MC33033P

Overview

The MC33033P is a monolithic brushless DC motor controller from onsemi, designed for open-loop control of three or four-phase motors. It integrates a rotor position decoder, temperature-compensated reference, programmable sawtooth oscillator, error amplifier, PWM comparator, and high-current drivers. The device operates within a 10 V to 30 V supply range and includes undervoltage lockout, cycle-by-cycle current limiting, and internal thermal shutdown.

Feature Summary

• Integrates rotor position decoder for proper commutation sequencing
• Features high-current totem pole bottom drivers suitable for power MOSFETs
• Includes internal thermal shutdown and cycle-by-cycle current limiting
• Provides selectable sensor phasings for efficient motor control

Applications

• Open-loop three-phase brushless DC motor control
• Four-phase brushless DC motor control
• Brush DC motor control with external MOSFET H-bridge

Procurement Notes

Verify the package type matches the required installation method, as the 'P' suffix typically indicates PDIP. Confirm that the specific revision supports the necessary sensor phasing options (60°/300° or 120°/240°). Ensure the operating voltage range aligns with the system's power supply constraints.

Selection Notes

Select this component for applications requiring integrated commutation logic without separate drive supply pins. It is suitable for cost-sensitive designs where closed-loop servo capabilities via the accessible error amplifier are needed but advanced fault signaling is not critical. Compare against MC33034/MC33035 if additional features like brake inputs are required.

Part Context

The MC33033P belongs to the second-generation family of brushless DC motor controllers from onsemi. It evolves from the full-featured MC33034 and MC33035 models by omitting certain complex interfaces while retaining core active functions. This simplification targets applications needing reliable open-loop control with reduced pin count and design complexity.

Replacement Considerations

MC33034DWG and MC33035DWG offer similar functionality with additional features such as separate drive supply pins and fault outputs. Verify pin compatibility and feature requirements before substitution.