ROHM, a globally recognized semiconductor manufacturer, has introduced a built-in MOSFET step-down DC/DC converter with the industry’s highest step-down ratio for 2MHz operation (switching), specifically designed for 48V power-driven in-vehicle systems such as mild hybrid vehicles. 
*1) "BD9V100MUF-C".
The "BD9V100MUF-C" features ROHM's ultra-high-speed pulse control technology, "NanoPulseControl," which integrates the strengths of circuit design, layout, and process technologies. It can output up to 60V high voltage input at 2MHz, converting it down to 2.5V low voltage (the industry’s highest step-down ratio of 24:1). This not only reduces the size of peripheral components but also enables more complex high- and low-voltage conversion structures that used to require multiple power ICs. Now, one single chip can achieve miniaturization and system simplification in one go.
This product was available for sampling in July 2017, with a sample price of 1,000 yen per unit (excluding tax). Mass production was expected to start in December 2017, with a monthly capacity of 100,000 units. The initial production was handled by ROHM Hamamatsu Co., Ltd. (Hamamatsu City, Japan), while later production would be managed by ROHM Electronics Philippines, Inc. (Philippines).
ROHM plans to expand the use of "NanoPulseControl" into industrial equipment this year, aiming to continue supporting the miniaturization and system simplification of industrial applications.
In recent years, the adoption of 48V power supply systems in the automotive sector has increased, driven by growing demands for energy efficiency and environmental performance. Compared to traditional 12V systems, 48V offers better fuel economy and cost-effectiveness compared to full hybrid vehicles, making mild hybrid cars increasingly popular.
However, there was a gap in the market for a 2MHz power supply IC that could directly step down 48V to 3.3V or 5V for driving the ECU (Electronic Control Unit). Previously, an intermediate 12V stage was required, resulting in a two-step conversion process.
To address these needs, ROHM developed the "NanoPulseControl" technology, leveraging its analog design expertise, power system knowledge, and vertical integration production model. This innovation allows for a "single-chip power system," meeting the rising demand in the automotive and industrial sectors.
The new product, "BD9V100MUF-C," incorporates ROHM’s advanced ultra-high-speed pulse control circuit and high-voltage BiCDMOS technology, achieving the world's smallest power supply IC with a switch-on time of just 9ns (9 × 10â»â¹ seconds). This enables the industry’s highest step-down ratio and supports 2MHz operation without interfering with the AM broadcast band (maximum 1.84MHz). It can deliver 5V and 3.3V (minimum 2.5V) outputs from a 60V input, ideal for ECU applications.
※ As of August 29, 2017, based on data from Roma.
This technology allows a 48V power system to convert high voltage to low voltage using only one power IC, reducing component count by half. This not only helps in miniaturizing the application but also simplifies the overall system. Additionally, high-frequency operation contributes to the reduction of external components like coils.
"NanoPulseControl" is an ultra-high-speed pulse control technology made possible through ROHM’s vertical integrated production system. By combining cutting-edge analog technologies in circuit design, layout, and manufacturing, it provides significant benefits for applications powered by 48V systems, such as mild hybrid vehicles, industrial robots, and base station auxiliary power supplies.
*1) DC/DC converter
A type of power IC that converts a direct current (DC) voltage into another DC voltage. Common types include buck (voltage drop) and boost (voltage increase) converters.
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