BD9227F reduces component footprint by 75% by integrating existing discrete components into an IC

ROHM Co., Ltd. has developed the "BD9227F" step-down DC/DC converter, which is optimal for power supply for DC fan motors used for cold air circulation in refrigerators, etc.

Intelligentization, miniaturization, and high efficiency are the three major challenges facing the electronics industry recently, and market demand is rising. Furthermore, as approximately 50% of global power demand is used to drive motors, there is a demand for the realization of higher-level intelligent, compact, and high-efficiency motor drives for product structural design and environmental protection.

Until now, the power supply units of DC fan motors installed in refrigerators and the like have mostly consisted of discrete components. However, there was a challenge in that not only was high-precision control difficult, but high-frequency driving was also difficult, and the occupied area increased because large coils and output capacitors were required as peripheral components.

This product is a power IC capable of controlling the rotational speed of a DC fan motor with high precision by linearly controlling the output voltage according to the duty cycle of the PWM signal generated by the microcontroller.





Compared to the existing discrete component configuration, high-precision control, along with 1 MHz high-frequency driving and circuit optimization through the IC's analog circuit design technology, has been realized.

Accordingly, by miniaturizing peripheral components such as large coils and output capacitors, the component area can be reduced by approximately 75% compared to the existing configuration, and at the same time, power conversion efficiency can be improved by 19% (at an output current of 300mA), contributing to high precision, miniaturization, and improved power conversion efficiency in applications equipped with DC fan motors.

Mass production of this product began in October 2016 with a production capacity of 100,000 units per month.