DRV425-Q1 Automotive fully-integrated fluxgate magnetic sensor for open-loop applications | TI.com

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Automotive fully-integrated fluxgate magnetic sensor for open-loop applications



The DRV425-Q1 automotive device is designed for single-axis magnetic field-sensing applications, and enables electrically-isolated, high-sensitivity, and precise dc- and ac-field measurements. The device provides the unique and proprietary, integrated fluxgate sensor (IFG) with an internal compensation coil to support a high-accuracy sensing range of ±2 mT, with a measurement bandwidth of up to 47 kHz. The low offset, offset drift, and noise of the sensor, combined with the precise gain, low gain drift, and very low nonlinearity provided by the internal compensation coil, result in unrivaled magnetic field measurement precision.This high level of sensitivity and accuracy enables more current measurements in high-current busbar applications, such as traction inverters or battery-management systems. Torque sensor or motor diagnostic systems can benefit from the ability to precisely measure the position or displacement of a magnetic field. The output of the DRV425-Q1 is an analog signal proportional to the sensed magnetic field.

The device offers a complete set of features, including an internal difference amplifier, on-chip precision reference, and diagnostic functions to minimize component count and system-level cost.

The device is available in a thermally-enhanced, nonmagnetic, thin WQFN package, with a thermal pad for optimized heat dissipation, and is specified for operation over the automotive temperature range of –40°C to +125°C.


  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • High-precision, integrated fluxgate sensor:
    • Offset: ±8 µT (max)
    • Offset drift: ±5 nT/°C (typ)
    • Gain error: 0.04% (typ)
    • Gain drift: ±7 ppm/°C (typ)
    • Linearity: ±0.1%
    • Noise: 1.5 nT/√Hz (typ)
  • Sensor range: ±2 mT (max)
    • Range and gain adjustable with external resistor
  • Selectable bandwidth: 47 kHz or 32 kHz
  • Precision reference:
    • Accuracy: 2% (max), drift: 50 ppm/°C (max)
    • Pin-selectable voltage: 2.5 V or 1.65 V
    • Selectable ratiometric mode: VDD / 2
  • Diagnostic features: Overrange and error flags
  • Supply voltage range: 3.0 V to 5.5 V

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Part number Order Features Operating temperature range (C) Vs (Min) (V) Package Group Vs (Max) (V) Package size: mm2:W x L (PKG) Rating
DRV425-Q1 Order now Magnetic Field Sensor     -40 to 125     3     QFN | 20     5.5     20QFN: 16 mm2: 4 x 4 (QFN | 20)     Automotive    
DRV401-Q1 Order now AFE for Magnetic Current Sensing     -40 to 125     4.5     VQFN | 20     5.5     20VQFN: 25 mm2: 5 x 5 (VQFN | 20)     Automotive