L6474H

Overview

The L6474H is a bipolar stepper motor driver from the STSPIN L64 series, manufactured by STMicroelectronics. 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 8 V to 45 V, a peak output current of 7.0 A, and an RMS current of 3.0 A. It features programmable power MOS slew rates, low quiescent currents, and comprehensive protections including thermal shutdown and low bus voltage detection.

Feature Summary

• Integrates dual low RDS(on) DMOS full bridge with non-dissipative current sensing
• Supports up to 1/16 microstepping using adaptive decay mode
• Features programmable power MOS slew rate and SPI interface
• Includes two-level overtemperature protection and programmable overcurrent protection

Applications

• Bipolar stepper motor control in industrial automation
• Multi-motor applications requiring daisy-chain configuration
• Evaluation of advanced current control and microstepping performance

Procurement Notes

Verify the specific package variant when ordering, as the L6474 family includes both HTSSOP-28 (e.g., L6474HTR) and PowerSO-36 (e.g., L6474PDTR) packages. Confirm that the required part number matches the intended physical footprint and pinout for your PCB design. Cross-reference official datasheets to ensure compatibility with your system's voltage and current requirements before finalizing procurement.

Selection Notes

Select the L6474H when a compact HTSSOP-28 package is preferred for space-constrained designs. Ensure the application requires a peak current capability of 7.0 A and an RMS current of 3.0 A within the 8 V to 45 V supply range. This component is suitable for systems needing integrated control and power stages with SPI communication, eliminating the need for external logic drivers or complex analog current sensing circuits.

Part Context

The L6474H belongs to the STSPIN L64 series of fully integrated stepper motor controllers. It is designed for demanding applications requiring high reliability and precise motion control. The device combines digital control logic with analog power stages, offering a complete solution for bipolar stepper motors. It is often evaluated using dedicated development boards like the EVAL6474H to explore its full feature set.

Replacement Considerations

The L6474HTR is the tape-and-reel version of the same HTSSOP-28 device. For different packaging needs, consider the L6474PDTR which uses a PowerSO-36 package but shares similar functional characteristics. Verify pin-to-pin compatibility and thermal performance when substituting between package types.