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Product details

Parameters

Number of full bridges 2 Vs (Min) (V) 4.5 Vs (Max) (V) 33 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 open-in-new Find other Stepper motor drivers

Package | Pins | Size

HTSSOP (PWP) 28 43 mm² 9.7 x 4.4 HTSSOP (PWP) 28 VQFN (RGE) 24 16 mm² 4 x 4 open-in-new Find other Stepper motor drivers

Features

  • 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)

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Description

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, fast, 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

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet DRV8426 Stepper Driver With Integrated Current Sense, 1/256 Microstepping, STEP/DIR Interface and smart tune Technology datasheet (Rev. A) Oct. 20, 2020
Technical articles 4 key questions about motor design challenges Nov. 30, 2020
Application note Advantages of Integrated Current Sensing (Rev. A) Oct. 09, 2020
Application note Smart Tune for Quiet and Smooth Stepper Motor Operation (Rev. A) Oct. 07, 2020
White paper Stepper Motors Made Easy with Smart Tune (Rev. C) Oct. 07, 2020
Application note How to Improve Motion Smoothness and Accuracy of Stepper Motors Sep. 18, 2020
Technical articles Drive unipolar stepper motors as bipolar stepper motors with a simple wiring reconfiguration Apr. 09, 2020
Application note Various Reference Voltage Driving Techniques for Motor Drive Current Regulation (Rev. A) Jan. 27, 2020
Technical articles How stepper motors improve noise and efficiency in automotive system design Nov. 19, 2019
Application note Open Load Detection in Intergrated Drivers (Rev. A) Nov. 07, 2019
White paper How smart tune regulates current in stepper motors (Rev. A) Mar. 19, 2019
Application note Smart Tuning for Efficient Stepper Driving Nov. 20, 2018
Technical articles Getting smart about tuning your stepper motor Aug. 23, 2018
Application note PowerPAD™ Thermally Enhanced Package (Rev. H) Jul. 06, 2018
Application note PowerPAD™ Made Easy (Rev. B) May 12, 2004

Design & development

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

Hardware development

EVALUATION BOARD Download
75
Description

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 (...)

Features
  • 4.5-V to 33-V operating voltage range
  • Up to 2.5-A peak current
  • A simple STEP/DIR input interface
  • Integrated current sense and microstepping indexer
  • Smart tune technology

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 28 View options
VQFN (RGE) 24 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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