DRV421 Integrated Fluxgate Magnetic Sensor IC for Closed-Loop Applications | TI.com

DRV421 (ACTIVE) Integrated Fluxgate Magnetic Sensor IC for Closed-Loop Applications

 

Description

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.

Features

  • 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

Parametrics

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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
DRV421 Order now Magnetic Field Sensor     -40 to 125     3     QFN | 20     5.5     20QFN: 16 mm2: 4 x 4 (QFN | 20)     Catalog    
DRV401 Order now AFE for Magnetic Current Sensing     -40 to 125     4.5     SO PowerPAD | 20
VQFN | 20    
5.5     20SO PowerPAD: 133 mm2: 10.405000000000001 x 12.825 (SO PowerPAD | 20)
20VQFN: 25 mm2: 5 x 5 (VQFN | 20)    
Catalog    
DRV401-EP Samples not available AFE for Magnetic Current Sensing     -55 to 125     4.5     SO PowerPAD | 20     5.5     20SO PowerPAD: 133 mm2: 10.405000000000001 x 12.825 (SO PowerPAD | 20)     HiRel Enhanced Product    
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    
DRV411 Order now AFE for Magnetic Current Sensing     -40 to 125     2.7     HTSSOP | 20
QFN | 20    
5.5     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)
20QFN: 16 mm2: 4 x 4 (QFN | 20)    
Catalog    
DRV425 Order now Magnetic Field Sensor     -40 to 125     3     QFN | 20     5.5     20QFN: 16 mm2: 4 x 4 (QFN | 20)     Catalog