ACS722

ACS722_V01 ALLEGRO | Alldatasheet

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The Allegro™ ACS722 current sensor IC is an economical and precise solution for AC or DC current sensing in industrial, 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. 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 includes Allegro’s patented digital temperature compensation, resulting in extremely accurate performance over temperature. 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 0.65 mΩ typical, providing low power loss. The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS722 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. The ACS722 is provided in a small, low profile surface mount SOIC8 package. The leadframe is plated with 100% matte tin, ACS722-DS, Rev. 5 MCO-0000537

Patented integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open loop sensor
UL60950-1 (ed. 2) certified □ Dielectric Strength V oltage = 2.4 kVrms □ Basic Isolation Working V oltage = 420 Vpk/297 Vrms
Industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design techniques
Pin-selectable band width: 80 kHz for high bandwidth applications or 20 kHz for low noise performance
0.65 mΩ primary conductor resistance for low power loss and high inrush current withstand capability
Small footprint, low-profile SOIC8 package suitable for space-constrained applications
Integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to high dv/dt transients
3 to 3.6 V , single supply operation High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package Continued on the next page… Package: 8-pin SOIC (suff ix LC) Typical Application P P P L CBYPASS 0.1 µF ACS722 C IP+ VCC IP+ VIOUT IP– IP– BW_SEL GND I The ACS722 outputs an analog signal, VIOUT , that changes, proportionally, with the bidirectional AC or DC primary sensed current, I P , within the specified measurement range. The BW_SEL pin can be used to select one of the two bandwidths to optimize the noise performance. Grounding the BW_SEL pin puts the part in the high bandwidth (80 kHz) mode. Continued on the next page… FEATURES AND BENEFITS DESCRIPTION ACS722 September 3, 2019 TÜV America Certificate Number: U8V 18 02 54214 041 CB 14 11 54214 031 UL Certified File No.: US-32848-UL

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A. www.allegromicro.com SELECTION GUIDE Part Number IPR (A) Sens(Typ) at VCC = 3.3 V (mV/A) TA (°C) Packing [1] ACS722LLCTR-05AB-T [2] ±5 264 -40 to 150 Tape and Reel, 3000 pieces per reel ACS722LLCTR-10AU-T [2] 10 ACS722LLCTR-10AB-T [2] ±10 132 ACS722LLCTR-20AU-T [2] 20 ACS722LLCTR-20AB-T [2] ±20 ACS722LLCTR-40AU-T [2] 40 ACS722LLCTR-40AB-T [2] ±40 33 [1] Contact Allegro for additional packing options. [2] Variant not intended for automotive applications. 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. DESCRIPTION (continued)

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 FEATURES AND BENEFITS (continued)

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com THERMAL CHARACTERISTICS Characteristic Symbol Test Conditions* Value Units Package Thermal Resistance (Junction to Ambient) RθJA Mounted on the Allegro 85-0593 evaluation board with 400 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. 23 ºC/W Package Thermal Resistance (Junction to Lead) RθJL Mounted on the Allegro ASEK 722 evaluation board. 5 ºC/W *Additional thermal information available on the Allegro website. ISOLATION CHARACTERISTICS Characteristic Symbol Notes Rating Unit 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 UL 60950-1 (edition 2). 420 V PK or VDC

297 VRMS

Clearance Dcl Minimum distance through air from IP leads to signal leads. 3.9 mm Creepage Dcr Minimum distance along package body from IP leads to signal leads. 3.9 mm ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Notes Rating Units Supply Voltage VCC 6 V Reverse Supply Voltage VRCC –0.1 V Output Voltage VIOUT 25 V Reverse Output Voltage VRIOUT –0.1 V Maximum Continuous Current ICMAX TA = 25°C 65 A Operating Ambient Temperature TA Range L –40 to 150 °C Junction Temperature TJ(max) 165 °C Storage Temperature Tstg –65 to 165 °C SPECIFICATIONS

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Dynamic OffsetCancellation Master Current Supply Programming Control EEPROM and Control Logic Offset Control Sensitivity Control Tuned Filter Temperature Sensor Hall Current Drive POR ToAll Subcircuits IP+ IP+ IP– IP– VCC VIOUT GNDBW_SEL Functional Block Diagram

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com TERMINAL LIST TABLE Number Name Description 1, 2 IP+ Terminals for current being sensed; fused internally 3, 4 IP– Terminals for current being sensed; fused internally

5 GND Signal ground terminal

6 BW_SEL Terminal for selecting 20 kHz or 80 kHz bandwidth

7 VIOUT Analog output signal

8 VCC Device power supply terminal

IP– IP– VCC VIOUT BW_SEL GND Pinout Diagram PINOUT DIAGRAM AND TERMINAL LIST

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com COMMON ELECTRICAL CHARACTERISTICS [1]: Valid through the full range of TA = –40°C to 150°C , and at VCC = 3.3 V, unless otherwise specif ied Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage VCC 3 3.3 3.6 V Supply Current ICC VCC within VCC(min) and VCC(max) – 9 12 mA Output Capacitance Load CL VIOUT to GND – – 10 nF Output Resistive Load RL VIOUT to GND 4.7 – – kΩ Primary Conductor Resistance RIP TA = 25°C – 0.65 – mΩ Magnetic Coupling Factor CF – 10 – G/A Rise Time tr IP = IP(max), TA = 25°C, CL = 1 nF, BW_SEL tied to GND – 4 – μs IP = IP(max), TA = 25°C, CL = 1 nF, BW_SEL tied to VCC – 17.5 – μs Propagation Delay tpd IP = IP(max), TA = 25°C, CL = 1 nF, BW_SEL tied to GND – 1 – μs IP = IP(max), TA = 25°C, CL = 1 nF, BW_SEL tied to VCC – 5 – μs Response Time tRESPONSE IP = IP(max), TA = 25°C, CL = 1 nF, BW_SEL tied to GND – 5 – μs IP = IP(max), TA = 25°C, CL = 1 nF, BW_SEL tied to VCC – 22.5 – μs Internal Bandwidth BWi Small signal –3 dB; CL = 1 nF, BW_SEL tied to GND – 80 – kHz Small signal –3 dB; CL = 1nF, BW_SEL tied to VCC – 20 – kHz Noise Density IND Input referenced noise density; TA = 25°C, CL = 1 nF – 150 – µA(rms)/ √Hz Noise IN Input referenced noise; BWi = 80 kHz, TA = 25°C, CL = 1 nF – 42 – mA(rms) Input referenced noise; BWi = 20 kHz, T A = 25°C, CL = 1 nF – 21 – mA(rms) Nonlinearity ELIN Through full range of IP – ±1 % Saturation Voltage [2] VOH RL = 4.7 kΩ, TA = 25°C VCC – 0.33 – – V VOL RL = 4.7 kΩ, TA = 25°C – – 0.33 V Power-On Time tPO Output reaches 90% of steady-state level, T A = 25°C, IP = IPR(max) applied – 64 – μs [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] 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.

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com xLLCTR-5AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = – 40°C to 150°C, VCC = 3.3 V, unless otherwise specif ied Characteristic Symbol Test Conditions Min. Typ. Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR –5 – 5 A Sensitivity Sens IPR(min) < IP < IPR(max) – 264 – mV/A Zero Current Output Voltage VIOUT(Q) Bidirectional; IP = 0 A – VCC × 0.5 – V ACCURACY PERFORMANCE Sensitivity Error Esens TA = 25°C to 150°C; measured at IP = IPR(max) –2 – 2 % TA = –40°C to 25°C; ; measured at IP = IPR(max) – ±2.5 – % Offset Voltage [1] VOE IP = 0 A; TA = 25°C to 150°C –15 – 15 mV IP = 0 A; TA = -40°C to 25°C – ±20 – mV Total Output Error [2] ETOT IP = IPR(max), TA = 25°C to 150°C –2.5 – 2.5 % IP = IPR(max), TA = –40°C to 25°C – ±3 – % LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift – ±2 – % Total Output Error Lifetime Drift Etot_drift – ±2 – % [1] Offset V oltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. [2] Percentage of IP , with IP = IPR(max).

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com xLLCTR-10AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = – 40°C to 150°C, VCC = 3.3 V, unless otherwise specif ied Characteristic Symbol Test Conditions Min. Typ. Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR 0 – 10 A Sensitivity Sens IPR(min) < IP < IPR(max) – 264 – mV/A Zero Current Output Voltage VIOUT(Q) Unidirectional; IP = 0 A – VCC × 0.1 – V ACCURACY PERFORMANCE Sensitivity Error Esens TA = 25°C to 150°C; measured at IP = IPR(max) –2 – 2 % TA = –40°C to 25°C; ; measured at IP = IPR(max) – ±2.5 – % Offset Voltage [1] VOE IP = 0 A; TA = 25°C to 150°C –15 – 15 mV IP = 0 A; TA = -40°C to 25°C – ±20 – mV Total Output Error [2] ETOT IP = IPR(max), TA = 25°C to 150°C –2.5 – 2.5 % IP = IPR(max), TA = –40°C to 25°C – ±3 – % LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift – ±2 – % Total Output Error Lifetime Drift Etot_drift – ±2 – % [1] Offset V oltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. [2] Percentage of IP , with IP = IPR(max). xLLCTR-10AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = – 40°C to 150°C, VCC = 3.3 V, unless otherwise specif ied Characteristic Symbol Test Conditions Min. Typ. Max. Units NOMINAL PERFORMANCE Current 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 – VCC × 0.5 – V ACCURACY PERFORMANCE Sensitivity Error Esens TA = 25°C to 150°C; measured at IP = IPR(max) –1.5 – 1.5 % TA = –40°C to 25°C; ; measured at IP = IPR(max) – ±2 – % Offset Voltage [1] VOE IP = 0 A; TA = 25°C to 150°C –10 – 10 mV IP = 0 A; TA = -40°C to 25°C – ±15 – mV Total Output Error [2] ETOT IP = IPR(max), TA = 25°C to 150°C –2 – 2 % IP = IPR(max), TA = –40°C to 25°C – ±3 – % LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift – ±2 – % Total Output Error Lifetime Drift Etot_drift – ±2 – % [1] Offset V oltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. [2] Percentage of IP , with IP = IPR(max).

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com xLLCTR-20AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = – 40°C to 150°C, VCC = 3.3 V, unless otherwise specif ied Characteristic Symbol Test Conditions Min. Typ. Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR 0 – 20 A Sensitivity Sens IPR(min) < IP < IPR(max) – 132 – mV/A Zero Current Output Voltage VIOUT(Q) Unidirectional; IP = 0 A – VCC × 0.1 – V ACCURACY PERFORMANCE Sensitivity Error Esens TA = 25°C to 150°C; measured at IP = IPR(max) –1.5 – 1.5 % TA = –40°C to 25°C; ; measured at IP = IPR(max) – ±2 – % Offset Voltage [1] VOE IP = 0 A; TA = 25°C to 150°C –10 – 10 mV IP = 0 A; TA = -40°C to 25°C – ±15 – mV Total Output Error [2] ETOT IP = IPR(max), TA = 25°C to 150°C –2 – 2 % IP = IPR(max), TA = –40°C to 25°C – ±3 – % LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift – ±2 – % Total Output Error Lifetime Drift Etot_drift – ±2 – % [1] Offset V oltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. [2] Percentage of IP , with IP = IPR(max). xLLCTR-20AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = – 40°C to 150°C, VCC = 3.3 V, unless otherwise specif ied Characteristic Symbol Test Conditions Min. Typ. Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR –20 – 20 A Sensitivity Sens IPR(min) < IP < IPR(max) – 66 – mV/A Zero Current Output Voltage VIOUT(Q) Bidirectional; IP = 0 A – VCC × 0.5 – V ACCURACY PERFORMANCE Sensitivity Error Esens TA = 25°C to 150°C; measured at IP = IPR(max) –1.5 – 1.5 % TA = –40°C to 25°C; ; measured at IP = IPR(max) – ±2 – % Offset Voltage [1] VOE IP = 0 A; TA = 25°C to 150°C –10 – 10 mV IP = 0 A; TA = -40°C to 25°C – ±15 – mV Total Output Error [2] ETOT IP = IPR(max), TA = 25°C to 150°C –2 – 2 % IP = IPR(max), TA = –40°C to 25°C – ±3 – % LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift – ±2 – % Total Output Error Lifetime Drift Etot_drift – ±2 – % [1] Offset V oltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. [2] Percentage of IP , with IP = IPR(max).

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com xLLCTR-40AU PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = – 40°C to 150°C, VCC = 3.3 V, unless otherwise specif ied Characteristic Symbol Test Conditions Min. Typ. Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR 0 – 40 A Sensitivity Sens IPR(min) < IP < IPR(max) – 66 – mV/A Zero Current Output Voltage VIOUT(Q) Unidirectional; IP = 0 A – VCC × 0.1 – V ACCURACY PERFORMANCE Sensitivity Error Esens TA = 25°C to 150°C; measured at IP = IPR(max) –1.5 – 1.5 % TA = –40°C to 25°C; ; measured at IP = IPR(max) – ±2 – % Offset Voltage [1] VOE IP = 0 A; TA = 25°C to 150°C –10 – 10 mV IP = 0 A; TA = -40°C to 25°C – ±15 – mV Total Output Error [2] ETOT IP = IPR(max), TA = 25°C to 150°C –2 – 2 % IP = IPR(max), TA = –40°C to 25°C – ±3 – % LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift – ±2 – % Total Output Error Lifetime Drift Etot_drift – ±2 – % [1] Offset V oltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. [2] Percentage of IP , with IP = IPR(max). xLLCTR-40AB PERFORMANCE CHARACTERISTICS: TA Range L, valid at TA = – 40°C to 150°C, VCC = 3.3 V, unless otherwise specif ied Characteristic Symbol Test Conditions Min. Typ. Max. Units NOMINAL PERFORMANCE Current Sensing Range IPR –40 – 40 A Sensitivity Sens IPR(min) < IP < IPR(max) – 33 – mV/A Zero Current Output Voltage VIOUT(Q) Bidirectional; IP = 0 A – VCC × 0.5 – V ACCURACY PERFORMANCE Sensitivity Error Esens TA = 25°C to 150°C; measured at IP = IPR(max) –1.5 – 1.5 % TA = –40°C to 25°C; ; measured at IP = IPR(max) – ±2 – % Offset Voltage [1] VOE IP = 0 A; TA = 25°C to 150°C –10 – 10 mV IP = 0 A; TA = -40°C to 25°C – ±15 – mV Total Output Error [2] ETOT IP = IPR(max), TA = 25°C to 150°C –2 – 2 % IP = IPR(max), TA = –40°C to 25°C – ±3 – % LIFETIME DRIFT CHARACTERISTICS Sensitivity Error Lifetime Drift Esens_drift – ±2 – % Total Output Error Lifetime Drift Etot_drift – ±2 – % [1] Offset V oltage does not incorporate any error due to external magnetic fields. See section: Impact of External Magnetic Fields. [2] Percentage of IP , with IP = IPR(max).

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com CHARACTERISTIC PERFORMANCE Zero Current Output Voltage vs. Temperature Offset Voltage vs. Temperature Sensitivity vs. Temperature Nonlinearity vs. Temperature Total Error at I vs. TemperaturePR(max) Sensitivity Error vs. Temperature Temperature (ºC) Offset Voltage (mV) -50 -50 -50 -50 -50 -50 0 0 50 50 100 100 100 100 100 100 150 150 150 150 150 150 Temperature (ºC) 1600 258 -4 1610 260 -3 1620 262 -2 1630 264 -1 1660 270 2 1640 266 0 1670 272 3 1650 268 1 1680 274 4 V (mV) IOUT(Q) Temperature (ºC) Sensitivity (mV/A) Temperature (ºC) Sensitivity Error (%) Temperature (ºC) Total Error (%) Temperature (ºC) Nonlinearity (%) -1.00 -5 -0.80 -4 -0.40 -2 -0.20 -1 0.00 0 0.20 1 0.80 4 0.60 3 1.00 5 +3 Sigma Average -3 Sigma -50 -40 -30 -20 -10 0.40 2 -0.60 -3 xLLCTR-5AB Key Parameters

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Zero Current Output Voltage vs. Temperature Offset Voltage vs. Temperature Sensitivity vs. Temperature Nonlinearity vs. Temperature Total Error at I vs. TemperaturePR(max) Sensitivity Error vs. Temperature Temperature (ºC) Offset Voltage (mV) -50 -50 -50 -50 -50 -50 0 0 50 50 100 100 100 100 100 100 150 150 150 150 150 150 Temperature (ºC) 1635 -15 129 -4 130 -3 1640 -10 131 -2 1645 -5 132 -1 1655 5 135 2 133 0 136 3 1650 0 134 1 1660 10 137 4 V (mV) IOUT(Q) Temperature (ºC) Sensitivity (mV/A) Temperature (ºC) Sensitivity Error (%) Temperature (ºC) Total Error (%) Temperature (ºC) Nonlinearity (%) -1.00 -5 -0.80 -4 -0.40 -2 -0.20 -1 0.00 0 0.20 1 0.80 4 0.60 3 1.00 5 +3 Sigma Average -3 Sigma 0.40 2 -0.60 -3 xLLCTR-10AB Key Parameters

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Zero Current Output Voltage vs. Temperature Offset Voltage vs. Temperature Sensitivity vs. Temperature Nonlinearity vs. Temperature Total Error at I vs. TemperaturePR(max) Sensitivity Error vs. Temperature Temperature (ºC) Offset Voltage (mV) -50 -50 -50 -50 -50 -50 0 0 50 50 100 100 100 100 100 100 150 150 150 150 150 150 Temperature (ºC) 256 300 -30 258 305 -25 262 310 -20 264 315 -15 272 330 0 266 320 -10 274 335 5 268 325 -5 276 340 10 V (mV) IOUT(Q) Temperature (ºC) Sensitivity (mV/A) Temperature (ºC) Sensitivity Error (%) Temperature (ºC) Total Error (%) Temperature (ºC) Nonlinearity (%) -1.00 -5 -0.80 -4 -0.40 -2 -0.20 -1 0.00 0 0.20 1 0.80 4 0.60 3 1.00 5 +3 Sigma Average -3 Sigma 0.40 2 -0.60 -3 270 260 xLLCTR-10AU Key Parameters

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Zero Current Output Voltage vs. Temperature Offset Voltage vs. Temperature Sensitivity vs. Temperature Nonlinearity vs. Temperature Total Error at I vs. TemperaturePR(max) Sensitivity Error vs. Temperature Temperature (ºC) Offset Voltage (mV) -50 -50 -50 -50 -50 -50 0 0 50 50 100 100 100 100 100 100 150 150 150 150 150 150 Temperature (ºC) 1634 1634 1636 1636 1638 1638 1640 1640 1648 1648 1644 1644 1650 1650 1646 1646 1652 1652 V (mV) IOUT(Q) Temperature (ºC) Sensitivity (mV/A) Temperature (ºC) Sensitivity Error (%) Temperature (ºC) Total Error (%) Temperature (ºC) Nonlinearity (%) -1.00 -6 -0.80 -0.40 -2 -0.20 0.00 0 0.20 0.80 40.60 1.00 6 +3 Sigma Average -3 Sigma 0.40 2 -0.60 1642 1642 xLLCTR-20AB Key Parameters

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Zero Current Output Voltage vs. Temperature Offset Voltage vs. Temperature Sensitivity vs. Temperature Nonlinearity vs. Temperature Total Error at I vs. TemperaturePR(max) Sensitivity Error vs. Temperature Temperature (ºC) Offset Voltage (mV) -50 -50 -50 -50 -50 -50 0 0 50 50 100 100 100 100 100 100 150 150 150 150 150 150 Temperature (ºC) 129 310 -20 130 315 -15 132 133 320 -10 137 325 -5 138 335 5 135 330 0 139 340 10 V (mV) IOUT(Q) Temperature (ºC) Sensitivity (mV/A) Temperature (ºC) Sensitivity Error (%) Temperature (ºC) Total Error (%) Temperature (ºC) Nonlinearity (%) -1.00 -5 -0.80 -4 -0.40 -2 -0.20 -1 0.00 0 0.20 1 0.80 4 0.60 3 1.00 5 +3 Sigma Average -3 Sigma 0.40 2 -0.60 -3 136 131 134 xLLCTR-20AU Key Parameters

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Zero Current Output Voltage vs. Temperature Offset Voltage vs. Temperature Sensitivity vs. Temperature Nonlinearity vs. Temperature Total Error at I vs. TemperaturePR(max) Sensitivity Error vs. Temperature Temperature (ºC) Offset Voltage (mV) -50 -50 -50 -50 -50 -50 0 0 50 50 100 100 100 100 100 100 150 150 150 150 150 150 Temperature (ºC) 1634 -16 1636 -14 1640 -10 1642 -8 1650 0 1652 2 1646 -4 1654 4 V (mV) IOUT(Q) Temperature (ºC) Sensitivity (mV/A) Temperature (ºC) Sensitivity Error (%) Temperature (ºC) Total Error (%) Temperature (ºC) Nonlinearity (%) -1.00 -5 -0.80 -4 -0.40 -2 -0.20 -1 0.00 0 0.20 1 0.80 4 0.60 3 1.00 5 +3 Sigma Average -3 Sigma 0.40 2 -0.60 -3 1648 -2 1638 -12 1644 -6 xLLCTR-40AB Key Parameters

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Zero Current Output Voltage vs. Temperature Offset Voltage vs. Temperature Sensitivity vs. Temperature Nonlinearity vs. Temperature Total Error at I vs. TemperaturePR(max) Sensitivity Error vs. Temperature Temperature (ºC) Offset Voltage (mV) -50 -50 -50 -50 -50 -50 0 0 50 50 100 100 100 100 100 100 150 150 150 150 150 150 Temperature (ºC) 310 -20 315 -15 320 -10 325 -5 340 10 330 0 345 15 V (mV) IOUT(Q) Temperature (ºC) Sensitivity (mV/A) Temperature (ºC) Sensitivity Error (%) Temperature (ºC) Total Error (%) Temperature (ºC) Nonlinearity (%) -1.00 -5 -0.80 -4 -0.40 -2 -0.20 -1 0.00 0 0.20 1 0.80 4 0.60 3 1.00 5 +3 Sigma Average -3 Sigma 0.40 2 -0.60 -3 335 5 xLLCTR-40AU Key Parameters

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com 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 sen- sor IC is over the full current measurement range. The nonlinear- ity is calculated as: 1– [ { [ { VIOUT (IPR(max)) – VIOUT(Q) × 100 (%)ELIN = 2 × VIOUT (IPR(max)/2) – VIOUT(Q) 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 × VCC for a bidirectional device and 0.1 × 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. Offset Voltage (VOE) The deviation of the device output from its ideal quiescent value of 0.5 × V CC (bidirectional) or 0.1 × 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 (I P), 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) VIOUT_ideal(IP) – VIOUT(IP) Sensideal(IP) × IP × 100 (%)= The Total Output Error incorporates all sources of error and is a function of I P . At relatively high currents, E TOT will be mostly DEFINITIONS OF ACCURACY CHARACTERISTICS Figure 1: Output Voltage versus Sensed Current Figure 2: 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 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 Figures 1 and 2. Figure 1 shows a distribution of output voltages versus IP at 25°C and across temperature. Figure 2 shows the correspond- ing ETOT versus IP .

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Impact of External Magnetic Fields The ACS722 works by sensing the magnetic field created by the current flowing through the package. However, the sensor cannot differentiate between fields created by the current flow and exter- nal magnetic fields. This means that external magnetic fields can cause errors in the output of the sensor. Magnetic fields which are perpendicular to the surface of the package affect the output of the sensor, as it only senses fields in that one plane. The error in Amperes can be quantified as: Error(B) = B CF where B is the strength of the external field perpendicular to the surface of the package in Gauss, and CF is the coupling factor in G/A. Then, multiplying by the sensitivity of the part, Sens, gives the error in mV . For example, an external field of 1 Gauss will result in around 0.1 A of error. If the ACS722LLCTR-10AB, which has a nominal sensitivity of 132 mV/A, is being used, that equates to 13.2 mV of error on the output of the sensor. External Field (Gauss) Error (A) Error (mV) 5AB 10AB 20AB 40AB

APPLICATION INFORMATION

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Thermal Rise vs. Primary Current Self-heating due to the flow of current should be considered dur- ing 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. 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 3 shows the measured rise in steady-state die temperature of the ACS722 versus continuous current at an ambi- ent temperature, T A, of 25 °C. The thermal offset curves may be directly applied to other values of TA. Conversely, Figure 4 shows the maximum continuous current at a given TA. Surges beyond the maximum current listed in Figure 4 are allowed given the maxi- mum junction temperature, TJ(MAX) (165℃), is not exceeded. Figure 3: Self-Heating in the LC2 Package Due to Current Flow Figure 4: Maximum Continuous Current at a Given TA The thermal capacity of the ACS722 should be verified by the end user in the application’s specific conditions. The maximum junction temperature, T J(MAX) (165℃), 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. ASEK722 Evaluation Board Layout Thermal data shown in Figure 3 was collected using the ASEK722 Evaluation Board (TED-85-0593-002). This board includes 1388 mm2 of 4 oz. copper (0.1388) 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 5. Figure 5: Top and Bottom Layers for ASEK722 Evaluation Board Gerber files for the ASEK722 evaluation board are available for download from the Allegro website. See the technical documents section of the ACS722 device webpage.

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 PackageACS722 Allegro MicroSystems 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 operating voltage, the device requires a finite time to power its internal components before responding to an input magnetic field. Power-On Time, t PO , 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 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 band- width of the current sensor IC, in which ƒ(–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. 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. 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 6: Power-On Time (tPO) Figure 7: Rise Time (tr) and Propagation Delay (tpd ) Figure 8: Response Time (tRESPONSE)

1.27 BSC

A B B C 2 1 Branding scale and appearance at supplier discretion C SEATING PLANEC0.10

0.25 BSC

1.04 REF

1.75 MAX

1.75 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 Branded Face 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 SEATING PLANE GAUGE PLANE PCB Layout Reference View NNNNNNN TPP-AAA LLLLL N = Device part number T= Device temperature range P= Package Designator A=Amperage L= Lot number Belly Brand = Country of Origin 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 PACKAGE OUTLINE DRAWING

REVISION HISTORY

– June 10, 2014 Initial release. 1 October 29, 2014 Added Magnetic Coupling Factor characteristic and Error Due to External Magnetic Fields section

2 April 29, 2015 Added Characteristic Performance graphs

3 December 11, 2018 Updated certificate numbers

4 June 3, 2019 Updated TUV certificate mark

5 September 3, 2019 Added Maximum Continuous Current to Absolute Maximum Ratings table (page 3) and thermal data section (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.

Summary

High Accuracy, Galvanically Isolated Current Sensor IC with Small Footprint SOIC8 Package September 3, 2019 REVISION 5

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