MC33033PG

Overview

The MC33033PG is a monolithic brushless DC motor controller designed for open-loop control of three or four-phase motors. It integrates a rotor position decoder, temperature-compensated reference, frequency-programmable sawtooth oscillator, error amplifier, PWM comparator, and driver outputs. 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 protection.

Feature Summary

• Integrates complete open-loop control functions including position decoding and PWM generation
• Features high-current totem pole bottom drivers suitable for external MOSFET bridges
• Includes selectable sensor phasing options for flexible motor configuration
• Provides internal thermal shutdown and cycle-by-cycle current limiting for reliability

Applications

• Open-loop control of three-phase brushless DC motors
• Control of four-phase brushless DC motors
• Brushed DC motor applications using external MOSFET H-bridge
• Industrial fan and pump speed control systems

Procurement Notes

Verify the package type matches the required PCB footprint, as the PG suffix typically indicates a specific plastic package variant. Confirm that the operating voltage range aligns with the system's power supply rails. Ensure that the selected component meets the necessary environmental specifications for the intended application environment.

Selection Notes

Select this component when an integrated solution for open-loop BLDC control is required without the need for separate drive supply pins or fault outputs found in predecessor models. Consider the MC33033PG for designs needing built-in thermal protection and current limiting. Evaluate the available sensor phasing options to ensure compatibility with the chosen Hall effect sensors.

Part Context

This part belongs to onsemi’s second-generation brushless DC motor controller family, evolving from the MC33034 and MC33035 series. It simplifies design by integrating active functions into a single chip while omitting features like separate drive supply pins. The NCV prefix variants are available for automotive applications requiring AEC-Q100 qualification.

Replacement Considerations

The MC33033DW serves as a direct pin-compatible alternative with identical functionality but in a different package. Predecessor models such as the MC33034 and MC33035 offer additional features like brake inputs and fault outputs but require more external components.