L6228N

Overview

The L6228N is a DMOS fully integrated stepper motor driver realized in BCD technology, combining isolated DMOS power transistors with CMOS and bipolar circuits. It features a dual DMOS full bridge, constant off-time PWM current controller for chopping regulation, and a phase sequence generator for stepping sequences. The device supports an operating supply voltage from 8 to 52 V and delivers a 2.8 A output peak current (1.4 A RMS). It includes non-dissipative overcurrent protection on high-side MOSFETs, thermal shutdown, undervoltage lockout, and cross-conduction protection.

Feature Summary

• Integrates dual DMOS full bridges with constant off-time PWM current controllers for precise chopping regulation
• Features non-dissipative overcurrent protection on high-side power MOSFETs and thermal shutdown capabilities
• Includes decoding logic for full and half-step drive sequences with fast/slow decay mode selection

Applications

• Bipolar stepper motor control systems
• Industrial automation equipment
• Motion control applications

Procurement Notes

Verify the specific package suffix against official STMicroelectronics documentation, as the L6228 series utilizes various packages including PowerSO36 and SO24. Confirm that the 'N' designation corresponds to the intended pinout and mechanical dimensions. Ensure compatibility with the required operating voltage range of 8V to 52V and current ratings for the target application.

Selection Notes

Select this component for applications requiring a fully integrated solution for bipolar stepper motors without external discrete power stages. Consider the 1.4 A RMS current capability and 52 V maximum supply voltage. Evaluate the need for integrated protections such as thermal shutdown and overcurrent limiting, which reduce external component count compared to discrete solutions.

Part Context

The L6228 belongs to the L6228 family of dual brush DC and stepper motor drivers manufactured by STMicroelectronics. It is designed using BCD technology to integrate power and logic functions on a single chip. The family includes variants like the L6228QTR and L6228PD, differing primarily in packaging and temperature ranges while maintaining core functional specifications.

Replacement Considerations

Direct substitutes within the same family include the L6228QTR and L6228PD. Verify package compatibility, as the L6228N typically refers to the PowerSO36 or similar industrial package. Cross-reference electrical parameters such as RDS(ON) and operating temperature range to ensure equivalence.