L297D

Overview

The L297D is a stepper motor controller IC designed for microcomputer-controlled applications. It generates four phase drive signals for two-phase bipolar and four-phase unipolar step motors. The device supports half-step, normal, and wave drive modes. It features an on-chip PWM chopper circuit for switch-mode current regulation in windings. Input requirements are limited to clock, direction, and mode signals. It operates with a supply voltage range of 4.75V to 7V. The junction temperature range is -40°C to 150°C. It is housed in a 20-SOIC package.

Feature Summary

• Generates internal phase drive signals to reduce microprocessor burden
• Includes on-chip PWM chopper circuits for load current regulation
• Supports multiple drive modes including half-step, normal, and wave

Applications

• Microcomputer-controlled stepper motor systems
• Bipolar and unipolar step motor drive interfaces
• General purpose motion control applications

Procurement Notes

Verify the specific suffix against official STMicroelectronics documentation to confirm package type and tape/reel specifications. Ensure compatibility with external bridge drivers such as the L298N or L293E if discrete transistors are not used. Confirm RoHS compliance status through the manufacturer's latest datasheet before finalizing procurement.

Selection Notes

Select this component when a dedicated stepper controller is required to offload sequencing tasks from the main processor. It is suitable for designs utilizing external power stages like monolithic bridge drivers. Consider the 20-SOIC package constraints for PCB layout. Verify that the application voltage remains within the specified 4.75V to 7V range for proper operation.

Part Context

The L297D belongs to the L297 series of stepper motor controllers manufactured by STMicroelectronics. This series is engineered to simplify the interface between microcomputers and stepper motors. The D suffix typically denotes the SOIC package variant within this product line, distinguishing it from DIP versions.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.