CTD450-12U

CT450 ALLEGRO

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Technical content

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A. www.allegromicro.com SELECTION GUIDE Part Number Automotive Grade Range (mT) Operating Temperature Range (°C) Package Packing BIPOLAR SENSITIVITY CT450-H06MRSN08 – ±6 –40 to 125 8-lead SOIC 4.89 mm × 6.00 mm × 1.62 mm Tape and ReelCT450-H12MRSN08 – ±12 CT450-H24MRSN08 – ±24 CT450-H06MRTS08 – ±6 –40 to 125 8-lead TSSOP 3.00 mm × 6.40 mm × 1.10 mm Tape and ReelCT450-H12MRTS08 – ±12 CT450-H24MRTS08 – ±24 UNIPOLAR SENSITIVITY CT450-H06DRSN08 – 6 –40 to 125 8-lead SOIC 4.89 mm × 6.00 mm × 1.62 mm Tape and ReelCT450-H12DRSN08 – 12 CT450-H24DRSN08 – 24 CT450-H06DRTS08 – 6 –40 to 125 8-lead TSSOP 3.00 mm × 6.40 mm × 1.10 mm Tape and ReelCT450-H12DRTS08 – 12 CT450-H24DRTS08 – 24 PROGRAMMABLE SENSITIVITY CT450-H00MRSN08 – ±6 to ±24 –40 to 125 8-lead SOIC 4.89 mm × 6.00 mm × 1.62 mm Tape and ReelCT450-H00DRSN08 – 6 to 24 CT450-H00MRTS08 – ±6 to ±24 –40 to 125 8-lead TSSOP 3.00 mm × 6.40 mm × 1.10 mm Tape and ReelCT450-H00DRTS08 – 6 to 24 Table of Contents

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com EVALUATION BOARD SELECTION GUIDE Part Number Magnetic Field Range (mT) Operating Temperature Range (°C) Package CTD450-06U 0 to 6 –40 to 125 8-lead SOIC 4.89 mm × 6.00 mm × 1.62 mm CTD450-06B ±6 CTD450-12U 0 to 12 CTD450-12B ±12 CTD450-24U 0 to 24 CTD450-24B ±24 ABSOLUTE MAXIMUM RATINGS [1] Characteristic Symbol Notes Rating Unit Supply Voltage Strength VCC –0.3 to 6.0 V Analog Input/Output Pins Maximum Voltage VI/O –0.3 to VCC + 0.3 [2] V Electrostatic Discharge Protection Level ESD Human Body Model (HBM) per JESD22-A114 ±2.0 (min) kV Charged Device Model (CDM) per JESD22-C101 ±0.5 (min) kV Junction Temperature TJ –40 to 150 °C Storage Temperature TSTG –65 to 155 °C Lead Soldering Temperature TL 10 seconds 260 °C [1] Stresses exceeding the absolute maximum ratings may damage the CT450 and may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. [2] The lower of VCC + 0.3 V or 6.0 V. RECOMMENDED OPERATING CONDITIONS [1] Characteristic Symbol Notes Min. Typ. Max. Unit Supply Voltage Range VCC 4.75 5.00 5.50 V Output Voltage Range VOUT 0 – VCC V Output Current IOUT – – ±1.0 mA Operating Ambient Temperature TA Industrial –40 25 85 °C Extended Industrial –40 25 125 °C [1] The Recommended Operating Conditions table defines the conditions for actual operation of the CT450. Recommended operating conditions are specified to ensure optimal performance to the specifications. Allegro does not recommend exceeding them or designing to absolute maximum ratings.

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com APPLICATION DIAGRAMS Figure 3: CT450 Application Diagram for SOIC-8 Table 1: Recommended External Components Component Description Vendor and Part Number Min. Typ. Max. Unit CBYP 1.0 µF, X5R or better Murata GRM155C81A105KA12 – 1.0 – µF CFILTER Various, X5R or better Murata – Figure 27 – pF Figure 4: CT450 Application Diagram for TSSOP-8 Table 2: Recommended External Components Component Description Vendor and Part Number Min. Typ. Max. Unit CBYP 1.0 µF, X5R or better Murata GRM155C81A105KA12 – 1.0 – µF CFILTER Various, X5R or better Murata – Figure 27 – pF RVREF 10 kΩ resistor Various – 10 – kΩ

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Terminal List Number Name Function 1, 2, 3, 4 LDF Lead frame Pin – A single (1) LDF pin should be connected to GND. The other three (3) LDF pins should be left unconnected to avoid ground loops through the lead frame. 5 GND Ground. 6 FILTER Filter pin to improve noise performance by connecting an external capacitor to set the cutoff frequency. No connect if the FILTER pin is not used. 7 OUT Analog output voltage that represents the measured current/field. 8 VCC Supply voltage. PINOUT DIAGRAMS AND TERMINAL LISTS Figure 5: CT450 Pinout Diagram for 8-lead SOIC Package (Top-Down View)

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Terminal List Number Name Function 1 OUT Analog output voltage that represents the measured current/field. 2 VCC Supply voltage. 3, 4, 5 NC No connect (do not use). 6 VREF Reference voltage output. If not used, then do not connect. 7 GND Ground. 8 FILTER Filter pin to improve noise performance by connecting an external capacitor to set the cutoff frequency. No connect if the FILTER pin is not used. Figure 6: CT450 Pinout Diagram for 8-lead TSSOP Package (Top-Down View)

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ELECTRICAL CHARACTERISTICS: Valid for VCC = 4.75 to 5.50 V, CBYP = 1.0 µF, and TA = –40°C to 125°C, typical values are VCC = 5.00 V and TA = 25°C, unless otherwise specified Characteristics Symbol Test Conditions Min. Typ. Max. Unit POWER SUPPLIES Supply Current ICC fBW = 1 MHz, no load, BOP = 0 mT – 6.0 9.0 mA OUT Maximum Drive Capability IOUT OUT covers 10% to 90% of VCC span –1.0 – +1.0 mA OUT Capacitive Load CL_OUT – – 100 pF OUT Resistive Load RL_OUT – 100 – kΩ Internal Filter Resistance [1] RFILTER – 15 – kΩ Power Supply Rejection Ratio [1] PSRR – 35 – dB Sensitivity Power Supply Rejection Ratio [1] SPSRR – 35 – dB Offset Power Supply Rejection Ratio [1] OPSRR – 40 – dB ANALOG OUTPUT (OUT) OUT Voltage Linear Range VOUT VSIG_AC = ±2.00 V, VSIG_DC = +4.00 V 0.50 – 4.50 V Output High Saturation Voltage VOUT_SAT TA = 25°C VCC – 0.30 VCC – 0.25 – V REFERENCE VOLTAGE (VREF) FOR TSSOP-8 ONLY Reference Voltage VREF Unipolar variant – 0.50 – V Bipolar variant – 2.50 – V VREF Maximum Drive Capability IVREF TSSOP-8 variant only –50 – 50 µA VREF Capacitive Load CL_VREF TSSOP-8 variant only – – 10 pF VREF Resistive Load RL_VREF TSSOP-8 variant only – 10 – kΩ TIMINGS Power-On Time tON VCC ≥ 4.0 V – 100 200 µs Rise Time [1] tRISE BOP = BOP(MAX), TA = 25°C, CL = 100 pF – 200 – ns Response Time [1] tRESPONSE BOP = BOP(MAX), TA = 25°C, CL = 100 pF – 300 – ns Propagation Delay [1] tDELAY BOP = BOP(MAX), TA = 25°C, CL = 100 pF – 250 – ns PROTECTION Undervoltage Lockout VUVLO Rising VCC – 2.50 – V Falling VCC – 2.45 – V UVLO Hysteresis VUV_HYS – 50 – mV [1] Guaranteed by design and characterization; not tested in production.

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com

ELECTRICAL CHARACTERISTICS

VCC = 5.00 V, TA = 25°C, and CBYP = 1.0 µF (unless otherwise specified) Figure 7: CT450 Supply Current vs. Temperature vs. Supply Voltage Figure 8: CT450 Bandwidth with CFILTER = 1.0 pF Figure 9: CT450 Startup Waveforms for VOQ = 0.50 V (Unipolar Sensor Variant) Figure 10: CT450 Startup Waveforms for VOQ = 2.50 V (Bipolar Sensor Variant)

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com ELECTRICAL CHARACTERISTICS (continued) VCC = 5.00 V, TA = 25°C, and CBYP = 1.0 µF (unless otherwise specified) Figure 11: CT450 Response Time; BOP = 12 mT and CL = 100 pF (Blue = B Field, Red = VOUT) Figure 12: CT450 Rise Time; BOP = 12 mT and CL = 100 pF (Blue = B Field, Red = VOUT) Figure 13: CT450 Propagation Delay; BOP = 12 mT and CL = 100 pF (Blue = B Field, Red = VOUT)

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com CT450-x06DR: 0 to 6 mT – ELECTRICAL CHARACTERISTICS: Valid for VCC = 4.75 to 5.50 V, CBYP = 1.0 µF, and TA = –40°C to 125°C, typical values are VCC = 5.00 V and TA = 25°C, unless otherwise specified Characteristics Symbol Test Conditions Min. Typ. Max. Unit Magnetic Field Range BRNG 0 – 6 mT Voltage Output Quiescent VOQ TA = 25°C, BOP = 0 mT 0.495 0.500 0.505 V Sensitivity S BRNG(MIN) < BOP < BRNG(MAX) – 666.7 – mV/mT Bandwidth [1] fBW Small Signal = –3 dB – 1.0 – MHz Noise [1] eN TA = 25°C, fBW = 100 kHz – 1.63 – mVRMS – 2.45 – µTRMS OUT ACCURACY PERFORMANCE Non-Linearity Error ELIN – ±0.2 – % FS Sensitivity Error ESENS – ±0.3 – % FS Offset Voltage VOFFSET BOP = 0 mT – ±0.3 – % FS LIFETIME DRIFT Total Output Error Lifetime Drift ETOT_DRIFT – ±1.0 – % FS [1] Guaranteed by design and characterization; not tested in production. ELECTRICAL CHARACTERISTICS FOR CT450-x06DR VCC = 5.0 V, TA = 25°C, and CBYP = 1.0 µF (unless otherwise specified) Figure 14: Total Output Error vs. B Field vs. Temperature Figure 15: Noise Density vs. Frequency

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com CT450-x06MR: ±6 mT – ELECTRICAL CHARACTERISTICS: Valid for VCC = 4.75 to 5.50 V, CBYP = 1.0 µF, and TA = –40°C to 125°C, typical values are VCC = 5.00 V and TA = 25°C, unless otherwise specified Characteristics Symbol Test Conditions Min. Typ. Max. Unit Magnetic Field Range BRNG –6 – 6 mT Voltage Output Quiescent VOQ TA = 25°C, BOP = 0 mT 2.490 2.500 2.510 V Sensitivity S BRNG(MIN) < BOP < BRNG(MAX) – 333.3 – mV/mT Bandwidth [1] fBW Small Signal = –3 dB – 1.0 – MHz Noise [1] eN TA = 25°C, fBW = 100 kHz – 0.92 – mVRMS – 2.77 – µTRMS OUT ACCURACY PERFORMANCE Non-Linearity Error ELIN – ±0.1 – % FS Sensitivity Error ESENS – ±0.3 – % FS Offset Voltage VOFFSET BOP = 0 mT – ±0.2 – % FS LIFETIME DRIFT Total Output Error Lifetime Drift ETOT_DRIFT – ±1.0 – % FS [1] Guaranteed by design and characterization; not tested in production. ELECTRICAL CHARACTERISTICS FOR CT450-x06MR VCC = 5.0 V, TA = 25°C, and CBYP = 1.0 µF (unless otherwise specified) Figure 16: Total Output Error vs. B Field vs. Temperature Figure 17: Noise Density vs. Frequency

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com CT450-x12DR: 0 to 12 mT – ELECTRICAL CHARACTERISTICS: Valid for VCC = 4.75 to 5.50 V, CBYP = 1.0 µF, and TA = –40°C to 125°C, typical values are VCC = 5.00 V and TA = 25°C, unless otherwise specified Characteristics Symbol Test Conditions Min. Typ. Max. Unit Magnetic Field Range BRNG 0 – 12 mT Voltage Output Quiescent VOQ TA = 25°C, BOP = 0 mT 0.495 0.500 0.505 V Sensitivity S BRNG(MIN) < BOP < BRNG(MAX) – 333.3 – mV/mT Bandwidth [1] fBW Small Signal = –3 dB – 1.0 – MHz Noise [1] eN TA = 25°C, fBW = 100 kHz – 1.30 – mVRMS – 3.90 – µTRMS OUT ACCURACY PERFORMANCE Non-Linearity Error ELIN – ±0.2 – % FS Sensitivity Error ESENS – ±0.3 – % FS Offset Voltage VOFFSET BOP = 0 mT – ±0.2 – % FS LIFETIME DRIFT Total Output Error Lifetime Drift ETOT_DRIFT – ±1.0 – % FS [1] Guaranteed by design and characterization; not tested in production. ELECTRICAL CHARACTERISTICS FOR CT450-x12DR VCC = 5.0 V, TA = 25°C, and CBYP = 1.0 µF (unless otherwise specified) Figure 18: Total Output Error vs. B Field vs. Temperature Figure 19: Noise Density vs. Frequency

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com CT450-x12MR: ±12 mT – ELECTRICAL CHARACTERISTICS: Valid for VCC = 4.75 to 5.50 V, CBYP = 1.0 µF, and TA = –40°C to 125°C, typical values are VCC = 5.00 V and TA = 25°C, unless otherwise specified Characteristics Symbol Test Conditions Min. Typ. Max. Unit Magnetic Field Range BRNG –12 – 12 mT Voltage Output Quiescent VOQ TA = 25°C, BOP = 0 mT 2.490 2.500 2.510 V Sensitivity S BRNG(MIN) < BOP < BRNG(MAX) – 166.7 – mV/mT Bandwidth [1] fBW Small Signal = –3 dB – 1.0 – MHz Noise [1] eN TA = 25°C, fBW = 100 kHz – 0.75 – mVRMS – 4.50 – µTRMS OUT ACCURACY PERFORMANCE Non-Linearity Error ELIN – ±0.1 – % FS Sensitivity Error ESENS – ±0.3 – % FS Offset Voltage VOFFSET BOP = 0 mT – ±0.2 – % FS LIFETIME DRIFT Total Output Error Lifetime Drift ETOT_DRIFT – ±1.0 – % FS [1] Guaranteed by design and characterization; not tested in production. ELECTRICAL CHARACTERISTICS FOR CT450-x12MR VCC = 5.0 V, TA = 25°C, and CBYP = 1.0 µF (unless otherwise specified) Figure 20: Total Output Error vs. B Field vs. Temperature Figure 21: Noise Density vs. Frequency

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com CT450-x24DR: 0 to 24 mT – ELECTRICAL CHARACTERISTICS: Valid for VCC = 4.75 to 5.50 V, CBYP = 1.0 µF, and TA = –40°C to 125°C, typical values are VCC = 5.00 V and TA = 25°C, unless otherwise specified Characteristics Symbol Test Conditions Min. Typ. Max. Unit Magnetic Field Range BRNG 0 – 24 mT Voltage Output Quiescent VOQ TA = 25°C, BOP = 0 mT 0.495 0.500 0.505 V Sensitivity S BRNG(MIN) < BOP < BRNG(MAX) – 166.7 – mV/mT Bandwidth [1] fBW Small Signal = –3 dB – 1.0 – MHz Noise [1] eN TA = 25°C, fBW = 100 kHz – 0.46 – mVRMS – 2.77 – µTRMS OUT ACCURACY PERFORMANCE Non-Linearity Error ELIN – ±0.3 – % FS Sensitivity Error ESENS – ±0.3 – % FS Offset Voltage VOFFSET BOP = 0 mT – ±0.2 – % FS LIFETIME DRIFT Total Output Error Lifetime Drift ETOT_DRIFT – ±1.0 – % FS [1] Guaranteed by design and characterization; not tested in production. ELECTRICAL CHARACTERISTICS FOR CT450-x24DR VCC = 5.0 V, TA = 25°C, and CBYP = 1.0 µF (unless otherwise specified) Figure 22: Total Output Error vs. B Field vs. Temperature Figure 23: Noise Density vs. Frequency

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com CT450-x24MR: ±24 mT – ELECTRICAL CHARACTERISTICS: Valid for VCC = 4.75 to 5.50 V, CBYP = 1.0 µF, and TA = –40°C to 125°C, typical values are VCC = 5.00 V and TA = 25°C, unless otherwise specified Characteristics Symbol Test Conditions Min. Typ. Max. Unit Magnetic Field Range BRNG –24 – 24 mT Voltage Output Quiescent VOQ TA = 25°C, BOP = 0 mT 2.490 2.500 2.510 V Sensitivity S BRNG(MIN) < BOP < BRNG(MAX) – 83.3 – mV/mT Bandwidth [1] fBW Small Signal = –3 dB – 1.0 – MHz Noise [1] eN TA = 25°C, fBW = 100 kHz – 0.38 – mVRMS – 4.56 – µTRMS OUT ACCURACY PERFORMANCE Non-Linearity Error ELIN – ±0.1 – % FS Sensitivity Error ESENS – ±0.3 – % FS Offset Voltage VOFFSET BOP = 0 mT – ±0.3 – % FS LIFETIME DRIFT Total Output Error Lifetime Drift ETOT_DRIFT – ±1.0 – % FS [1] Guaranteed by design and characterization; not tested in production. ELECTRICAL CHARACTERISTICS FOR CT450-x24MR VCC = 5.0 V, TA = 25°C, and CBYP = 1.0 µF (unless otherwise specified) Figure 24: Total Output Error vs. B Field vs. Temperature Figure 25: Noise Density vs. Frequency

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com CT450-x00MR: Programmable Gain – ELECTRICAL CHARACTERISTICS: Valid for VCC = 4.75 to 5.50 V, CBYP = 1.0 µF, and TA = –40°C to 125°C, typical values are VCC = 5.00 V and TA = 25°C, unless otherwise specified Characteristics Symbol Test Conditions Min. Typ. Max. Unit Programmable Magnetic Field Range BPRNG ±6 – ±24 mT Voltage Output Quiescent VOQ TA = 25°C, BOP = 0 mT 2.490 2.500 2.510 V Maximum Programmable Sensitivity SPMAX BRNG(MIN) < BOP < BRNG(MAX) – 333.3 – mV/mT Minimum Programmable Sensitivity SPMIN BRNG(MIN) < BOP < BRNG(MAX) – 83.4 – mV/mT Bandwidth [1] fBW Small Signal = –3 dB – 1.0 – MHz OUT ACCURACY PERFORMANCE Non-Linearity Error ELIN – ±0.2 – % FS Sensitivity Error ESENS – ±0.3 – % FS Offset Voltage VOFFSET BOP = 0 mT – ±0.3 – % FS LIFETIME DRIFT Total Output Error Lifetime Drift ETOT_DRIFT – ±1.0 – % FS [1] Guaranteed by design and characterization; not tested in production. Calibration Description The CT450-x00MR is factory-trimmed for sensitivity and offset temperature drift. The sensor provides the ability to adjust gain to allow for all the mechanical tolerances during manufacturing. Gain calibration is recommended to be performed at room temperature (25°C) using the Allegro CTC4000 Calibration Box.

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com CT450-x00DR: Programmable Gain – ELECTRICAL CHARACTERISTICS: Valid for VCC = 4.75 to 5.50 V, CBYP = 1.0 µF, and TA = –40°C to 125°C, typical values are VCC = 5.00 V and TA = 25°C, unless otherwise specified Characteristics Symbol Test Conditions Min. Typ. Max. Unit Programmable Magnetic Field Range BPRNG 6 – 24 mT Voltage Output Quiescent VOQ TA = 25°C, BOP = 0 mT 0.495 0.500 0.505 V Maximum Programmable Sensitivity SPMAX BRNG(MIN) < BOP < BRNG(MAX) – 666.7 – mV/mT Minimum Programmable Sensitivity SPMIN BRNG(MIN) < BOP < BRNG(MAX) – 166.7 – mV/mT Bandwidth [1] fBW Small Signal = –3 dB – 1.0 – MHz OUT ACCURACY PERFORMANCE Non-Linearity Error ELIN – ±0.3 – % FS Sensitivity Error ESENS – ±0.3 – % FS Offset Voltage VOFFSET BOP = 0 mT – ±0.3 – % FS LIFETIME DRIFT Total Output Error Lifetime Drift ETOT_DRIFT – ±1.0 – % FS [1] Guaranteed by design and characterization; not tested in production. Calibration Description The CT450-x00DR is factory-trimmed for sensitivity and offset temperature drift. The sensor provides the ability to adjust gain to allow for all the mechanical tolerances during manufacturing. Gain calibration is recommended to be performed at room temperature (25°C) using the Allegro CTC4000 Calibration Box.

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com FUNCTIONAL DESCRIPTION Overview The CT450 is a very high accuracy contactless current sensor that can sense magnetic fields from 6 to 24 mT. The device has high sensitivity and a wide dynamic range with excellent accuracy (low total output error) across temperature. This current sensor supports six field ranges as standard and can also be user-programmable:

• 0 to 6 mT
• ±6 mT
• 0 to 12 mT
• ±12 mT
• 0 to 24 mT
• ±24 mT The CT450 is also available in a user-programmable variant which enables end-of-line calibration of gain. While the sensor is pre-pro- grammed to adjust sensitivity and offset temperature drift, the ability to adjust gain relaxes mechanical tolerances during sensor mounting. When current is flowing through a busbar above or below the CT450, the XtremeSense TMR sensor inside the chip senses the field which in turn generates a differential voltage signals that then goes through the Analog Front-End (AFE) to output a current mea- surement as low as ±1.0% full-scale total output error (EOUT). The chip is designed to enable a fast response time of 300 ns for the current measurement from the OUT pin as the bandwidth for the CT450 is 1.0 MHz. Even with a high bandwidth, the chip consumes a minimal amount of power. Linear Output Current Measurement The CT450 provides a continuous linear analog output voltage which represents the current measurement. The output voltage range of OUT is from 0.50 to 4.50 V with a VOQ of 0.50 V and 2.50 V for unidirectional and bidirectional currents, respectively. Figure 26 illustrates the output voltage range of the OUT pin as a function of the measured current. Figure 26: Linear Output Voltage Range (OUT) vs. Measured Magnetic Field (BOP) Voltage Reference Function (VREF) The CT450 in TSSOP-8 package has a reference voltage (VREF) pin that may be used as an output voltage reference for AC or DC field/current measurements. The VREF pin should be connected to a buffer circuit. If VREF is not used, then it should be left unconnected. Filter Function (FILTER) The CT450 has a pin for the FILTER function which will enable it to improve the noise performance by changing the cutoff fre- quency. The bandwidth of the CT450 is 1.0 MHz; however, add- ing a capacitor to the FILTER pin—which will be in-series with an internal resistance of approximately 15 kΩ—will set the cutoff frequency to reduce noise. Figure 27 shows the capacitor values required to achieve different cutoff frequencies. Experimentally measured bandwidth does not necessarily match the calculated bandwidth value obtained by using the equation because of the parasitic capacitances due to PCB manufacturing and layout. This is further impacted by the small, picofarad level CFILTER recommendations. Figure 27: Bandwidth vs. CFILTER Total Output Error The Total Output Error (EOUT) is the maximum deviation of the sensor output from the ideal sensor transfer curve over the full temperature range relative to the sensor full scale. The Total Output Error is measured by performing a full-scale primary current (IP) sweep and measuring VOUT at multiple points.

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com The Ideal Transfer Curve is calculated based on datasheet param- eters as described below. EOUT incorporates all sources of error and is a function of the sensed current (IP) from the current sensor. Figure 28: Total Output Error (EOUT) vs. Field (BOP) The CT450 achieves a total output error (EOUT) that is less than ±1.0% of Full-Scale (FS) over supply voltage and temperature. It is designed with innovative and proprietary TMR sensors and circuit blocks to provide very accurate magnetic field measure- ments regardless of the operating conditions. Power-On Time (tON) Power-On Time (tON) of 100 µs is the amount of time required by CT450 to start up, fully power the chip, and becoming fully operational from the moment the supply voltage is greater than the UVLO voltage. This time includes the ramp-up time and the settling time (within 10% of steady-state voltage under an applied magnetic field) after the power supply has reached the minimum VCC. Response Time (tRESPONSE) Response Time (tRESPONSE) of 300 ns for the CT450 is the time interval between the following terms: 1. When the primary current signal reaches 90% of its final value, 2. When the chip reaches 90% of its output corresponding to the applied current. Figure 29: CT450 Response Time Curve Rise Time (tRISE) Rise Time (tRISE) is the time interval of when it reaches 10% and 90% of the full-scale output voltage. The tRISE of the CT450 is 200 ns. Propagation Delay (tDELAY) Propagation Delay (tDELAY) is the time difference between these two events: 1. When the primary current reaches 20% of its final value 2. When the chip reaches 20% of its output corresponding to the applied current. The CT450 has a propagation delay of 250 ns.

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 30: CT450 Propagation Delay and Rise Time Curve Undervoltage Lockout (UVLO) The Undervoltage Lockout protection circuitry of the CT450 is activated when the supply voltage (VCC) falls below 2.45 V . The CT450 remains in a low quiescent state until VCC rises above the UVLO threshold (2.50 V). In this condition where VCC is less than 2.45 V and UVLO is triggered, the output from the CT450 is not valid. Once VCC rises above 4.0 V , then the UVLO is cleared. Current Sensing The CT450 can sense and therefore measure the current by either placing a current-carrying busbar above or under the device. The busbar should be placed crosswise or over the pins of the package for the CT450 (in SOIC-8) to measure the current. The chip is also sensitive enough to measure the current from a PCB trace that is routed beneath it. Bypass Capacitor A single 1.0 µF capacitor is needed for the VCC pin to reduce the noise from the power supply and other circuits. This capacitor should be placed as close as possible to the CT450 to minimize inductance and resistance between the two devices. VREF Resistors (TSSOP-8) In designs where the VREF pin of the CT450 in TSSOP-8 is used, a 10 kΩ resistor must be connected as close to the pin as possible in series with a load. If the VREF pin is not needed in the application, then this pin should not be connected and be left floating. Recommended PCB Layout The CT450 is able to sense the field generated by the current flowing through a Printed Circuit Board (PCB) trace or busbar. Figure 31 shows the schematic for the CTD450 which is the evaluation board for the CT450. Figure 31: CTD450 Evaluation Board Schematic The PCB layout of the CTD450 is shown in Figure 32 where the CT450 can sense the current through the PCB trace on the bottom layer of a 4-layer PCB. The width of the PCB trace and the thick- ness of the copper used will dictate the amount of current that it can carry. Use the Allegro Contactless Current Sensor Calculator to set the parameters to determine the amount of current the PCB trace (or busbar) can support. For the implementation of the current trace on the bottom layer, a distance of 1.60 mm between the IC pads on the top side of the PCB to the bottom layer of the trace will yield an isolation volt- age that is greater than 5.0 kV .

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 32: CTD450 Evaluation Board PCB Layout Figure 33: CTD450 Evaluation Board PCB Layout

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com XtremeSense TMR Current Sensor Location The XtremeSense TMR current sensor location of the CT450 is shown below. All dimensions in the figures are nominal. Figure 34: XtremeSense TMR Current Sensor Location in x-y Plane for CT450 in SOIC-8 Package Figure 35: XtremeSense TMR Current Sensor Location in z Dimension for CT450 in SOIC-8 Package Figure 36: XtremeSense TMR Current Sensor Location in x-y Plane for CT450 in TSSOP-8 Package Figure 37: XtremeSense TMR Current Sensor Location in z Dimension for CT450 in TSSOP-8 Package

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com PACKAGE OUTLINE DRAWINGS Figure 38: SOIC-8 Package Drawing and Dimensions Table 3: CT450 SOIC-8 Package Dimensions Symbol Dimensions in Millimeters (mm) Min. Typ. Max. A1 0.10 0.18 0.25 b 0.36 0.41 0.46 C 0.19 0.22 0.25 D 4.80 4.89 4.98 E 3.81 3.90 3.99 e 1.27 BSC H 5.80 6.00 6.20 h 0.25 0.37 0.50 L 0.41 – 1.27 A 1.52 1.62 1.72 α 0° – 8° ZD 0.53 REF A2 1.37 1.47 1.57

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com Figure 39: TSSOP-8 Package Drawing and Dimensions Table 4: CT450 TSSOP-8 Package Dimensions Symbol Dimensions in Millimeters (mm) Min. Typ. Max. A 1.05 1.10 1.20 A1 0.05 0.10 0.15 A2 – 1.00 1.05 b 0.25 – 0.30 C – 0.127 – D 2.90 3.05 3.10 E 6.20 6.40 6.60 E1 4.30 4.40 4.50 e – 0.65 – L 0.50 0.60 0.70 y – – 0.076 θ 0° 4° 8°

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com TAPE AND REEL POCKET DRAWINGS AND DIMENSIONS Figure 40: Tape and Pocket Drawing for SOIC-8 Package Figure 41: Tape and Pocket Drawing for TSSOP-8 Package

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com

PACKAGE INFORMATION

Table 5: CT450 Package Information Part Number Package Type # of Leads Package Quantity Lead Finish MSL Rating [2] Operating Temperature (°C) [3] Device Marking [4] CT450-H06DRSN08 SOIC 8 2000 Sn 3 –40 to 125 CT450 06DR YYWWLL CT450-H06MRSN08 SOIC 8 2000 Sn 3 –40 to 125 CT450 06MR YYWWLL CT450-H06DRTS08 TSSOP 8 3000 Sn 1 –40 to 125 CT450-06DR YYWWLL CT450-H06MRTS08 TSSOP 8 3000 Sn 1 –40 to 125 CT450-06MR YYWWLL CT450-H12DRSN08 SOIC 8 2000 Sn 3 –40 to 125 CT450 12DR YYWWLL CT450-H12MRSN08 SOIC 8 2000 Sn 3 –40 to 125 CT450 12MR YYWWLL CT450-H12DRTS08 TSSOP 8 3000 Sn 1 –40 to 125 CT450-12DR YYWWLL CT450-H12MRTS08 TSSOP 8 3000 Sn 1 –40 to 125 CT450-12MR YYWWLL CT450-H24DRSN08 SOIC 8 2000 Sn 3 –40 to 125 CT450 24DR YYWWLL CT450-H24MRSN08 SOIC 8 2000 Sn 3 –40 to 125 CT450 24MR YYWWLL CT450-H24DRTS08 TSSOP 8 3000 Sn 1 –40 to 125 CT450-24DR YYWWLL CT450-H24MRTS08 TSSOP 8 3000 Sn 1 –40 to 125 CT450-24MR YYWWLL CT450-H00DRSN08 SOIC 8 2000 Sn 3 –40 to 125 CT450 24MR YYWWLL CT450-H00MRSN08 SOIC 8 2000 Sn 3 –40 to 125 CT450 24DR YYWWLL CT450-H00DRTS08 TSSOP 8 3000 Sn 1 –40 to 125 CT450-24MR YYWWLL CT450-H00MRTS08 TSSOP 8 3000 Sn 1 –40 to 125 CT450-00DR YYWWLL [1] RoHS is defined as semiconductor products that are compliant to the current EU RoHS requirements. It also will meet the requirement that RoHS substances do not exceed 0.1% by weight in homogeneous materials. Green is defined as the content of chlorine (Cl), bromine (Br), and antimony trioxide based flame retardants satisfy JS709B low halogen requirements of ≤ 1,000 ppm. [2] MSL Rating = Moisture Sensitivity Level Rating as defined by JEDEC standard classifications. [3] Package will withstand ambient temperature range of –40°C to 125°C and storage temperature range of –65°C to 150°C. [4] For the CT450, device marking for the SOIC-8 is defined as CT450 xxZR YYWWLL where the first 2 lines = part number, and third line is YY = year, WW = work week and LL = lot code. Device marking for the TSSOP-8 is defined as CT450 xxZR YYWWLL where the first line = part number, and second line is YY = year, WW = work week and LL = lot code.

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com DEVICE MARKINGS Table 6: CT450 Device Marking Definition for 8-lead SOIC Package Row No. Code Definition 3 • Pin 1 Indicator

1 CT450 Allegro Part Number

2 XX Maximum Field Rating

2 ZR Polarity

3 YY Calendar Year

3 WW Work Week

3 LL Lot Code

Figure 42: CT450 Device Marking for 8-Lead SOIC Package Table 7: CT450 Device Marking Definition for 8-lead TSSOP Package Row No. Code Definition 1 • Pin 1 Indicator

2 CT450 Allegro Part Number

2 XX Maximum Magnetic Field Rating

Figure 43: CT450 Device Marking for 8-Lead TSSOP Package

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems Manchester, NH 03103-3353 U.S.A. www.allegromicro.com PART ORDERING NUMBER LEGEND CT = Part Number Prefix H = –40°C to 125°C

XtremeSense™ TMR Contactless Current Sensor with 1 MHz Bandwidth and Programmable GainCT450 Allegro MicroSystems 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

1 November 2, 2023 Document rebranded and minor editorial updates

2 February 13, 2024 Removed AEC-Q100 (pages 1, 2, 26-28) and updated MSL levels (page 26)

3 March 6, 2024

Updated Offset Voltage (pages 10-17); removed Out Accuracy Performance and Lifetime Drift footnotes (pages 10-17); updated Sensitivity and removed Noise (pages 16-17); and updated branding information (pages 26-27) Copyright 2024, 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.