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Reference Design -ROHM Buck DC/DC Converter BD9C301FJ

The  reference circuit design of DC/DC Converter BD9C301FJ  (128-8887)  was converted into Designspark PCB format. The BD9C301FJ is a 4.5V to 18V Input, 3.0A integrated MOSFET 1ch synchronous buck switching regulator .

3D VIew


Buck DC/DC Converter BD9C301FJ

BD9C301FJ is a synchronous buck switching regulator with built-in low on-resistance power MOSFETs. With wide input voltage range, it is capable of providing current of up to 3 A. 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: 4.5V to 18.0V
  • Reference Voltage: 0.8V ± 1%
  • Maximum Output Current: 3A(Max)
  • Switching Frequency: 500kHz(Typ)
  • Pch MOSFET On Resistance: 65mΩ(Typ)
  • Nch MOSFET On Resistance: 35mΩ(Typ)
  • Standby Current: 1μA (Typ)
  • Operating Temperature Range: -40°C to +85°C


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