L6228Q

Overview

The L6228Q is a fully integrated bipolar stepper motor driver utilizing DMOS technology in a BCD process. It operates with an supply voltage range of 8 to 52 V and delivers a peak output current of 2.8 A (1.4 A RMS). The typical on-resistance is 0.73 Ω at 25 °C, supporting operating frequencies up to 100 kHz. The device features non-dissipative overcurrent protection, thermal shutdown, undervoltage lockout, and cross-conduction protection. It includes dual independent constant off-time PWM current controllers and decoding logic for full and half-step drive modes.

Feature Summary

• Integrates dual DMOS full-bridge, PWM current controller, and phase sequence generator for two-phase bipolar stepper motors
• Provides non-dissipative overcurrent protection on high-side power MOSFETs alongside thermal shutdown and undervoltage lockout
• Supports fast/slow decay mode selection and fast decay quasi-synchronous rectification for precise current regulation

Applications

• Industrial automation systems requiring bipolar stepper motor control
• Motion control applications utilizing full or half-step drive sequences
• Designs necessitating integrated overcurrent and thermal protection mechanisms

Procurement Notes

Verify the specific package variant, as the L6228 series includes PowerSO36 and SO24 options. Confirm that the Q suffix corresponds to the required RoHS compliance status and humidity sensitivity classification. Ensure the selected component matches the intended operating temperature range of -25 C to +125 C. Cross-reference the datasheet for exact pinout configurations to prevent integration errors during PCB layout.

Selection Notes

Select this component when a single-chip solution for bipolar stepper motors is required, eliminating external discrete drivers. The integrated decoding logic simplifies interface requirements by handling full and half-step sequences directly. Consider the 0.73 Ω typical RDS(on) for thermal management calculations under continuous load conditions. The device is suitable for designs needing robust protection features without additional circuitry complexity.

Part Context

The L6228Q belongs to the L62xx family of dual brush DC and stepper motor drivers from STMicroelectronics. This family emphasizes high integration and efficiency for electric motor control applications. The L6228 specifically targets bipolar stepper motors, distinguishing itself from other family members designed for brushed DC or universal motors through its dedicated phase sequence generation capabilities.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.