BLDC Fan Driver Chip For High-power Automotive Fans


Allegro has announced a three-phase BLDC motor controller chip solution that is targeted at high-power automotive fan applications with very low vibration and audible noise requirements. Key automotive applications include seat, battery, infotainment and headlamp cooling fans.

The A5932 is a three-phase sensorless BLDC fan MOSFET gate driver that incorporates sensorless sinusoidal drive to minimize audible noise and vibration for high power fans. A sinusoidal voltage profile is applied to the windings of the motor at startup to quietly and gradually ramp up the motor to the desired speed.

MOSFET gate driver outputs permit motor currents that can be scaled to fit the application requirements. A user-friendly GUI interface allows fast evaluation and a shorter time to market.


The motor speed is controlled by applying a duty cycle command to the speed (SPD) input. The SPD input is allowed to operate over a wide frequency range.

This new device has a 5.5 to 50 input voltage rating with an operating range of -40° to 150°C.

The A5932 is available in a 24-contact 4 mm × 4 mm QFN with exposed thermal pad (suffix ES), and a 24-lead TSSOP with exposed thermal pad (suffix LP). \

The QFN package is supplied in a wettable flank allowing visual PCB solder inspection. These packages are lead (Pb) free, with 100% matte-tin leadframe plating.

The A5932GESSR-T is priced at $3.456 and the A5932GLPTR-T is priced at $3.792, both in quantities of 1,000.

More information:

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