L6474PD

Overview

The L6474PD is a bipolar stepper motor driver IC from STMicroelectronics, housed in a 36-pin PowerSO package. It operates within an 8 V to 45 V supply range and delivers up to 7.0 A peak output current with 3.0 A RMS capability. The device integrates dual low RDS(on) DMOS full bridges with accurate on-chip non-dissipative current sensing. It supports SPI interface communication at speeds up to 5 Mbit/s and enables microstepping resolution from 1 to 1/16 using adaptive decay mode. The component functions reliably across a junction temperature range of -40°C to 150°C.

Feature Summary

• Integrates dual low RDS(on) DMOS full bridges with non-dissipative current sensing for precise control
• Supports up to 1/16 microstepping via adaptive decay mode for smooth motion
• Features comprehensive protection including programmable overcurrent and two-level overtemperature safeguards

Applications

• Bipolar stepper motor control systems
• Industrial automation equipment
• Medical devices requiring precise positioning

Procurement Notes

Verify the specific suffix against official datasheets to confirm package type and tape/reel specifications. Ensure compatibility with system voltage requirements between 8 V and 45 V. Confirm thermal management solutions are adequate for the intended operating environment given the PowerSO-36 package constraints.

Selection Notes

Select this component for applications requiring integrated control and power stages with high precision. The SPI interface allows for flexible configuration of current limits and microstepping. Consider the 36-pin PowerSO package for surface mount assembly needs. Evaluate thermal performance based on the 3.0 A RMS continuous current rating.

Part Context

The L6474PD belongs to the L6474 series of advanced stepper motor drivers. This series is designed for demanding motor control applications, offering high integration levels. The PD variant specifically denotes the PowerSO-36 package configuration, distinguishing it from other pinout options like the HTSSOP28 variant.

Replacement Considerations

The L6474HTR serves as a functional alternative within the same family, utilizing an HTSSOP28 package instead of PowerSO-36. Verify pin-to-pin compatibility and package dimensions before substitution.