DRV425

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Fully-integrated fluxgate magnetic sensor for open-loop applications

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Product details

Parameters

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

Package | Pins | Size

WQFN (RTJ) 20 open-in-new Find other Signal conditioners

Features

  • 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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Description

The DRV425 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. The output of the DRV425 is an analog signal proportional to the sensed magnetic field.

The DRV425 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 DRV425 is available in a thermally-enhanced, non-magnetic, thin WQFN package with a PowerPAD™ for optimized heat dissipation, and is specified for operation over the extended industrial temperature range of –40°C to +125°C.

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Technical documentation

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Type Title Date
* Datasheet DRV425 Fluxgate Magnetic-Field Sensor datasheet (Rev. A) Mar. 10, 2016
E-book Simplifying Current Sensing (Rev. A) Jan. 09, 2020
Technical article Addressing high-voltage current-sensing design challenges in HEV/EVs Nov. 04, 2019
Technical article Current sensing in battery management systems May 30, 2019
Application note Fluxgate for Motor Diagnostics Dec. 21, 2017
White paper Achieve greater precision, reliability with magnetic sensing technology Jun. 26, 2017
Application note Design Considerations for Dual DRV425 Bus Bar Application Mar. 30, 2017
Application note Bus Bar Theory of Operation Nov. 08, 2016
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

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
99
Description
The DRV425-BUSBAR-EVM is a complete bus bar assembly that is a non-invasive (isolated) current measurement solution up to ±100A.  This assembly includes bus bar with a circular cutout, insert, PCB, isolated standoffs, terminal blocks, and interface cable assembly to enable high current (...)
Features
  • Current range up to 100A
  • Non-Invasive (Isolated) measurement
  • Complete assembly
  • Open-loop current sensor
  • Accurately measure AC and DC currents
EVALUATION BOARD Download
document-generic User guide
20
Description

The DRV425EVM is an evaluation platform for the DRV425, a complete analog front end IC and coil driver for open loop magnetic field sensing applications. The DRV425EVM allows the user to explore all the features of the DRV425 device.

Features
  • Integrated fluxgate in a 4x4mm package
  • Internal or external reference capabilities
  • Flexible filter bandwidth settings
  • Error and Over Range flag access
  • Enables overall sensor accuracy <0.1%, best in its class

Design tools & simulation

SIMULATION TOOL Download
SBOC481.ZIP (591 KB)
CALCULATION TOOL Download
SBOC480.ZIP (226 KB)
CALCULATION TOOL Download
SLOC331.ZIP (481 KB)

Reference designs

REFERENCE DESIGNS Download
±100-A Bus Bar Current Sensor using Open-Loop Fluxgate Sensors Reference Design
TIPD205 This single-supply open loop current sensing solution to accurately measure dc, ac and pulsed currents. Allows highly accurate current measurements up to 110 A
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
QFN (RTJ) 20 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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