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Allegro’s New Green BLDC Fan Driver Lowers Data Center Energy Use and Improves Safety

November 12, 2019
A89331 Devices & Server Photo

World’s first three-phase BLDC driver with integrated power loss brake

 Allegro MicroSystems, a global leader in power and sensing solutions for motion control and energy efficient systems, today announced the launch of the world’s first three-phase BLDC driver IC with integrated power loss brake (PLB) features. The A89331 enables high airflow, compact fan designs with motors speeds up to 45Krpm, and output currents up to 3A at up to 18V.  The code-free, sinusoidal sensorless driver IC is designed to improve thermal efficiency, which reduces energy use and data center costs.  The new PLB features also improve safety and reduce the bill of materials (BoM) in the data center. 


“We created the A89331 in direct response to trends in the server market,” explains Andy Wang, Product Line Engineering Manager at Allegro. “It is the smallest yet most advanced solution for server and data center cooling fans.”

Creating a Greener, More Energy Efficient Data Center

When server fans malfunction or break, backflow causes them to go into reverse rotation. The other fans have to work harder to compensate for the resulting airflow, which increases power consumption. 

The unique, integrated PLB function in the A89331 applies a brake to fans that aren’t working properly, which eliminates the extra power use and increases thermal efficiency. The end result is lower energy consumption and lower data center costs.

Simplifying Solutions

The traditional solution to preventing reverse rotation of broken fans is adding external circuitry to function as the power loss brake—and these external components do not fit into 1U fans. BoM cost goes up and efficiency goes down. This approach also requires coding, which increases time to market. 

The A89331 is the world’s first and only solution that fits both a three-phase BLDC driver and PLB in a 1U fan. Plus, Allegro’s proprietary code-free drivers eliminate the need for software development and verification. Benefits include better performance, lower BoM cost, smaller footprint, reduced development cost and faster time to market.

Contributing to a Safer Data Center

A89331’s integrated power loss brake also stops fans from spinning when they are disconnected from power to prevent injury. 

“On top of all of these advancements, the A89331 is designed to run server fans at higher speeds and improve speed control accuracy,” said Wang. “We’ve integrated many functions that address market requirements and help our customers improve their own performance.” 

The A89331 offers a trapezoidal drive for higher RPMs and improves speed accuracy to ±1.5% @ 25◦C. 
A89331 has max input voltage operating rating of 18V with an operating range of -40° to 105°C.  It is available in a 28-contact 5 mm × 5 mm QFN with exposed thermal pad (suffix ES), and a 20-lead TSSOP with exposed thermal pad (suffix LP). These packages are lead (Pb) free, with 100% matte-tin leadframe plating.  

Samples of the A89331 are now available - request your samples today.