Microchip’s 3-phase BLDC fan motor driver is industry’s first with resistor-programmable, sensorless sinusoidal architecture

Additionally, the low-cost driver comes in a 3x3 mm UDFN package with a
0.5 mm thickness for space-constrained applications, such as thin laptops and tiny BLDC fans.

To enable high energy efficiency and quiet operation with low acoustic noise and mechanical vibration, the MTD6505 includes a 180-degree sinusoidal drive. Being a sensorless driver means that the MTD6505 eliminates the need for an external Hall-Effect sensor, reducing both cost and board space. Additionally, the driver provides a number of on-chip protection features to preserve the motor’s life and avoid harmful operating conditions, including thermal shutdown, over-current limiting and lock-up protection.

Microchip also announces the MTD6505 3-Phase BLDC Sensorless Fan Controller Demonstration Board (ADM00345), which is available now, priced at $59.99. This demo board integrates a 3-phase BLDC fan and three MTD6505 plug-in modules. Additionally, a free GUI is available for download, to simplify fan monitoring and control with the onboard PIC® microcontroller.

Key Facts:
• Fully integrated, single-chip, low-cost motor driver in ultra-thin, 3x3 mm UDFN package
• Resistor-programmable driver enables the selection of multiple back-EMF coefficient ranges
• Quietly and efficiently drives fans in portable-computing applications
• Eliminates the need for an external Hall-Effect sensor to reduce cost and size