Fan driver IC, external FET power required
TC78B009FTG, rotary position detection using inductive voltage
Motor rotation control without hall sensor


As server capacity and performance increase, the demand for fans to dissipate the heat generated by the equipment is increasing. Fans are also needed in blowers, vacuum cleaners, and pumps.

The fan driver IC that drives these fans must be able to drive external FETs to deliver more power.

Toshiba Electronic Devices & Storage Corporation announced on the 4th that it will begin mass production and shipment of the pre-driver IC 'TC78B009FTG' for three-phase brushless motor control.

The TC78B009FTG controls motor rotation without Hall sensors by detecting rotational position from induced voltage. High-speed rotation is achieved with a 150° square wave drive. Eliminating the Hall sensor not only reduces mounting space and IC cost, but also reduces motor size and costs.

Closed-loop speed control also maintains consistent motor speed under severe power or load fluctuations. Because the onboard non-volatile memory (NVM) and TC78B009FTG accurately set the speed profile, there is no need for an external MCU to control closed-loop speed.

Additionally, the internal NVM controls the FET gate current, allowing the use of a variety of FETs.

FET gate current setting for slew rate control, selective forward and reverse rotation, PWM duty signal and analog voltage signal, speed control via I2C, and various settings supported via I2C interface.

TC78B009FTG, manufactured in a 5×5×0.8mm WQFN36 package, can be checked for availability and purchased online .