ROHM Proposes Solutions that
Optimally Combine Power Devices and Analog ICs

Rapid advancements in smart technology and automation are transforming various sectors, including automotive and industrial equipment. Power devices and analog ICs play a pivotal role in achieving this. ROHM not only leads the industry in commercializing high performance power devices, but also provides ICs that can maximize their performance.

Power devices responsible for power conversion, together with analog ICs that maximize their performance, are critical for the safe operation of power systems and equipment. At the same time, selecting the right electronic components can lead to lower power consumption and miniaturization.

However, as systems become more complex, electronic manufacturers must go beyond simply supplying components. They are now expected to provide support in achieving the desired performance while proposing solutions that facilitate the design process.

Improving System Performance with Power devices + Analog ICs

SiC power devices are currently garnering considerable attention in the field of power electronics. Their application in energy management applications such as electric vehicles and data centers enables the efficient use of power with minimal losses, contributing to energy conservation. However, SiC power devices alone cannot provide the necessary functionality. Pairing them with analog ICs is essential for achieving tasks like power conversion and motor control. System-level performance can be enhanced by optimally combining these components after considering their respective characteristics.

Yet only a handful of companies worldwide possess the resources and expertise to offer power devices and analog ICs as an integrated solution. ROHM is one of those select few.

Providing SiC Power Devices in Various Formats

Recognizing the remarkable material properties of SiC, ROHM has invested significant time and resources into research and development. As a result, in 2010 ROHM pioneered the mass production of SiC Schottky barrier diodes (SBDs) and SiC MOSFETs, and in 2012 was the first in the industry to commercialize full SiC power modules integrating SiC power devices. Essentially, ROHM has been at the forefront of bringing SiC power devices to the market in various forms, not just chips but also discrete devices and modules. Building on these achievements, in 2020 ROHM launched 4th Gen SiC MOSFETs featuring industry-leading low ON resistance.

Linking the 3 Pillars of IC Development

ROHM’s journey into IC development started in the 1970s. Over the years, the company has introduced a wide range of IC products to meet customer needs, primarily in the consumer electronics sector. ROHM emphasizes three key technologies for IC development, which form the foundation of its comprehensive development system. The three pillars are:
・Circuit Design
・Layout
・Processes
ROHM continues to launch cutting-edge products and solutions on the market that leverage accumulated analog technologies. Let’s look at three examples of these innovative offerings.

1.　Power Device + Gate Driver IC

SiC power devices offer numerous advantages, such as high-frequency operation, low ON-resistance, and superior breakdown voltage. However, they cannot function alone, requiring a gate driver to handle sufficient power safely. Driving SiC power devices is much more challenging than conventional Si products due to the increased risk of surges and ringing during high-speed switching.

To address this, ROHM provides gate driver ICs specifically designed for SiC power devices. These allow users to maximize the performance of SiC power devices, decreasing power consumption along with overall system size. What’s more, design issues can be prevented, resulting in lower design costs and shorter development time.

2.　SiC MOSFET-Equipped AC/DC Converters

Conventional AC-DC converters used in auxiliary power supplies for industrial equipment typically consist of 12 components, including Si power devices, control ICs, and heat sinks. ROHM revolutionized the industry by releasing a novel semiconductor product that combines an SIC power device and control circuit optimized for AC-DC converters in a single package. This provides two primary advantages. One is a reduction in the number of parts, improving conversion efficiency and reducing the risk of component failure. The other is the ability to fully leverage the switching characteristics of the SiC power MOSFET while preventing potential issues such as surges and ringing.

3.　Simulation tools for electronic circuits using SiC MOSFETs and other components

Simulation tools are becoming increasingly important in the development of printed circuit boards that incorporate semiconductors, making them an indispensable part of the process. ROHM offers a simulator tool called ROHM Solution Simulator that can be accessed on its website by simply registering as a user.

This tool enables users to analyze the behavior and characteristics of electronic circuits comprised of SiC MOSFETs and other power devices, along with driver ICs, power supply ICs, and passive components like shunt resistors. In essence, it allows for easy and accurate batch verification of solution circuits that closely resemble the customer’s actual usage environment. By performing verification, customers can identify potential issues like surges and ringing before assembling the actual electronic circuit, making it possible to take the necessary measures at an early stage. This streamlines development efforts, shortening development time considerably.