L9958SB

Overview

The L9958SBTR is a fully integrated bipolar motor driver manufactured by STMicroelectronics, designed for driving DC and stepper motors in safety-critical applications. It operates with a supply voltage range of 4.5V to 5.5V and supports load voltages from 4V to 28V. The device delivers an output current of up to 8.6A and features a dual half-bridge configuration. Communication is handled via an SPI interface using CMOS technology. It is housed in a 16-PowerBSOP (PowerSO-16) surface-mount package and functions within a junction temperature range of -40°C to 150°C.

Feature Summary

• Fully integrated control and power stage for bipolar DC and stepper motors
• SPI-based programmable current regulation with four distinct threshold levels
• Comprehensive diagnostic capabilities including short circuit, overload, over-temperature, and open-load detection

Applications

• Safety-critical automotive systems
• Brushed DC motor control
• Bipolar stepper motor actuation
• Evaluation of high-current motor drive functionalities

Procurement Notes

Verify the specific suffix against official datasheets to confirm pinout and electrical characteristics, as variations may exist between TR, CT, and Digi-Reel packaging options. Confirm that the component status is active for new designs, noting that related variants like the L9958TR have been marked as not recommended for new use. Ensure compatibility with 3.3V or 5V control logic levels when integrating with host microcontrollers.

Selection Notes

Select this component for applications requiring high current delivery up to 8.6A with integrated protection mechanisms. The SPI interface allows for precise current threshold setting and real-time diagnostic monitoring. Consider the PowerSO-16 package constraints for thermal management, although the device is designed to operate without external heatsinks under typical conditions. Ensure the host system supports the required SPI protocol and voltage levels.

Part Context

The L9958 series serves as a robust solution for motor control in extreme environmental conditions. It is often evaluated using the EVAL-L9958 board, which provides necessary inputs and outputs for testing. The device complements other STMicroelectronics motor drivers by offering a complete integrated solution for bipolar motors, distinguishing itself through its specific current regulation and diagnostic features accessible via software.

Replacement Considerations

Public documentation indicates that the L9958TR variant is marked as 'Not Recommended for New Designs' (NRND). Engineers should verify if the L9958SBTR is the designated successor or alternative for new projects. Cross-reference with other STMicroelectronics motor driver families such as the STSPIN series for potential future-proofing, ensuring interface and current requirements align.