Integrated Fluxgate Magnetic Sensor IC for Closed-Loop Applications


Product details


Features Magnetic Field Sensor Operating temperature range (C) -40 to 125 Vs (Min) (V) 3 Vs (Max) (V) 5.5 Interface type Analog voltage Rating Catalog open-in-new Find other Signal conditioners

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  • High-Precision Integrated Fluxgate Sensor
    • Offset and Drift: ±8 µT max, ±5 nT/°C typ
  • Extended Current Measurement Range
    • H-Bridge Output Drive: ±250 mA typ at 5 V
  • Precision Shunt Sense Amplifier
    • Offset and Drift (max): ±75 µV, ±2 µV/°C
    • Gain Error and Drift (max): ±0.3%, ±5 ppm/°C
  • Precision Reference
    • Accuracy and Drift (max): ±2%, ±50 ppm/°C
    • Pin-Selectable Voltage: 2.5 V or 1.65 V
    • Selectable Ratiometric Mode: VDD/2
  • Magnetic Core Degaussing Feature
  • Diagnostic Features: Overrange and Error Flags
  • Supply Voltage Range: 3.0 V to 5.5 V
  • Fully Specified Over the Extended Industrial Temperature Range of –40°C to +125°C
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The DRV421 is designed for magnetic closed-loop current sensing solutions, enabling isolated, precise dc- and ac-current measurements. This device provides both, a proprietary integrated fluxgate sensor, and the required analog signal conditioning, thus minimizing component count and cost. The low offset and drift of the fluxgate sensor, along with an optimized front-end circuit results in unrivaled measurement precision.

The DRV421 provides all the necessary circuit blocks to drive the current-sensing feedback loop. The sensor front-end circuit is followed by a filter that can be configured to work with a wide range of magnetic cores. The integrated 250-mA H-Bridge drives the compensation coil, while doubling the current measurement range, compared to conventional single-ended drive methods. The device also provides a precision voltage reference and shunt sense amplifier to generate and drive the analog output signal.

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Technical documentation

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Type Title Date
* Data sheet DRV421 Integrated Magnetic Fluxgate Sensor for Closed-Loop Current Sensing datasheet (Rev. B) Mar. 14, 2016
White paper Achieve greater precision, reliability with magnetic sensing technology Jun. 26, 2017
User guide DRV421EVM Users Guide (Rev. A) Aug. 24, 2015
Application note Designing with the DRV421: System Parameter Calculator Aug. 14, 2015
Application note Designing with the DRV421: Control Loop Stability Aug. 05, 2015
Application note Designing with the DRV421: Closed Loop Current Sensor Specifications Jul. 22, 2015
Technical article Six ways to sense current and how to decide which to use Jul. 10, 2015
Technical article Get Connected: A new blog series Jan. 10, 2014

Design & development

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Hardware development

document-generic User guide

The DRV421EVM is an evaluation platform for the DRV421, a complete analog front end IC and coil driver for closed loop current sensing applications.  The DRV421EVM allows the user to explore all the features of the DRV421 device.

  • Integrated fluxgate in a 4x4mm package
  • Internal or external reference capabilities
  • Flexible gain settings for a wide variety of magnetic cores
  • Error and Over Range flag access

Design tools & simulation

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CAD/CAE symbols

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