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Technology Front

New Power Supply IC Featuring the Industry's Highest Step-Down Ratio

Published: Sep 13,2017

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ROHM has recently announced the availability of a DC/DC converter with built-in MOSFET that achieves the highest step-down ratio in the industry (at 2MHz) required for 48V automotive systems such as mild hybrid vehicles.

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The BD9V100MUF-C integrates ultra-high-speed pulse control technology (Nano Pulse Control) created by combining proprietary circuit design and layout with original processes, enabling low voltage 2.5V output from 60V (max.) input at 2MHz (resulting in the industry's highest step-down ratio: 24:1). This makes it possible to miniaturize peripheral components while at the same time configure voltage conversion from high to low voltages using a single IC whereas 2 or more ICs are conventionally required, contributing to greater miniaturization and simpler system design.

In recent years, in the automotive sector where energy savings and environmental performance are increasingly demanded, mild hybrid vehicles utilizing 48V systems that provide better cost performance than full hybrid cars and improve fuel efficiency over conventional 12V power supply systems are attracting increased attention.

However, while 2MHz operation is always required for automotive systems, until now there has not been a power supply IC capable of stepping down 48V to the 3.3V or 5V needed for ECU drive, typically involving 2-stage step down to an intermediate voltage such as 12V.

In response, ROHM leveraged its vertically integrated production system that includes analog design technology and power processes to develop an ultra-high-speed pulse control technology ‘Nano Pulse Control' that achieves a 1-chip power system.

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