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

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Parametrics Compare all products in Fluxgate Sensors

 
Architecture
Current Sensor Type
Vs (Min) (V)
Vs (Max) (V)
System Bandwidth (KHz)
Offset Voltage (+/-) (uV)
Offset Drift (Max) (uV/C)
Gain Error (+/-) (Max) (%)
Gain Drift (Typ) (ppm/C)
Reference Voltage (V)
Reference Accuracy (+/-) (Max) (%)
Reference Drift (Max) ((±) ppm/°C)
Rating
Operating Temperature Range (C)
Package Group
Pin/Package
Package Size: mm2:W x L (PKG)
DRV421 DRV401 DRV401-EP DRV401-Q1 DRV411 DRV425
Closed Loop    Closed Loop    Closed Loop    Closed Loop    Closed Loop    Open Loop   
Fluxgate Integrated    Fluxgate External    Fluxgate External    Fluxgate External    Hall-effect External    Fluxgate Integrated   
3    4.5    4.5    4.5    2.7    3   
5.5    5.5    5.5    5.5    5.5    5.5   
2000    2000    2000    2000    2000    47   
75    100    100    100    100    75   
2    1      1    2    2   
0.3    0.3    0.3    0.3    0.3    0.3   
1    0.1    0.1    0.1    1    1   
1.65 / 2.5 / Ratiometric    2.5    2.5    2.5    1.65 / 2.5 / Ratiometric    1.65 / 2.5 / Ratiometric   
2    0.2    0.2    0.2    0.2    2   
100    50      50    50    50   
Catalog    Catalog    HiRel Enhanced Product    Automotive    Catalog    Catalog   
-40 to 125    -40 to 125    -55 to 125    -40 to 125    -40 to 125    -40 to 125   
QFN    SO PowerPAD
VQFN   
SO PowerPAD    VQFN    HTSSOP
QFN   
QFN   
20QFN    20SO PowerPAD
20VQFN   
20SO PowerPAD    20VQFN    20HTSSOP
20QFN   
20QFN   
20QFN: 16 mm2: 4 x 4(QFN)    20SO PowerPAD: 133 mm2: 10.405 x 12.825(SO PowerPAD)
20VQFN: 25 mm2: 5 x 5(VQFN)   
20SO PowerPAD: 133 mm2: 10.405 x 12.825(SO PowerPAD)    20VQFN: 25 mm2: 5 x 5(VQFN)    20HTSSOP: 42 mm2: 6.4 x 6.5(HTSSOP)
20QFN: 16 mm2: 4 x 4(QFN)   
20QFN: 16 mm2: 4 x 4(QFN)