L6228DTR

Overview

The L6228DTR is a fully integrated bipolar stepper motor driver manufactured by STMicroelectronics. It utilizes DMOS technology in a BCD process to combine isolated power transistors with CMOS and bipolar control circuits on a single chip. The device operates within an 8V to 52V supply range, delivering a peak output current of 2.8A (1.4A RMS) with a typical RDS(ON) of 0.73Ω at 25°C. It supports switching frequencies up to 100kHz and features non-dissipative overcurrent protection, thermal shutdown, and undervoltage lockout. Packaged in a 24-SO surface-mount format, it integrates dual full bridges, PWM current controllers, and phase sequence logic for direct drive applications.

Feature Summary

• Integrates dual DMOS full bridges with constant off-time PWM current controllers for precise chopping regulation
• Includes decoding logic for full and half-step drive sequences without external microcontroller intervention
• Features fast/slow decay mode selection and quasi-synchronous rectification for optimized motor performance
• Provides comprehensive protection including non-dissipative overcurrent detection, cross-conduction prevention, and thermal shutdown

Applications

• Industrial automation systems requiring bipolar stepper motor control
• General-purpose motion control applications
• Integrated actuator drives utilizing full or half-step sequencing

Procurement Notes

Verify the specific package variant against project requirements, as the L6228 family includes PowerSO36 and SO24 options. Confirm that the 24-SO package aligns with PCB footprint constraints. Ensure operating conditions remain within the specified voltage and temperature limits to maintain reliability. Cross-reference datasheet revisions for any pinout or electrical characteristic updates prior to final design approval.

Selection Notes

Select this component when a fully integrated solution for bipolar stepper motors is required, eliminating the need for discrete power stages. It is suitable for designs needing built-in current regulation and step decoding logic. Consider the thermal dissipation capabilities of the 24-SO package relative to the expected load current. Verify compatibility with system voltage rails between 8V and 52V before implementation.

Part Context

The L6228DTR belongs to the STSPIN L62 series of motor drivers from STMicroelectronics. This series focuses on providing complete driving solutions for small to medium-sized motors using advanced semiconductor processes. The DTR suffix indicates the tape-and-reel packaging configuration for automated assembly. It serves as a core component in the broader portfolio of motion control ICs designed for industrial and consumer applications.

Replacement Considerations

L6228QTR: Alternative package variant (VFQFPN-32) with similar electrical characteristics but different physical footprint.