SBOS988A August   2019  – April 2020 DRV425-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Fluxgate Sensor Front-End
        1. 7.3.1.1 Fluxgate Sensor
        2. 7.3.1.2 Bandwidth
        3. 7.3.1.3 Differential Driver for the Internal Compensation Coil
        4. 7.3.1.4 Magnetic Field Range, Overrange Indicator, and Error Flag
      2. 7.3.2 Shunt-Sense Amplifier
      3. 7.3.3 Voltage Reference
      4. 7.3.4 Low-Power Operation
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Linear Position Sensing
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Current Sensing in Busbars
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Power Supply Decoupling
    2. 9.2 Power-On Start-Up and Brownout
    3. 9.3 Power Dissipation
      1. 9.3.1 Thermal Pad
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.1.1 Fluxgate Sensor

The fluxgate sensor of the DRV425-Q1 is uniquely designed for high-performance magnetic-field sensors because of the high sensitivity, low noise, and low offset of the sensor. The fluxgate principle relies on repeatedly driving the sensor in and out of saturation; therefore, the sensor is free of any significant magnetic hysteresis. The feedback loop accurately drives a compensation current through the integrated compensation coil and drives the magnetic field at the sensor back to zero. This approach supports excellent gain stability and high linearity of the measurement.

The device package is free of any ferromagnetic materials in order to prevent magnetization by external fields and to obtain accurate and hysteresis-free operation. Select materials that cannot be magnetized for the printed circuit board (PCB) and passive components in the direct vicinity of the DRV425-Q1; see the Layout Guidelines section for more details.

The orientation and the sensitivity axis of the fluxgate sensor is indicated by a dashed line on the top of the package, as shown in Figure 61. The figure also shows the location of the sensor inside the package.

DRV425-Q1 drv425-q1-magnetic-sensitivity-direction-of-the-integrated-fluxgate-sensor.gifFigure 61. Magnetic Sensitivity Direction of the Integrated Fluxgate Sensor

The sensitivity of the fluxgate sensor is a vector function of the sensitivity axis and the magnitude of the magnetic field along that axis. Figure 62 shows the output of the DRV425-Q1 versus the angle of the device orientation relative to a constant magnetic field.

DRV425-Q1 D063_SBOS729.gif
Figure 62. Device Output vs Magnetic Field Orientation