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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. ADVANCE INFORMATION for pre-production products; subject to

change without notice.

DRV8426

SLOSE55 – MAY 2020

DRV8426 Stepper Driver With Integrated Current Sense, 1/256 Microstepping, STEP/DIR

Interface and smart tune Technology

1

1 Features

1

•

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

•

–

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

•

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)

2 Applications

•

Printers and Scanners

•

3D Printers

•

ATM and Money Handling Machines

•

Textile and Sewing Machines

•

Stage Lighting Equipment

•

CCTV, Security and Dome Cameras

•

Office and Home Automation

•

Factory Automation and Robotics

3 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 DRV8426 uses an internal PWM current

regulation scheme selectable between smart tune,

fast, slow and mixed decay options. Smart tune

decay technology automatically adjusts for optimal

current regulation performance, 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

different step modes ranging from full-step to 1/256

microstepping. A low-power sleep mode is provided

for very low standby quiescent standby current 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.

Table 1. Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

DRV8426PWPR

HTSSOP (28)

9.7mm x 4.4mm

DRV8426RGER

VQFN (24)

4.0mm x 4.0mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Figure 1. Simplified Schematic