L6474PDTR

Overview

The L6474PDTR is a bipolar stepper motor driver from STMicroelectronics, part of the L6474 series. It integrates a dual low RDS(on) DMOS full bridge with accurate on-chip current sensing for non-dissipative control and overcurrent protection. The device supports up to 1/16 microstepping via an adaptive decay mode and communicates through a standard SPI interface. Key electrical parameters include an operating voltage range of 8V to 45V, a peak output current of 7.0A, and an RMS current of 3.0A. It features programmable power MOS slew rates and operates within a junction temperature range of -40°C to 150°C.

Feature Summary

• Integrates dual low RDS(on) DMOS full bridge with on-chip current sensing for non-dissipative control
• Supports up to 1/16 microstepping using adaptive decay mode for improved performance
• Features comprehensive protections including thermal, low bus voltage, and programmable overcurrent
• Communicates via standard SPI interface for register configuration and status monitoring

Applications

• Industrial automation systems requiring precise motion control
• Robotics applications utilizing bipolar stepper motors
• General-purpose motor control designs needing integrated drive and control

Procurement Notes

Verify the specific package variant, as L6474PDTR denotes the PowerSO-36 tape and reel configuration. Confirm compatibility with your system's SPI voltage levels and ensure adequate thermal management for the PowerSO-36 package given the high current capabilities. Check for RoHS compliance and SVHC status in the latest datasheet before finalizing procurement.

Selection Notes

Select this component when a fully integrated solution combining control logic and power stage is required for bipolar stepper motors. It is suitable for applications demanding high precision through microstepping and robust protection features. Consider the PowerSO-36 package constraints regarding thermal dissipation and PCB space compared to other variants like HTSSOP28.

Part Context

This part belongs to the STSPIN L64 series of motor drivers designed for industrial and general-purpose applications. It represents a highly integrated approach by combining analog mixed-signal technology with power DMOS switches. The L6474 family is positioned to simplify motor control design by reducing external component count while offering advanced current control algorithms.

Replacement Considerations

Direct pin-to-pin replacements may be limited due to specific package differences. Evaluate other L6474 variants such as L6474HTR (HTSSOP-28) if package size is a constraint, noting that pinout and thermal characteristics differ. Ensure any substitute maintains SPI compatibility and similar current handling capabilities.