BM64070MUV-E2

Overview

The BM64070MUV-E2 is a sensorless three-phase brushless DC motor pre-driver IC manufactured by ROHM Semiconductor. It supports a maximum power supply voltage of 77 V and a peak output voltage of 100 V, with an operating range of 28 V to 77 V. The device features a built-in boost voltage circuit and operates within a temperature range of -40°C to +105°C. It utilizes a VQFN-40 package (6.0x6.0 mm) and accepts PWM input for speed control. The typical operating supply current is 6.4 mA, with an output current capability of 20 mA. It functions at frequencies between 1 kHz and 50 kHz.

Feature Summary

• Integrates sensorless sine wave drive capability with automatic lead angle control for smooth motor operation without external position sensors.
• Includes built-in speed feedback control that adjusts PWM duty cycle to match input commands with actual motor rotational speed.
• Features comprehensive protection mechanisms including motor lock protection, over-current protection, thermal shutdown, and voltage lock-out circuits.

Applications

• Fan motors requiring silent and low-vibration operation
• Paper feeding devices in office equipment
• Optical Disk Drives (ODD)
• Multi-prism devices

Procurement Notes

Verify the specific suffix E2 against the manufacturer's latest datasheet to confirm RoHS compliance and pinout compatibility. Confirm the VQFN-40 package dimensions and moisture sensitivity level requirements for your assembly process. Ensure the external FET selection aligns with the 77 V supply and 20 mA gate drive specifications. Check for any design-in restrictions or recommended alternative components if the part status changes.

Selection Notes

Select this component when designing systems that require sensorless control of three-phase BLDC motors up to 48 V nominal voltage. It is suitable for applications needing integrated speed regulation via PWM input without additional microcontroller complexity. Consider the VQFN-40 package size constraints and the need for external N-channel FETs for power switching. Evaluate the thermal performance given the -40°C to +105°C operating range.

Part Context

The BM64070MUV-E2 belongs to ROHM's series of pre-drivers for brushless DC motors. Unlike full bridge drivers, it requires external power transistors to handle the main load current. This specific model focuses on sensorless applications, distinguishing it from variants that support Hall sensors. It is part of a broader portfolio designed for high-efficiency and high-reliability motor control in consumer and industrial electronics.

Replacement Considerations

The BM64070MUV is listed as an alias for this part number. No other direct substitute part numbers are confirmed in the provided documentation. Verify functional equivalence if considering alternatives from other manufacturers, particularly regarding the sensorless algorithm and boost circuit integration.

FAQ

Does the BM64070MUV-E2 require Hall sensors for operation?

No, it is designed for sensorless operation and does not require external Hall elements for rotor position detection.

How is the motor speed controlled in this IC?

Speed is controlled via a PWM input signal. The IC uses built-in speed feedback control to adjust the PWM duty cycle, ensuring the motor speed matches the input command.

What type of drive waveform does this pre-driver support?

It supports sine wave drive with 180-degree commutation logic for smoother and quieter motor operation.