5 % ACCURACY PERFORMANCE Total Output Error [2] TOTAL OUTPUT ERROR ETOT COMPONENTS [3] Sensitivity Error Offset Voltage Error ESENS VOE ETOT = ESENS + 100 x VOE / (Sens x IP) IP = IPR(max), TA = -40C to 25C -5.5 2.3 5.5 % IP = 0 A, TA = 25C to 150C -10 6.7 10 mV IP = 0 A, TA = -40C to 25C -30 10 30 mV Typical values with are 3 sigma values. All devices stayed within limits during AEC-Q100 qualification. Percentage of IP, with IP = IPR(max). [3] A single device 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. [1] [2] ACS71240LLCBTR-030B3 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 3.3V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Optimized Sensing Range Sensitivity Zero-Current Output Voltage IPR -30 - 30 A Sens IPR(min) < IP < IPR(max) - 44 - mV/A VIOUT(Q) Bidirectional, IP = 0 A - 1.65 - V IP = IPR(max), TA = 25C to 150C -2 0.6 2 % IP = IPR(max), TA = -40C to 25C -6 1.4 6 % IP = IPR(max), TA = 25C to 150C -1.9 0.53 1.9 % IP = IPR(max), TA = -40C to 25C -5.5 1.1 5.5 % IP = 0 A, TA = 25C to 150C -10 7.2 10 mV IP = 0 A, TA = -40C to 25C -30 9.5 30 mV ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE / (Sens x IP) Sensitivity Error Offset Voltage Error ESENS VOE Typical values with are 3 sigma values. All devices stayed within limits during AEC-Q100 qualification. Percentage of IP, with IP = IPR(max). [3] A single device 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. [1] [2] 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 and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 ACS71240LLCBTR-045B5 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 5V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit -45 - 45 A NOMINAL PERFORMANCE Optimized Sensing Range IPR Sensitivity Zero-Current Output Voltage Sens IPR(min) < IP < IPR(max) - 44.4 - mV/A VIOUT(Q) Bidirectional, IP = 0 A - 2.5 - V IP = IPR(max), TA = 25C to 150C -2 0.73 2 % IP = IPR(max), TA = -40C to 25C -6 1.4 6 % IP = IPR(max), TA = 25C to 150C -1.9 0.63 1.9 % ACCURACY PERFORMANCE Total Output Error [2] TOTAL OUTPUT ERROR ETOT COMPONENTS [3] Sensitivity Error Offset Voltage Error ESENS VOE ETOT = ESENS + 100 x VOE / (Sens x IP) IP = IPR(max), TA = -40C to 25C -5.5 1.4 5.5 % IP = 0 A, TA = 25C to 150C -10 6.9 10 mV IP = 0 A, TA = -40C to 25C -30 7.2 30 mV Typical values with are 3 sigma values. All devices stayed within limits during AEC-Q100 qualification. Percentage of IP, with IP = IPR(max). [3] A single device 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. [1] [2] ACS71240LLCBTR-050U5 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 5.0V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Optimized Sensing Range Sensitivity Zero-Current Output Voltage IPR Sens VIOUT(Q) 0 - 50 A IPR(min) < IP < IPR(max) - 80 - mV/A Unidirectional, IP = 0 A - 0.5 - V IP = IPR(max), TA = 25C to 150C -2 1.1 2 % IP = IPR(max), TA = -40C to 25C -6 3.75 6 % IP = IPR(max), TA = 25C to 150C -1.9 1.1 1.9 % IP = IPR(max), TA = -40C to 25C -5.5 3.8 5.5 % IP = 0 A, TA = 25C to 150C -10 4 10 mV IP = 0 A, TA = -40C to 25C -30 5.5 30 mV ACCURACY PERFORMANCE Total Output Error [2] ETOT TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 x VOE / (Sens x IP) Sensitivity Error Offset Voltage Error ESENS VOE Typical values with are 3 sigma values. All devices stayed within limits during AEC-Q100 qualification. Percentage of IP, with IP = IPR(max). [3] A single device 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. [1] [2] Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 12 ACS71240 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages FUNCTIONAL DESCRIPTION Power-On Reset Operation Power-On Power-On Reset (POR) refers to the voltage at which the device effectively turns on. In order to ensure accuracy of readings, the part remains off or "in POR" until the voltage reaches a point at which the device can be trusted. At this point the output leaves high Z and begins reporting the current. As VCC ramps up, the device output is high impedance (pink section) until VCC reaches POR. The descriptions in this section assume: TA = 25C, no output load (RL, CL), and no significant magnetic field is present. Refer to the scope plot in Figure 2 for the intended power on/off profile of the ACS71240. The device tested below contains a pull-down on VIOUT, forcing the output voltage to 0V during the high Z portion. Power-Off As VCC drops below POR the device output will enter a high impedance state. Figure 2: Power On/Off Profile of ACS71240 ICC = Green, VIOUT = Red, VCC = Yellow Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 13 ACS71240 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages DEFINITIONS OF ACCURACY CHARACTERISTICS Sensitivity (Sens). The change in sensor IC output in response to a 1A change through the primary conductor. The sensitivity is the product of the magnetic circuit sensitivity (G/A) (1G = 0.1mT) 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) -IP (A) Full Scale IP IPR(max) 0A Accuracy at 25C Only Decreasing VIOUT (V) Accuracy Across Temperature Figure 3: Output Voltage versus Sensed Current +ETOT Across Temperature 25C Only 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 3 and Figure 4. Figure 3 shows a distribution of output voltages versus IP at 25C and across temperature. Figure 4 shows the corresponding ETOT versus IP. +IP (A) VIOUT(Q) 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: ETOT (IP) = Accuracy at 25C Only Ideal VIOUT Accuracy Across Temperature Zero-Current Output Voltage (VIOUT(Q)). The output of the sensor when the primary current is zero. For unipolar devices this value will be 10% of operating voltage, 0.5V and 0.33V for 5V and 3.3V respectively. For bidirectional devices, the output will be 50% of the operating voltage, 2.5V and 1.65V for 5V and 3.3V devices respectively. Since the ACS71240 is a nonratiometric part, these values will be stable over VCC variations. Variation in VIOUT(Q) can be attributed to the resolution of the Allegro linear IC quiescent voltage trim and thermal drift. Offset Voltage (VOE). The deviation of the device output from its ideal quiescent value due to nonmagnetic causes. To convert this voltage to amperes, divide by the device sensitivity, Sens. Accuracy Across Temperature -IP +IP -ETOT Figure 4: Total Output Error versus Sensed Current 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 and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Power Supply Rejection Ratio (PSRR). The ratio of the change on VIOUT to a change in VCC in dB. PSRR = 20 log10 (| VCC VIOUT |) FAULT Error (EF). The difference between the current at which the FAULT pin trips (IFAULT), relative to the ideal fault current (IFAULT_ideal). This is equivalent to the difference between the ideal fault current and the actual fault current divided by the ideal current, and is defined as: EF = IFAULT - IFAULT _ ideal x 100 (%) IFAULT _ ideal Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 15 ACS71240 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages Fault Behavior The ACS71240 is available with both a latched and unlatched FAULT pin output. Unless otherwise stated, the default operation is unlatched. Contact Allegro for more details. tFAULT FAULT Unlatched Fault Behavior tFAULT IFAULT In the event that the FAULT pin is unlatched, the FAULT output will only assert while an overcurrent condition is present. When an overcurrent condition occurs, the FAULT pin will be pulled low within FAULT response time, tFAULT. When the overcurrent condition is removed, another tFAULT will delay the release of the line, after which the FAULT line will return to VCC with a time constant based on the pull-up resistor and line capacitance. IApplied Figure 5: Fault trip with response time Latched Fault Behavior In the event that the fault pin is latched, the FAULT output will assert when an overcurrent condition is present. The FAULT pin will remain latched even after the overcurrent condition has subsided. The FAULT pin will remain asserted until the device is power-cycled. FAULT tPW(MIN) Latched Fault Filtering To prevent nuisance tripping while in latched mode, the ACS71240 is available with a variety of minimum fault times, which are the minimum period a fault event must be present before the FAULT pin will latch. This minimum period, tPW(MIN), may be 0s, 0.5s, or 1s, and is available upon request. Contact Allegro for more details. In latched mode, there is an additional delay of 1 clock cycle (tCLK < 150ns) after the overcurrent event occurs. The fault behavior for latched and unlatched modes are shown in Figure 6 and Figure 7. < tCLK Unlatched time Figure 6: Fault event longer than tPW(MIN) FAULT < tCLK Latched tPW(MIN) Unlatched time Figure 7: Fault event shorter than tPW(MIN) Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 16 ACS71240 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages 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 reaches 10% of its full-scale value, and b) when it reaches 90% of its full-scale value. Propagation Delay (tpd). The time interval between a) when the sensed input current reaches 20% of its full-scale value, and b) when the sensor output reaches 20% of its full-scale value. (%) 90 Figure 8: Power-On Time (tPO) t Primary Current VIOUT Rise Time, tr 20 10 0 Propagation Delay, tpd t Figure 9: Rise Time (tr) and Propagation Delay (tpd) Response Time (tRESPONSE). The time interval between a) when the sensed input current reaches 90% of its final value, and b) when the sensor output reaches 90% of its full-scale value. (%) 90 Primary Current VIOUT Response Time, tRESPONSE 0 Figure 10: Response Time (tRESPONSE) Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com t 17 ACS71240 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages Common-Mode Field Rejection The ACS71240 features two Hall-effect sensors used differentially in order to eliminate stray field. The two sensors are placed on opposite sides of the current loop. This allows the common magnetic field to be determined and removed before the signal is sent to the end user. Despite this common field rejection, it is always best practice to reduce the amount of stray fields around the current sensor as much as possible. See the Allegro Applications note on reducing common mode field for more details. Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 18 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 PACKAGE OUTLINE DRAWINGS 3.00 0.05 0.85 0.075 REF 12 1 0.30 12 1.27 MIN 1 A 2 3.00 0.05 2.90 1.00 0.80 MIN Branded Face 9X 0.50 D SEATING PLANE 0.08 C 0.50 BSC C 0.70 2.05 REF 0.75 0.05 C +0.05 0.25 -0.07 F 1.36 1 1.79 0.400.10 B 0.20 2.70 PCB Layout Reference View 2 0.74 1 1.50 F E F F2 12 0.05 REF 1.31 F NNNN YYWW LLLL Standard Branding Reference View N = Device part number Y = Last two digits of year of manufacture W = Week of manufacture L = Lot number F1 2.20 For reference only, not for tooling use (reference JEDEC MO-220WEED except for fused current path and wettable flank) Dimensions in millimeters Exact case and lead configuration at supplier discretion within limits shown A Terminal #1 mark area B Fused sensed current path C Reference land pattern layout (reference IPC7351 QFN50P300X300X80-17W4M); All pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and PCB layout tolerances; when mounting on a multilayer PCB, thermal vias at the exposed thermal pad land can improve thermal dissipation (reference EIA/JEDEC Standard JESD51-5) D Coplanarity includes exposed current path and terminals E Branding scale and appearance at supplier discretion F Hall elements (F1 and F2); not to scale Figure 11: Package EXB, 12-Contact QFN with Fused Sensed Current Loop and Wettable Flank Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 19 Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 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 8 D D1 D2 0.25 0.17 D 3.90 0.10 D 5.60 6.00 0.20 A 1.52 1.04 REF 1 1.75 2 0.44 D 1.27 0.65 1 1.27 0.40 D 2.01 C 2 PCB Layout Reference View 0.25 BSC SEATING PLANE Branded Face C 8X 0.10 1.75 MAX C 0.51 0.31 GAUGE PLANE XXXXXXXX Lot Number SEATING PLANE 0.25 0.10 1.27 BSC 1 Standard Branding Reference View A Terminal #1 mark area B Branding scale and appearance at supplier discretion Line 1, 2: 8 characters Belly Brand: 5 characters 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. Line 1: Part Number Line 3: First 8 characters of Assembly Lot Number Belly Brand: Country of Origin Lot Number D Hall elements (D1 and D2); not to scale B Figure 12: Package LCB, 8-Pin SOIC 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 and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Revision History Number Date Description - March 7, 2019 Initial release 1 May 31, 2019 Updated TUV certificate mark 2 July 24, 2019 Added Hall elements to LC package drawing (page 20) 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 21