MC33033DW

Overview

The MC33033DW is a monolithic brushless DC motor controller designed for open-loop control of three or four-phase motors. It operates within a supply voltage range of 10 V to 30 V and features an internal undervoltage lockout mechanism. The device integrates a rotor position decoder, a temperature-compensated reference providing 6.25 V for sensor power, and a frequency-programmable sawtooth oscillator. It includes fully accessible error amplifiers for closed-loop servo applications and cycle-by-cycle current limiting. The output stage consists of three high-current totem pole bottom drivers suitable for external MOSFETs.

Feature Summary

• Integrates a rotor position decoder with selectable 60°/300° or 120°/240° sensor phasings for proper commutation sequencing.
• Features high-current totem pole bottom drivers specifically designed to drive external power MOSFET bridges.
• Includes internal thermal shutdown protection and cycle-by-cycle current limiting for enhanced reliability.
• Provides a temperature-compensated 6.25 V reference capable of supplying power to external Hall effect sensors.

Applications

• Open-loop control of three-phase brushless DC motors
• Open-loop control of four-phase brushless DC motors
• Brushed DC motor control using external MOSFET H-bridge configurations

Procurement Notes

Verify the presence of the NCV prefix if automotive qualification under AEC-Q100 standards is required. Confirm package type and lead-free status against specific ordering suffixes. Ensure compatibility with the intended sensor phase selection configuration before procurement.

Selection Notes

Select this component when open-loop BLDC control is sufficient without requiring separate drive circuit supply pins or dedicated fault output signals found in predecessor models. Suitable for applications needing integrated sensor power and high-current direct MOSFET driving capabilities within a single SOIC-24 package.

Part Context

The MC33033DW belongs to ON Semiconductor's second-generation brushless DC motor controller family. It evolved from the full-featured MC33034 and MC33035 controllers but omits certain features like separate drive supply pins, brake inputs, and fault outputs to streamline implementation for standard open-loop applications.

FAQ

Does the MC33033DW include a dedicated brake input?

No, unlike its predecessors such as the MC33034 and MC33035, the MC33033DW does not feature a separate brake input pin.

What is the function of the internal reference voltage?

The device contains a temperature-compensated reference capable of supplying 6.25 V to power external rotor position sensors.