BU69090NUX-TR

Overview

The BU69090NUX-TR is a single-phase brushless DC motor driver IC from ROHM Semiconductor, designed for fan motor applications. It operates on a supply voltage range of 1.8 V to 5.5 V with a typical operating voltage of 5 V. The device delivers an output current of 200 mA and features two half-bridge outputs. It supports PWM interface control and includes built-in Hall element detection. The component functions within a temperature range of -40°C to +85°C and is housed in a compact VSON-8 package (2 mm x 3 mm x 0.6 mm).

Feature Summary

• Integrates automatic gain control (AGC) and soft-switching technology for silent operation.
• Includes lock protection and auto-restart capabilities for enhanced reliability.
• Supports PWM speed control with low duty cycle start assistance.
• Features a dedicated standby mode to minimize battery consumption.

Applications

• Laptop cooling fans
• Single-phase BLDC fan motors
• Portable electronic device thermal management

Procurement Notes

Verify the specific suffix TR indicates tape-and-reel packaging when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor declarations. Ensure the VSON-8 footprint matches your PCB layout requirements. Cross-reference the datasheet revision date to confirm technical specifications align with your design constraints.

Selection Notes

Select this component for designs requiring low-voltage operation down to 1.8 V and compact surface-mount integration. It is suitable for applications prioritizing acoustic noise reduction through soft-switching drive methods. Consider the 200 mA output limit when sizing for specific fan motor loads. The integrated Hall sensor simplifies circuit design by eliminating external sensing components.

Part Context

This part belongs to ROHM's portfolio of single-phase DC brushless motor drivers, which are optimized for fan motors. The series emphasizes compatibility with various drive methods including PWM soft-switching. These controllers are engineered to balance efficiency and noise performance for consumer electronics and portable devices.

Replacement Considerations

The BU69090NUX is listed as an alias for this part number. No other specific substitute part numbers are confirmed in the provided public documentation. Verify pinout and electrical parameters against potential alternatives before implementation.

FAQ

Does the BU69090NUX-TR include internal Hall sensors?

Yes, the device integrates built-in Hall elements for rotor position detection.

What is the maximum operating temperature for this driver?

The maximum operating temperature is +85°C.

How is the motor speed controlled?

Speed is controlled via a PWM interface input signal.