9ns minimum on-time enables 2MHz high-ratio dc-dc converter : 2.5V from 60V

Rohm BD9V100MUF

Called BD9V100MUF-C, the BiCDMOS chip includes output mosfets and is aimed at 48V automotive systems. 2MHz operation keeps it out of the 2MHz the AM radio band (1.84MHz max).

“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,” said the firm.

Helpfully, the data sheet includes a automotive front-end filter reference design (page 29).

Protections include: over-current, Input under-voltage, input over-voltage and thermal shut-down. Reverse input protection is not on the list, so the front-end reference design includes a diode.

Qualification is to AEC-Q100 Grade 1, soft-start is included, and control is current mode – there is a pin for loop compensation.

The chip has been sampling for a while, and is due to be in full production next month.

  • 16 to 60V input
  • 0.8 to 5.5V output (1A)
  • 1.9 to 2.3MHz operation (set by resistor, 2.1MHz typ)
  • -40ºC to 125ºC (output is ±2% over this)
  • QFN24 with heat pad


  • mild hybrid vehicles
  • industrial robots
  • basestation sub-power-supplies


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