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DC/DC Converter Application Note

Internal or External Output Transistors

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 DC/DC 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.

Internal or External Output Driver Transistor

External Output Transistor Type

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