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Question

What is the difference between DC/DC converters and DC/DC controllers?

Answer

DC/DC Switching RegulatorsFunction

Ricoh’s DC/DC converters are equipped with internal or external output transistors.

The device equipped with an internal output transistor and the Lx pin is classified as DC/DC converter.
The device equipped with an external output transistor and the EXT pin is classified as DC/DC controller.
The device equipped with both internal and external output transistors is listed along with the DCDC converters.

A power MOSFET should be used with the external output transistor type.
To achieve high efficiency under heavy load, a MOSFET with a low ON resistance should be used.
To achieve high efficiency under light load, a MOSFET with a small gate capacity should be used.
As for MOSFETs, the maximum drain current should be higher than the maximum inductor current.

RP505Kxx1A/B
(Internal Output Transistor Type)

RP505Kxx1A/B (Internal Output Transistor Type)

R1224Nxx2E/F/G/H/L/M
(External Output Transistor Type)

R1224Nxx2E/F/G/H/L/M (External Output Transistor Type)

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