DRV8805 Unipolar Stepper Motor Driver Integrated Circuit 1

Feature

• 4-channel protection low-side driver

– Four NMOS FETs with overcurrent protection

–Integrated Inductor Clamping Diode

• Indexer/Converter for Unipolar Stepping Motors

– Simple step/direction interface

Three-step mode (2-phase full stepping, 1-2 phase half stepping, 1-phase wave driving)  diode

•DW Packaging: 1.5-A (single channel enabled)/800 mA (four channels enabled) Maximum drive current per channel (at 25°C)

•PWP Encapsulation: 2-A (Single Channel Enabled) / 1-A (Quad Channel Enabled) Maximum Drive Current per Channel (25°C, Adequate PCB Heat Dissipation)   diode

•Operating voltage range of 8.2 V to 60 V

• Thermally enhanced surface-mounted components

Application

• Game console

• Universal Unipolar Stepper Motor Driver

Explanation

The DRV8805 provides an integrated solution for driving unipolar stepper motors. It includes four low-side drivers with overcurrent protection and built-in diodes to clamp the back-EMF transients generated by the motor windings.

The indexer logic controls a unipolar stepper motor with a simple step/direction interface also integrated. It supports three stepping modes: 2-phase (full-step), 1-2-phase (half-step), and 1-phase (wave drive).

In the SOIC (DW) package, the DRV8805 can provide a continuous output current of up to 1.5 A (one channel enabled) or 800 mA (all channels enabled) at 25°C. In the HTSSOP (PWP) package, it can deliver a continuous output current of up to 2 A (one channel enabled) or 1 A (all four channels enabled) at 25°C, provided the PCB has adequate heat dissipation.

It provides overcurrent protection, short-circuit protection, undervoltage lockout, and internal shutdown for overheating, with faults indicated by the fault output pin.   diode

The DRV8805 is available in a 20-pin thermally enhanced SOIC package and a 16-pin HTSSOP package (RoHS compliant and free of Sb/Br).