Product details

Number of full bridges 2 Vs (Min) (V) 4.5 Vs ABS (Max) (V) 35 Full-scale current (A) 1.5 Peak output current (A) 2.5 RDS(ON) (HS + LS) (mOhms) 900 Sleep current (uA) 2 Control mode STEP/DIR Control interface Hardware (GPIO) Micro-stepping levels 256 Features Current Regulation, Integrated Current Sensing, Smart Tune Rating Catalog Operating temperature range (C) -40 to 125
Number of full bridges 2 Vs (Min) (V) 4.5 Vs ABS (Max) (V) 35 Full-scale current (A) 1.5 Peak output current (A) 2.5 RDS(ON) (HS + LS) (mOhms) 900 Sleep current (uA) 2 Control mode STEP/DIR Control interface Hardware (GPIO) Micro-stepping levels 256 Features Current Regulation, Integrated Current Sensing, Smart Tune Rating Catalog Operating temperature range (C) -40 to 125
HTSSOP (PWP) 28 43 mm² 9.7 x 4.4 VQFN (RGE) 24 16 mm² 4 x 4
  • PWM microstepping stepper motor driver
    • Simple STEP/DIR interface
    • Up to 1/256 microstepping indexer
  • Integrated current sense functionality
    • No sense resistors required
    • ±5% full-scale current accuracy
  • Smart tune decay technology, fixed slow, and mixed decay options
  • 4.5 to 33-V Operating supply voltage range
  • Low RDS(ON):
    • 900 mΩ HS + LS at 24 V, 25°C
  • High current capacity per bridge
    • 2.5 A peak, 1.5 A full-scale, 1.1 A rms
  • Pin to pin compatible with -
  • Configurable off-time PWM chopping
    • 7-µs, 16-µs, 24-µs, or 32-µs.
  • Supports 1.8-V, 3.3-V, 5.0-V logic inputs
  • Low-current sleep mode (2 µA)
  • Spread spectrum clocking for low electromagnetic interference (EMI)
  • Small package and footprint
  • Protection features
    • VM undervoltage lockout (UVLO)
    • Charge pump undervoltage (CPUV)
    • Overcurrent protection (OCP)
    • Thermal shutdown (OTSD)
    • Fault condition output (nFAULT)
  • PWM microstepping stepper motor driver
    • Simple STEP/DIR interface
    • Up to 1/256 microstepping indexer
  • Integrated current sense functionality
    • No sense resistors required
    • ±5% full-scale current accuracy
  • Smart tune decay technology, fixed slow, and mixed decay options
  • 4.5 to 33-V Operating supply voltage range
  • Low RDS(ON):
    • 900 mΩ HS + LS at 24 V, 25°C
  • High current capacity per bridge
    • 2.5 A peak, 1.5 A full-scale, 1.1 A rms
  • Pin to pin compatible with -
  • Configurable off-time PWM chopping
    • 7-µs, 16-µs, 24-µs, or 32-µs.
  • Supports 1.8-V, 3.3-V, 5.0-V logic inputs
  • Low-current sleep mode (2 µA)
  • Spread spectrum clocking for low electromagnetic interference (EMI)
  • Small package and footprint
  • Protection features
    • VM undervoltage lockout (UVLO)
    • Charge pump undervoltage (CPUV)
    • Overcurrent protection (OCP)
    • Thermal shutdown (OTSD)
    • Fault condition output (nFAULT)

The DRV8426 is a stepper motor driver for industrial and consumer applications. The device is fully integrated with two N-channel power MOSFET H-bridge drivers, a microstepping indexer, and integrated current sensing. The DRV8426 is capable of driving up to 1.5-A full-scale output current (dependent on PCB design).

The DRV8426 uses an internal current sense architecture to eliminate the need for two external power sense resistors, saving PCB area and system cost. The device uses an internal PWM current regulation scheme selectable between smart tune, slow and mixed decay options. Smart tune automatically adjusts for optimal current regulation, compensates for motor variation and aging effects and reduces audible noise from the motor.

A simple STEP/DIR interface allows an external controller to manage the direction and step rate of the stepper motor. The device can be configured in full-step to 1/256 microstepping. A low-power sleep mode is provided using a dedicated nSLEEP pin. Protection features are provided for supply undervoltage, charge pump faults, overcurrent, short circuits, and overtemperature. Fault conditions are indicated by the nFAULT pin.

The DRV8426 is a stepper motor driver for industrial and consumer applications. The device is fully integrated with two N-channel power MOSFET H-bridge drivers, a microstepping indexer, and integrated current sensing. The DRV8426 is capable of driving up to 1.5-A full-scale output current (dependent on PCB design).

The DRV8426 uses an internal current sense architecture to eliminate the need for two external power sense resistors, saving PCB area and system cost. The device uses an internal PWM current regulation scheme selectable between smart tune, slow and mixed decay options. Smart tune automatically adjusts for optimal current regulation, compensates for motor variation and aging effects and reduces audible noise from the motor.

A simple STEP/DIR interface allows an external controller to manage the direction and step rate of the stepper motor. The device can be configured in full-step to 1/256 microstepping. A low-power sleep mode is provided using a dedicated nSLEEP pin. Protection features are provided for supply undervoltage, charge pump faults, overcurrent, short circuits, and overtemperature. Fault conditions are indicated by the nFAULT pin.

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Technical documentation

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Type Title Date
* Data sheet DRV8426 Stepper Driver With Integrated Current Sense, 1/256 Microstepping, STEP/DIR Interface and smart tune Technology datasheet (Rev. B) 20 Apr 2021
Application note How to Improve Motion Smoothness and Accuracy of Stepper Motors (Rev. A) 11 Oct 2021
Application note Methods to Configure Current Regulation for Brushed and Stepper Motors (Rev. B) 19 Jan 2021
Technical article 4 key questions about motor design challenges 30 Nov 2020
Application note Smart Tune for Quiet and Smooth Stepper Motor Operation (Rev. A) 01 Nov 2020
White paper Stepper Motors Made Easy with Smart Tune (Rev. C) 01 Nov 2020
Application note Advantages of Integrated Current Sensing (Rev. A) 09 Oct 2020
Technical article Drive unipolar stepper motors as bipolar stepper motors with a simple wiring reconfiguration 09 Apr 2020
Technical article How stepper motors improve noise and efficiency in automotive system design 19 Nov 2019
Application note Open Load Detection in Intergrated Drivers (Rev. A) 07 Nov 2019
White paper How smart tune regulates current in stepper motors (Rev. A) 19 Mar 2019
Application note Smart Tuning for Efficient Stepper Driving 20 Nov 2018
Technical article Getting smart about tuning your stepper motor 23 Aug 2018
Application note PowerPAD™ Thermally Enhanced Package (Rev. H) 06 Jul 2018
Application note PowerPAD™ Made Easy (Rev. B) 12 May 2004

Design & development

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Evaluation board

DRV8426EVM — DRV8426 STEP/DIR control interface stepper motor driver board

The DRV8426 evaluation module (EVM) allows easy evaluation of the DRV8426 device.

The DRV8426 devices are integrated motor-driver solutions for bipolar stepper motors. The device integrates two N-channel power MOSFET H-bridges, integrated current sense and regulation circuitry, and a microstepping (...)

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HTSSOP (PWP) 28 View options
VQFN (RGE) 24 View options

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