ROHM – BD9G341AEFJ : Ultra-High-Efficiency 76V DC/DC Buck Converter

• Provides greater reliability and energy savings ideal for communications infrastructure and industrial equipment
• High reliability protection against accidental surges
• High efficiency delivers greater energy savings
• High Breakdown Voltage is ideal for high-power industrial equipment
• Small/Compact footprint and fewer external parts minimize mounting area

ROHM’s new BD9G341AEFJ 3A variable output voltage DC/DC buck converter with integrated 76V MOSFET features the lowest ON resistance and highest accuracy in its class along with a wide frequency range (50kHz to 750kHz) and industry-low standby current (10μA max.).

In addition, advanced high-voltage 0.6μm BiCDMOS process is utilized to achieve a continuous operating input range of 12V to 76V and an industry-leading maximum breakdown voltage of 80V (the highest in ROHM’s non-isolated DC/DC converter lineup), while market-proven advanced analog design technology results in superior conversion efficiency. Furthermore, multiple protection circuits minimize heat generation – even during output pin shorts (contact) – preventing possible damage and increasing reliability vs. conventional products. And the compact 8-pin package requires fewer parts and reduces mounting area, contributing to easier PCB placement and end-product miniaturization.



Part No.Input Voltage RangeOutput Voltage RangeOperating Frequency RangeRDS(ON) (Typ.)Max Output CurrentStandby Current (Max.)Operating Temp. RangePackageEvaluation Board
BD9G341AEFJ12V ~ 76V1.0V ~ Vcc50kHz ~ 750kHz150mΩ3.0A10μA-40ºC ~ +85ºCHTSOP-J8Yes


  • Wide input voltage range: 12V to 76V
  • High conversion efficiency
  • Fewer external components required
  • Compact 8-pin package
  • Best-in-class ON resistance: 150mΩ
  • Broad frequency range: 50kHz to 750kHz
  • Industry-low standby current (10μA max.)
  • Class-leading accuracy: ±1.5%
  • Superior current output: 3A
  • Optional eval board enables easy verification of operation and characteristics


  • Communications infrastructure (switching stations, routers, telephone systems)
  • Motors exposed to high surge voltages (electric bicycles, vacuum cleaners)
  • Factory automation equipment
  • Industrial machinery