L6228QTR

Overview

The L6228QTR is a fully integrated DMOS stepper motor driver manufactured by STMicroelectronics, designed for driving two-phase bipolar stepper motors. It operates within an 8 V to 52 V supply voltage range and delivers a peak output current of 2.8 A with an RMS rating of 1.4 A. The device features a typical on-resistance (RDS(on)) of 0.73 Ω at 25 °C and supports operating frequencies up to 100 kHz. It is housed in a 32-VFQFPN-EP package measuring 5 mm x 5 mm. The component includes dual independent constant off-time PWM current controllers, fast/slow decay mode selection, and decoding logic for full and half-step drive sequences.

Feature Summary

• Integrates a dual DMOS full bridge with non-dissipative overcurrent protection on high-side power MOSFETs and thermal shutdown capabilities.
• Features dual independent constant off-time PWM current controllers that perform chopping regulation for precise current control.
• Includes built-in decoding logic for stepper motor full and half-step drive sequences along with cross-conduction protection.
• Supports fast decay quasi-synchronous rectification and offers selectable fast or slow decay modes for optimized motor performance.

Applications

• Industrial automation systems requiring bipolar stepper motor control
• Motion control applications utilizing the L6228 family architecture
• General purpose stepper motor driver implementations

Procurement Notes

Verify the specific suffix QTR indicates tape and reel packaging when sourcing. Confirm the VFQFPN-32 package dimensions match your PCB footprint requirements. Ensure compatibility with the 8 V to 52 V supply range for your target application. Check humidity sensitivity levels and storage conditions prior to assembly. Validate that the 1.4 A RMS current rating meets your motor's electrical specifications.

Selection Notes

Select this component for applications requiring a fully integrated solution for bipolar stepper motors without external power transistors. Consider the 32-pin VFQFPN package for space-constrained designs. Evaluate the 100 kHz operating frequency against your system's switching requirements. Compare the 0.73 Ω RDS(on) against thermal management capabilities in your enclosure design.

Part Context

The L6228QTR belongs to the L6228 series of motor drivers from STMicroelectronics. This series utilizes BCD multipower technology to combine isolated DMOS power transistors with CMOS and bipolar circuits. The L6228Q variant specifically denotes the version available in the 32-VFQFPN-EP package, distinguishing it from other package options like PowerSO36.

Replacement Considerations

The L6228PDTR serves as a pin-compatible alternative within the same series but utilizes a PowerSO-36 package instead of the VFQFPN-32 form factor. Designers must verify mechanical fit and thermal dissipation characteristics when substituting between these package types.