DRV8849RHHR

Overview

The DRV8849RHHR is a dual stepper motor driver from Texas Instruments, designed for industrial and consumer applications. It features an integrated microstepping indexer supporting up to 1/256 microstepping via a STEP/DIR interface. The device operates on a supply voltage range of 4.5 V to 38 V and delivers a full-scale output current of 1.5 A per H-bridge. Key technical specifications include a low on-resistance of 900 mΩ (HS + LS) at 24 V and 25°C. It incorporates integrated current sensing with ±5% full-scale accuracy, eliminating the need for external sense resistors. The component supports logic inputs of 1.8 V, 3.3 V, and 5.0 V and includes protection features such as UVLO, OCP, and thermal shutdown.

Feature Summary

• Integrated microstepping indexer supporting resolutions up to 1/256
• Internal current sensing architecture removes requirement for external power sense resistors
• Smart Tune decay technology for configurable PWM chopping off-times
• Comprehensive protection suite including overcurrent protection and thermal shutdown

Applications

• IP Network Cameras
• Printers and scanners
• ATM and money handling machines
• Sewing machines
• Medical Imaging equipment
• 3D Printers

Procurement Notes

Verify the specific suffix RHHR against the manufacturer datasheet to confirm package type and tape/reel specifications. Ensure input logic levels match system requirements, as the device supports 1.8-V, 3.3-V, and 5.0-V interfaces. Confirm that the PCB design can handle the thermal dissipation associated with the 1.5-A full-scale current rating. Check for any regional compliance certifications required for the target market.

Selection Notes

Select this component when a compact solution for dual stepper motors is required without external current sensing resistors. It is suitable for applications needing high microstepping resolution up to 1/256. Consider the 38-V maximum supply voltage and 1.5-A current limit relative to motor coil resistance. Evaluate the Smart Tune decay feature if precise current regulation is critical for noise reduction and torque performance.

Part Context

The DRV8849RHHR belongs to the DRV8849 family of dual stepper drivers by Texas Instruments. This series is engineered to simplify motion control designs by integrating the indexer and current sense circuitry directly onto the chip. The RHHR designation typically indicates a specific QFN package variant optimized for surface-mount assembly in space-constrained electronic devices.

Replacement Considerations

Consult official substitution guides for electrically compatible alternatives within the same product family or broader driver categories. Verify pin-to-pin compatibility and parameter alignment before replacing.