ROHM has 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.
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).
Nano Pulse Control refers to ultra-fast pulse control technology achieved by combining analog circuit design, layout, and processes utilizing ROHM’s vertically-integrated production system.
This contributes to greater miniaturization and system simplification in 48V applications ranging from mild hybrid vehicles and industrial robots to base station sub power supplies.
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.
The BD9V100MUF-C integrates ultra-high-speed pulse control technology (Nano Pulse Control) created by leveraging high voltage BiCDMOS processes and ultra-high-speed pulse control to achieve the industry’s highest step-down ratio through an unprecedented ON time of 9ns (switching ON time is the control pulse width of a power supply IC, in this case 10-9).
This makes low 3.3V or 5V (2.5V min.) output possible from high input voltages up to 60V for driving ECUs at 2MHz which will not affect the AM radio band (1.84MHz max.).
The ability to provide voltage conversion from high to low voltages in systems such as 48V power supplies used in mild hybrid vehicles with a single IC halves the number of parts required, reducing application size and simplifying system design, while high-frequency operation enables the use of smaller external components (i.e. coils).