MC33035DW

Overview

The MC33035DW is a high-performance monolithic brushless DC motor controller designed for three or four phase systems. It operates within a supply voltage range of 10V to 30V and features a programmable sawtooth oscillator with a typical switching frequency of 28kHz. The device integrates a rotor position decoder, temperature-compensated reference, and error amplifier. It utilizes a 24-pin SOIC package with dimensions of 15.54mm length and 2.36mm height. Operating temperatures span from -40°C to 85°C, with a maximum power dissipation of 650mW.

Feature Summary

• Integrates a rotor position decoder for proper commutation sequencing in open-loop control applications.
• Provides fully accessible error amplifier support for closed-loop servo system implementations.
• Includes internal thermal shutdown and cycle-by-cycle current limiting for enhanced protection.

Applications

• Three-phase brushless DC motor control systems
• Four-phase brushless DC motor control systems
• Closed-loop servo applications requiring external tachometer integration

Procurement Notes

Verify the specific suffix designation when ordering, as variations such as NCV prefixes indicate automotive-grade specifications with site and control changes. Confirm RoHS compliance status, as some historical batches may be non-compliant. Ensure the selected package variant matches the required tape-and-reel or tube configuration for manufacturing compatibility.

Selection Notes

Select this component for designs requiring integrated commutation logic without external microcontrollers. It is suitable for applications needing direct MOSFET driving via high-current bottom drivers. Consider the selectable sensor phasing options (60°/300° or 120°/240°) to match existing encoder hardware. Evaluate thermal management requirements given the 650mW dissipation limit in the SOIC-24 package.

Part Context

This part belongs to the MC33035 series of second-generation brushless DC motor controllers. It serves as a dedicated analog solution for motor drive applications, distinguishing itself by combining power driver interfaces with control logic in a single IC. The family includes variants optimized for different packaging and environmental standards.

Replacement Considerations

MC33035DWR2G

FAQ

Does the MC33035DW support closed-loop speed control?

Yes, it features a fully accessible error amplifier designed for closed-loop servo applications, though an external tachometer signal is typically required for RPM monitoring.

What sensor phasing options are available?

The device allows selection between 60°/300° or 120°/240° sensor phasings to accommodate different Hall effect sensor configurations.