ACS71240KLCBTR-010B5-115

ACS71240 ALLEGRO | Alldatasheet

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Technical content

The Allegro™ ACS71240 current sensor IC is an economical and precise solution for AC or DC current sensing in industrial, automotive, commercial, and communications applications. 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 low- offset, 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. 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 flip- chip high-temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory. ACS71240-DS MCO-0000621

• 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 1.5 µs (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 mΩ (QFN-12) or 1.2 mΩ (SOIC-8) primary conductor resistance for low power loss and high inrush current withstand capability
• UL certified package (SOIC-8 only) for voltage isolation Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages Figure 1: Typical Application IP+ IP+ IP– IP– I P GND ACS71240 VCC VIOUT VCC CBYP 0.1 μF CLOAD RPU FAULT FEATURES AND BENEFITS DESCRIPTION PACKAGES : 12-contact QFN with wettable flank 3 mm × 3 mm × 0.75 mm (EXB package) ACS71240 March 7, 2019 8-pin SOIC with internally fused path (LCB package) CB Certificate Number: US-22334-A3-UL Type tested TÜV America Certificate Number: U8V 14 11 54214 032 CB 14 11 54214 031 SOIC-8 ONLY

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A. www.allegromicro.com SELECTION GUIDE Part Number Supply Voltage, VCC (V) Optimized Accuracy Range, IPR (A) Sensitivity (Typ) (mV/A) Fault Trip Level (A) Operating Ambient Temperature Range, TA (°C) Package Packing [1] ACS71240KEXBLT-010B3 3.3 ±10 132 ±10 –40 to 125 12-contact QFN with wettable flank (EXB) 1500 pieces per 7-inch reel 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 –40 to 150 8-pin SOIC with internally fused path (LCB) 3000 pieces per 13-inch reel ACS71240LLCBTR-030B3 3.3 ±30 44 ±30 ACS71240LLCBTR-045B5 5 ±45 44.4 ±45 ACS71240LLCBTR-050U5 5 50 80 50 [1] Contact Allegro for additional packing options. Naming Specification ACS71240KEXBTR - 010B3 Supply Operating Level, VCC 3 = 3.3 V 5 = 5.0 V Optimized Accuracy Range, IPR Packing Option Package Type EXB = QFN-12 Package with Wettable Flank LCB = SOIC-8 Package Operating Temperature Range, TA K = –40°C to 125°C (QFN-12 only) L = –40°C to 150°C (SOIC-8 only) Allegro Current Sensor 5-digit part number Current Polarity B = Bidirectional U = Unidirectional Custom Fault Level, I FAULT 115 = 115% IPR [blank] = 100% IPR - 115 LT = 1500 pieces per 7-inch reel (QFN-12 only) TR = 3000 pieces per 13-inch reel (SOIC-8 only)

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Units Supply Voltage 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 Reverse FAULT Voltage VFAULT(R) –0.5 V Operating Ambient Temperature Range TA Range K (QFN-12 package) –40 to 125 °C Range L (SOIC-8 package) –40 to 150 °C Junction Temperature TJ(MAX) 165 °C Storage Temperature Range Tstg –65 to 170 °C ISOLATION CHARACTERISTICS (for SOIC-8 package only) Characteristic Symbol Notes Value Units Dielectric Surge Strength Test Voltage VSURGE Tested ±5 pulses at 2/minute in compliance to IEC 61000-4-5 1.2 µs (rise) / 50 µs (width). 6000 V Dielectric Strength Test Voltage VISO Agency type-tested for 60 seconds per UL 60950-1 (edition 2); production-tested at VISO for 1 second, in accordance with UL 60950-1 (edition 2)

2400 VRMS

Working Voltage for Basic Isolation VWVBI Maximum approved working voltage for basic (single) isolation according to UL 60950-1 (edition 2)

420 VPK or VDC

297 VRMS

Clearance Dcl Minimum distance through air from IP leads to signal leads 4.2 mm Creepage Dcr Minimum distance along package body from IP leads to signal leads 4.2 mm ISOLATION CHARACTERISTICS (for QFN-12 package only) Characteristic Symbol Notes Value Units Working Voltage for Basic Isolation [1] VWVBI Voltage applied between pins 1-4 and 5-12 100 VPK or VDC [1] Based on characterization. No agency testing was conducted.

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Terminal List Table (QFN-12) Number Name Description 1, 2 IP+ Positive terminals for current being sensed; fused internally 3, 4 IP– Negative terminals for current being sensed; fused internally

5 GND Signal ground terminal

6 FAULT Overcurrent fault; active low

7, 8, 9, 10 NC No connection; connect to ground for optimal ESD performance

11 VIOUT Analog output signal

12 VCC Device power supply terminalPackage EX, 12-Pin QFN

PINOUT DIAGRAMS AND TERMINAL LIST TABLES VCC VIOUT GND FAULT NC NC NC NC IP+ IP+ IP– IP– Terminal List Table (SOIC-8) Number Name Description 1, 2 IP+ Positive terminals for current being sensed; fused internally 3, 4 IP– Negative terminals for current being sensed; fused internally

7 VIOUT Analog output signal

8 VCC Device power supply terminal

Package LC, 8-Pin SOIC Pinout Diagram IP+ IP+ IP– IP– VCC VIOUT FAULT GND

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Temperature Sensor VCC FAULT VIOUT GND EEPROM and Control Logic Master Current Supply Power On Reset Programming Control Offset Control Sensitivity Control Hall Current Drive IP+ IP+ IP– IP– Dynamic Offset Cancellation Fault Delay Logic To All Subcircuits Fault Comparator Functional Block Diagram

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit

ELECTRICAL CHARACTERISTICS

5 V variant 4.5 5.0 5.5 V 3.3 V variant 3.0 3.3 3.6 V 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 – – kΩ Primary Conductor Resistance RIP TA = 25°C QFN-12 package – 0.6 – mΩ SOIC-8 package – 1.2 – mΩ Primary Hall Coupling Factor G1 TA = 25°C QFN-12 package – 10 – G/A SOIC-8 package – 11 – G/A Secondary Hall Coupling Factor G2 TA = 25°C QFN-12 package – –2 – G/A SOIC-8 package – –2.8 – G/A Hall Plate Sensitivity Matching Sensmatch TA = 25°C – ±1 – % Common Mode Field Rejection CMFR Offset due to DC common field QFN-12 package – 1.2 – mA/G SOIC-8 package – 0.6 – mA/G Rise Time tr TA = 25°C, CL = 1 nF; input current step causing

1 V output swing – 3 4 [2] μs

TA = 25°C, CL = 1 nF; input current step causing 1 V output swing – 1.6 2.2 [2] μs Response Time tRESPONSE TA = 25°C, CL = 1 nF; input current step causing 1 V output swing – 4 4.9 [2] μs Bandwidth BW Small signal –3 dB; CL = 1 nF – 120 – kHz Noise Density IND VCC = 5.0 V, input referred, TA = 25°C, CL = 1 nF – 100 – µARMS/ √Hz VCC = 3.3 V, input referred, TA = 25°C, CL = 1 nF 150 µARMS/ √Hz Noise IN VCC = 5.0 V, input referred, TA = 25°C, CL = 1 nF – 52 – mARMS VCC = 3.3 V, input referred, TA = 25°C, CL = 1 nF – 78 – mARMS Nonlinearity ELIN Up to IP = 10 A QFN-12 package –1 – 1 % Through full range of IP SOIC-8 package –1 – 1 % Power Supply Rejection Ratio PSRR VCC = VCC ±10%, TA = 25°C, DC to 1 kHz – 40 – dB VCC = VCC ±10%, TA = 25°C, 1 kHz to 20 kHz – 30 – dB VCC = VCC ±10%, TA = 25°C, 20 kHz to 60 kHz – 20 – dB Output Saturation Voltage [3] VSAT_H RL = 10 kΩ VCC – 0.3 – – V VSAT_L RL = 10 kΩ – – 0.3 V Power-On Time tPO Output reaches 90% of steady-state level, TA = 25°C, IP = IPR(max) applied – 80 – μs Shorted Output-to-Ground Current ISC(GND) TA = 25°C – 30 – mA Shorted Output-to-VCC Current ISC(VCC) TA = 25°C – 1.8 – mA COMMON ELECTRICAL CHARACTERISTICS: Valid through the full range of TA and VCC, unless otherwise specified Continued on next page...

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit FAULT CHARACTERISTICS FAULT Operating Point IFAULT – ±1 × IPR [4] – A FAULT Current Hysteresis IF(HYS) Percent of IPR(MAX) 3 5 – % FAULT Output Pullup Resistor RPU 10 – 500 kΩ FAULT Output Voltage VOL RPU = 10 kΩ, during fault condition – – 0.3 V FAULT Response Time tFAULT Time from |IP| rising above |IFAULT| until VFAULT < VOL(MAX). 100 pF from FAULT to GND. Input current step 20% above IFAULT with rise time ≤ 1 µs. – 1.5 2.5 [5] µs FAULT Error EF IFAULT, TA = 25°C –10 ±3.5 10 % TA = –40°C or TA(MAX) –10 ±5 10 % [1] Typical values with ± are 3 sigma values. [2] Guaranteed by design. Limit calculated using 6 sigma. Not tested in production. [3] The sensor IC will continue to respond to current beyond the range of IP until the high or low saturation voltage; however, the nonlinearity in this region will be worse than through the rest of the measurement range. [4] Unless otherwise specified, contact Allegro for alternative fault levels. Available from ±0.5 to 2 × IPR. [5] Not tested in production. COMMON ELECTRICAL CHARACTERISTICS (continued): Valid through the full range of TA and VCC, unless otherwise specified

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ACS71240KEXBLT-010B3 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Optimized Sensing Range IPR –10 – 10 A Sensitivity Sens IPR(min) < IP < IPR(max) – 132 – mV/A Zero-Current Output Voltage VIOUT(Q) Bidirectional, IP = 0 A – 1.65 – V ACCURACY PERFORMANCE Total Output Error [2] ETOT IP = 10 A, TA = 25°C to 125°C –2.5 ±1.4 2.5 % IP = 10 A, TA = –40°C to 25°C –6 ±1.8 6 % TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 × VOE / (Sens × IP) Sensitivity Error ESENS IP = 10 A, TA = 25°C to 125°C –2 ±1.1 2 % Offset Voltage Error VOE IP = 0 A, TA = 25°C to 125°C –15 ±9.7 15 mV IP = 0 A, TA = –40°C to 25°C –30 ±8.5 30 mV ACCURACY PERFORMANCE INCLUDING LIFETIME DRIFT [4] Total Output Error Including Lifetime Drift [5] ETOT_drift IP = 10 A, TA = 25°C to 125°C –5.7 ±1.8 5.7 % IP = 10 A, TA = –40°C to 25°C –6 ±1.5 6 % Sensitivity Error Including Lifetime Drift [6] ESENS_drift IP = 10 A, TA = 25°C to 125°C –5.1 ±1.2 5.1 % Offset Voltage Error Including Lifetime Drift [7] VOE_drift IP = 0 A, TA = 25°C to 125°C –28 ±4.5 28 mV IP = 0 A, TA = –40°C to 25°C –30 ±4.3 30 mV [1] 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. [2] 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 22 mV. ACS71240KEXBLT-010B3-115 Variant Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NON-STANDARD FAULT CHARACTERISTICS FAULT Operating Point IFAULT – ±1.15 × IPR – A [1] Typical values with ± are 3 sigma values

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ACS71240KEXBLT-030B3 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Optimized Sensing Range IPR –30 – 30 A Sensitivity Sens IPR(min) < IP < IPR(max) – 44 – mV/A Zero-Current Output Voltage VIOUT(Q) Bidirectional, IP = 0 A – 1.65 – V ACCURACY PERFORMANCE Total Output Error [2] ETOT IP = 10 A, TA = 25°C to 125°C –2.5 ±0.8 2.5 % IP = 10 A, TA = –40°C to 25°C –6 ±1.9 6 % TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 × VOE / (Sens × IP) Sensitivity Error ESENS IP = 10 A, TA = 25°C to 125°C –2 ±0.9 2 % Offset Voltage Error VOE IP = 0 A, TA = 25°C to 125°C –15 ±3.71 15 mV IP = 0 A, TA = –40°C to 25°C –30 ±7.1 30 mV ACCURACY PERFORMANCE INCLUDING LIFETIME DRIFT [4] Total Output Error Including Lifetime Drift [5] ETOT_drift IP = 10 A, TA = 25°C to 125°C –5.7 ±1.8 5.7 % IP = 10 A, TA = –40°C to 25°C –6 ±1.5 6 % Sensitivity Error Including Lifetime Drift [6] ESENS_drift IP = 10 A, TA = 25°C to 125°C –5.1 ±1.2 5.1 % Offset Voltage Error Including Lifetime Drift [7] VOE_drift IP = 0 A, TA = 25°C to 125°C –28 ±4.5 28 mV IP = 0 A, TA = –40°C to 25°C –30 ±4.3 30 mV [1] 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. [2] 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 22 mV.

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ACS71240KEXBLT-050U5 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 5.0 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Optimized Sensing Range IPR 0 – 50 A Sensitivity Sens IPR(min) < IP < IPR(max) – 80 – mV/A Zero-Current Output Voltage VIOUT(Q) Unidirectional, IP = 0 A – 0.5 – V ACCURACY PERFORMANCE Total Output Error [2] ETOT IP = 10 A, TA = 25°C to 125°C –2.5 ±1.2 2.5 % IP = 10 A, TA = –40°C to 25°C –6 ±3.6 6 % TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 × VOE / (Sens × IP) Sensitivity Error ESENS IP = 10 A, TA = 25°C to 125°C –2 ±0.9 2 % Offset Voltage Error VOE IP = 0 A, TA = 25°C to 125°C –10 ±4.6 10 mV IP = 0 A, TA = –40°C to 25°C –30 ±6.3 30 mV ACCURACY PERFORMANCE INCLUDING LIFETIME DRIFT [4] Total Output Error Including Lifetime Drift [5] ETOT_drift IP = 10 A, TA = 25°C to 125°C –5.7 ±1.8 5.7 % IP = 10 A, TA = –40°C to 25°C –6 ±1.5 6 % Sensitivity Error Including Lifetime Drift [6] ESENS_drift IP = 10 A, TA = 25°C to 125°C –5.1 ±1.2 5.1 % Offset Voltage Error Including Lifetime Drift [7] VOE_drift IP = 0 A, TA = 25°C to 125°C –28 ±4.5 28 mV IP = 0 A, TA = –40°C to 25°C –30 ±4.3 30 mV [1] 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. [2] 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 22 mV.

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ACS71240LLCBTR-010B3 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Optimized Sensing Range IPR –10 – 10 A Sensitivity Sens IPR(min) < IP < IPR(max) – 132 – mV/A Zero-Current Output Voltage VIOUT(Q) Bidirectional, IP = 0 A – 1.65 – V ACCURACY PERFORMANCE Total Output Error [2] ETOT IP = IPR(max), TA = 25°C to 150°C –2 ±1 2 % IP = IPR(max), TA = –40°C to 25°C –6 ±2.4 6 % TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 × VOE / (Sens × IP) Sensitivity Error ESENS IP = IPR(max), TA = 25°C to 150°C –1.5 ±0.84 1.5 % IP = IPR(max), TA = –40°C to 25°C –5.5 ±2.3 5.5 % Offset Voltage Error VOE IP = 0 A, TA = 25°C to 150°C –10 ±6.7 10 mV IP = 0 A, TA = –40°C to 25°C –30 ±10 30 mV [1] Typical values with ± are 3 sigma values. All devices stayed within limits during AEC-Q100 qualification. [2] 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. ACS71240LLCBTR-030B3 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 3.3 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Optimized Sensing Range IPR –30 – 30 A Sensitivity Sens IPR(min) < IP < IPR(max) – 44 – mV/A Zero-Current Output Voltage VIOUT(Q) Bidirectional, IP = 0 A – 1.65 – V ACCURACY PERFORMANCE Total Output Error [2] ETOT IP = IPR(max), TA = 25°C to 150°C –2 ±0.6 2 % IP = IPR(max), TA = –40°C to 25°C –6 ±1.4 6 % TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 × VOE / (Sens × IP) Sensitivity Error ESENS IP = IPR(max), TA = 25°C to 150°C –1.9 ±0.53 1.9 % IP = IPR(max), TA = –40°C to 25°C –5.5 ±1.1 5.5 % Offset Voltage Error VOE IP = 0 A, TA = 25°C to 150°C –10 ±7.2 10 mV IP = 0 A, TA = –40°C to 25°C –30 ±9.5 30 mV [1] Typical values with ± are 3 sigma values. All devices stayed within limits during AEC-Q100 qualification. [2] 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.

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ACS71240LLCBTR-045B5 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 5 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Optimized Sensing Range IPR –45 – 45 A Sensitivity Sens IPR(min) < IP < IPR(max) – 44.4 – mV/A Zero-Current Output Voltage VIOUT(Q) Bidirectional, IP = 0 A – 2.5 – V ACCURACY PERFORMANCE Total Output Error [2] ETOT IP = IPR(max), TA = 25°C to 150°C –2 ±0.73 2 % IP = IPR(max), TA = –40°C to 25°C –6 ±1.4 6 % TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 × VOE / (Sens × IP) Sensitivity Error ESENS IP = IPR(max), TA = 25°C to 150°C –1.9 ±0.63 1.9 % IP = IPR(max), TA = –40°C to 25°C –5.5 ±1.4 5.5 % Offset Voltage Error VOE IP = 0 A, TA = 25°C to 150°C –10 ±6.9 10 mV IP = 0 A, TA = –40°C to 25°C –30 ±7.2 30 mV [1] Typical values with ± are 3 sigma values. All devices stayed within limits during AEC-Q100 qualification. [2] 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. ACS71240LLCBTR-050U5 PERFORMANCE CHARACTERISTICS: Over full range of TA, VCC = 5.0 V, unless otherwise specified Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit NOMINAL PERFORMANCE Optimized Sensing Range IPR 0 – 50 A Sensitivity Sens IPR(min) < IP < IPR(max) – 80 – mV/A Zero-Current Output Voltage VIOUT(Q) Unidirectional, IP = 0 A – 0.5 – V ACCURACY PERFORMANCE Total Output Error [2] ETOT IP = IPR(max), TA = 25°C to 150°C –2 ±1.1 2 % IP = IPR(max), TA = –40°C to 25°C –6 ±3.75 6 % TOTAL OUTPUT ERROR COMPONENTS [3] ETOT = ESENS + 100 × VOE / (Sens × IP) Sensitivity Error ESENS IP = IPR(max), TA = 25°C to 150°C –1.9 ±1.1 1.9 % IP = IPR(max), TA = –40°C to 25°C –5.5 ±3.8 5.5 % Offset Voltage Error VOE IP = 0 A, TA = 25°C to 150°C –10 ±4 10 mV IP = 0 A, TA = –40°C to 25°C –30 ±5.5 30 mV [1] Typical values with ± are 3 sigma values. All devices stayed within limits during AEC-Q100 qualification. [2] 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.

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com FUNCTIONAL DESCRIPTION Power-On Reset Operation 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. The descriptions in this section assume: T A = 25°C, 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 0 V during the high Z portion. Figure 2: Power On/Off Profile of ACS71240 ICC = Green, VIOUT = Red, VCC = Yellow Power-On As VCC ramps up, the device output is high impedance (pink sec- tion) until VCC reaches POR. Power-Off As VCC drops below POR the device output will enter a high impedance state.

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 3: Output Voltage versus Sensed Current Figure 4: Total Output Error versus Sensed Current 0 A Decreasing VIOUT (V) Accuracy Across Temperature Accuracy Across Temperature Accuracy Across Temperature Accuracy at 25°C Only Accuracy at 25°C Only Accuracy at 25°C Only Increasing V IOUT (V) Ideal VIOUT IPR(min) IPR(max) +IP (A) –IP (A) VIOUT(Q) Full Scale IP +IP–IP +ETOT –ETOT Across Temperature 25°C Only 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 ampli- fier 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: E=LIN 1– V( I )–VIOUT PR(max) IOUT(Q) 2•V( I /2) –VIOUT PR(max) IOUT(Q)

• 100(%) 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, 0.5 V and 0.33 V for 5 V and 3.3 V respectively. For bidirectional devices, the output will be 50% of the operating voltage, 2.5 V and 1.65 V for 5 V and 3.3 V devices respectively. Since the ACS71240 is a non- ratiometric 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. Total Output Error (ETOT). The difference between the cur- rent 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: E( I)TOTP V( I )–V (I )IOUT_ideal PI OUT P Sens (I )•Iideal PP
• 100 (%)= The Total Output Error incorporates all sources of error and is a function of I P. At relatively high currents, ETOT will be mostly due to sensitivity error, and at relatively low currents, ETOT will be mostly due to Offset V oltage (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 I P at 25°C and across temperature. Figure 4 shows the cor- responding ETOT versus IP .

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Power Supply Rejection Ratio (PSRR). The ratio of the change on VIOUT to a change in VCC in dB. PSRR = 20 log10 ΔV CC ΔV IOUT (| |) 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: (%)– ×E I II 100 F FAUL Ti deal FAUL TF AULT idea l

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 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. Unlatched Fault Behavior 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, t FAULT. 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. 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 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, t PW(MIN), may be 0 µs, 0.5 µs, or 1 µs, and is available upon request. Con- tact Allegro for more details. In latched mode, there is an additional delay of 1 clock cycle (tCLK < 150 ns) after the overcurrent event occurs. The fault behavior for latched and unlatched modes are shown in Figure 6 and Figure 7. FAULT IFAULT IApplied tFAULT tFAULT Figure 5: Fault trip with response time Latched Unlatched time FAULT < tCLK tPW(MIN) Figure 6: Fault event longer than tPW(MIN) Latched Unlatched time FAULT < tCLK tPW(MIN) Figure 7: Fault event shorter than tPW(MIN)

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com DEFINITIONS OF DYNAMIC RESPONSE CHARACTERISTICS Power-On Time (tPO). When the supply is ramped to its operat- ing 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, V CC(min), as shown in the chart at right. 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. Response Time (t RESPONSE). 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. Propagation Delay (t pd ). 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. VIOUT V t VCC VCC(min.) 90% VIOUT 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 t1 t2 tPO VCC(typ.) Primary Current VIOUT (%) Response Time, tRESPONSE t Primary Current VIOUT (%) Propagation Delay, tpd Rise Time, tr t Figure 8: Power-On Time (tPO) Figure 9: Rise Time (tr) and Propagation Delay (tpd) Figure 10: Response Time (tRESPONSE)

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Common-Mode Field Rejection The ACS71240 features two Hall-effect sensors used differen- tially 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 Applica- tions note on reducing common mode field for more details.

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 11: Package EXB, 12-Contact QFN with Fused Sensed Current Loop and Wettable Flank PACKAGE OUTLINE DRAWINGS 0.30 Branded Face 1.00 0.50 0.70 0.85 1.27 MIN 0.80 MIN 2.90

2.05 REF

2.70 C CSEATING PLANE0.25 +0.05 –0.07 0.40±0.10 0.50 BSC 0.75 ±0.05 3.00 ±0.05 3.00 ±0.05 D D Coplanarity includes exposed current path and terminals B A Terminal #1 mark area B Fused sensed current path 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 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) A PCB Layout Reference View C0.08 Branding scale and appearance at supplier discretionE E Standard Branding Reference View N = Device part number Y = Last two digits of year of manufacture W = Week of manufacture L = Lot number NNNN YYWW LLLL

0.05 REF

0.075 REF

0.74 1.50 1.36 F F F F F2 Hall elements (F1 and F2); not to scaleF 1.31 2.20 0.20 1.79

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 12: Package LCB, 8-Pin SOIC For Reference Only – Not for Tooling Use (Reference MS-012AA) Dimensions in millimeters –N OT TO SCALE Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact case and lead configuration at supplier discretion within limits shown C SEATING PLANE

1.27 BSC

A B B C 2 1 Branding scale and appearance at supplier discretion C C0.10

0.25 BSC

1.04 REF

1.75 MAX

4.90 ±0.10 0.51 0.31 0.25 0.10 0.25 0.17 1.27 0.40 A Standard Branding Reference View 2 1 C 0.65 1.27 5.60 1.75 Branded Face SEATING PLANE GAUGE PLANE Terminal #1 mark area 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. PCB Layout Reference View Line 1, 2: 8 characters Belly Brand: 5 characters Line 1: Part Number Line 3: First 8 characters of Assembly Lot Number Belly Brand: Country of Origin Lot Number XXXXXXXX Lot Number

Automotive-Grade, Galvanically Isolated Current Sensor IC with Common-Mode Field Rejection and Overcurrent Detection in Small Footprint Low-Profile Packages ACS71240 Allegro MicroSystems, LLC Manchester, NH 03103-3353 U.S.A. www.allegromicro.com For the latest version of this document, visit our website: www.allegromicro.com

Revision History

– March 7, 2019 Initial release Copyright 2019, Allegro MicroSystems, LLC Allegro MicroSystems, LLC 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, LLC 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.