Texas Instruments DRV8805DWR

Overview

DRV8805DWR from Texas Instruments is a quad-channel protected low-side stepper motor driver IC for unipolar stepper motors, integrating indexer logic, overcurrent protection, thermal shutdown, and clamp diodes. It operates from 8.2 V to 60 V, delivers up to 1.5 A per channel (SOIC package, single-channel active), supports full/half/wave step modes via STEP/DIR interface, and targets precision motion control in gaming machines and industrial positioning systems.

For engineers reviewing the DRV8805DWR datasheet, DRV8805DWR pinout, DRV8805DWR application, or DRV8805DWR equivalent, key selection criteria include its 4-channel low-side NMOS architecture with 500 mΩ R_DS(on), integrated fault reporting via nFAULT, step-mode configuration via SM0/SM1, and SOIC-20 thermally enhanced package requiring PCB heatsinking for sustained 800 mA four-channel operation.

Technical Context

The DRV8805DWR implements a dedicated unipolar stepper indexer with three programmable excitation modes (2-phase full-step, 1–2-phase half-step, 1-phase wave drive) controlled by SM0/SM1 inputs. Its four low-side N-channel MOSFETs feature internal current limiting (2.3–3.8 A trip level) with 3.5 µs deglitch and 1.2 ms auto-retry, plus integrated clamp diodes referenced to VCLAMP for inductive flyback suppression.

Protection is comprehensive: undervoltage lockout triggers at 8.2 V on VM, thermal shutdown activates at ~150 °C, and all faults assert open-drain nFAULT low. The device uses internal regulation from VM to power gate drivers and logic, and includes internal pulldowns on DIR, nENBL, RESET, SM0, and SM1 for robust default-state behavior.

Key Specifications

Pinout & Package

DRV8805DWR is housed in a 20-pin wide SOIC (DW) package measuring 12.80 mm × 7.50 mm, with exposed center thermal pad fused to GND pins (5, 6, 7, 14, 15, 16) for enhanced heat dissipation. The package is RoHS-compliant and requires PCB copper area + thermal vias for reliable 800 mA four-channel operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar unipolar stepper motor driver applications.

Compared with TB6560AHQ and LV8711T, the DRV8805DWR uniquely combines unipolar indexing, integrated clamp diodes, and SOIC-20 thermal design-making it the only drop-in solution for cost-sensitive, space-constrained unipolar stepper applications requiring full/half/wave drive without external logic.

Availability

DRV8805DWR is available at Aetrix Electronics and suitable for gaming machine actuators, industrial linear positioners, medical diagnostic instrumentation, and automated retail kiosks requiring stable component supply across multi-year production cycles.

Supply support for DRV8805DWR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with over 90 years of innovation in power management, signal chain, and motor control ICs.

The DRV8805DWR belongs to TI's high-voltage stepper driver product line, engineered specifically for unipolar motor control in cost-sensitive, thermally constrained applications where integration of indexer, protection, and low-side drive reduces system complexity and improves reliability.

FAQ

What is the maximum continuous output current per channel for DRV8805DWR at 25°C?

The DRV8805DWR supports up to 1.5 A per channel when only one output is active, and 800 mA per channel when all four outputs are simultaneously active at 25°C ambient temperature. This rating assumes use of the SOIC-20 (DW) package with adequate PCB copper area and thermal vias for heatsinking, as specified in the thermal design guidelines.

How does the VCLAMP pin function in DRV8805DWR, and what are the recommended connections?

The VCLAMP pin in DRV8805DWR provides the reference node for the integrated clamp diodes connected to each OUTx pin. It must be connected either directly to VM (motor supply) for basic operation or to a Zener/TVS diode tied to VM to allow controlled voltage clamping above VM-enabling faster current decay in high-inductance windings. Floating VCLAMP is not permitted.

Does DRV8805DWR support microstepping, and what step modes are available?

No, DRV8805DWR does not support microstepping. It provides three fixed-resolution unipolar stepping modes: 2-phase full-step (1.8°/step), 1–2-phase half-step (0.9°/step), and 1-phase wave drive (1.8°/step), selected via binary encoding on SM0 and SM1 pins. These modes are implemented in hardware and require no external clock or firmware sequencing.

What protection features are integrated into DRV8805DWR, and how are faults reported?

DRV8805DWR integrates overcurrent protection (per channel, 2.3–3.8 A trip), thermal shutdown (~150 °C), and undervoltage lockout (8.2 V). All faults assert the open-drain nFAULT pin low. Faults are automatically cleared after 1.2 ms retry time unless RESET is asserted or VM is cycled. nFAULT requires an external pullup resistor for system-level monitoring.

Can DRV8805DWR drive bipolar stepper motors?

No, DRV8805DWR is designed exclusively for unipolar stepper motors with four independent windings. It lacks H-bridge topology and complementary high-side drivers required for bipolar operation. Attempting to drive a bipolar motor will result in incomplete excitation and potential damage due to improper current paths and missing recirculation paths.