L6208PD

Overview

The L6208PD is a fully integrated bipolar stepper motor driver manufactured by STMicroelectronics, utilizing BCD technology to combine isolated DMOS power transistors with CMOS and bipolar circuits. It operates within an 8 V to 52 V supply voltage range and delivers a continuous output current of 2.8 A RMS, with a peak capability of 5.6 A. The device features a typical on-resistance (RDS(on)) of 0.3 Ω at 25 °C and supports operating frequencies up to 100 kHz. It is housed in a PowerSO-36 surface-mount package and includes dual independent constant off-time PWM current controllers for precise chopping regulation.

Feature Summary

• Integrates dual DMOS full bridges with non-dissipative overcurrent protection on high-side MOSFETs and thermal shutdown capabilities.
• Features fast/slow decay mode selection and quasi-synchronous rectification for optimized motor performance.
• Includes decoding logic for full and half-step drive sequences alongside cross-conduction protection.

Applications

• Driving two-phase bipolar stepper motors
• Industrial automation control systems
• Precision motion control applications

Procurement Notes

Verify the specific suffix 'PD' against the manufacturer's official datasheet to confirm the PowerSO-36 package variant and tube packaging configuration. Ensure compatibility with system voltage requirements between 8 V and 52 V. Confirm that the 2.8 A RMS current rating aligns with the thermal management design of the target application board.

Selection Notes

Select this component when a robust, fully integrated solution for bipolar stepper motors is required without external discrete power stages. The PowerSO-36 package offers a balance of thermal performance and PCB footprint for surface-mount assembly. Consider the 100 kHz switching frequency limit when designing filter components or selecting clock sources for the PWM controllers.

Part Context

The L6208PD belongs to the L6208 series of stepper motor drivers from STMicroelectronics. This family provides complete drive solutions for two-phase bipolar motors, integrating power, control, and protection functions into a single chip. The series supports various packages including PowerDIP24, SO24, and QFN-48 variants to suit different thermal and spatial constraints.

Replacement Considerations

L6208Q

FAQ

What type of overcurrent protection does the L6208PD provide?

The device features non-dissipative overcurrent protection specifically on the high-side power MOSFETs, which helps prevent damage during fault conditions without excessive heat generation.

Can the L6208PD operate in half-step mode?

Yes, the device includes internal decoding logic that supports both full-step and half-step drive sequences for bipolar stepper motors.