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Reference Design -ROHM Buck DC/DC Converter BD9A300MUV

The reference circuit design of DC/DC Converter BD9A300MUV (128-8885)  (ROHM) was converted into Designspark PCB format. The BD9A300MUV (128-8885)  is a 2.7V to 5.5V input, integrated 3A MOSFET 1ch synchronous buck switching regulator .

3D view


Buck DC/DC Converter BD9A300MUV

BD9A300MUV is a synchronous buck switching regulator with built-in low On-resistance power MOSFETs. It is capable of providing current up to 3A. The SLLM(TM) control provides excellent efficiency characteristics in light-load conditions which make the product ideal for equipment and devices that demand minimal standby power consumption. The oscillating frequency is high at 1MHz using a small value of inductance. It is a current mode control DC/DC converter and features high-speed transient response. Phase compensation can also be set easily.


  • Input Voltage Range: 2.7V to 5.5V
  • Output Voltage Range: 0.8V to VPVIN×0.7V
  • Average Output Current: 3A(Max)
  • Switching Frequency: 1MHz(Typ)
  • High-Side MOSFET On-Resistance: 60mΩ(Typ)
  • Low-Side MOSFET On-Resistance: 60mΩ(Typ)
  • Standby Current: 0μA(Typ)


What is included in the reference design file?

A Schematics design file (.sch), a PCB layout design file(.pcb), and parts library files for the design are provided. A RS part number and size information of parts are already linked to each part in the library. So you can directly order parts to RS by using the BOM quote feature, or can convert PCB files into 3D CAD data to design and simulate cases of boards. Of course, parts in the library would be used in another design. 



PCB layout


Parts Library


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