DC/DC Converter Application Note

Internal or External Output Driver Transistor

Ricoh has DC/DC converter types available with an internal output transistor and external output transistor. In internal types have an Lx pin and are called DC/DC converters, the external types have an EXT pin and are called DC/DC controllers. (If a specific product has both types available it is listed as a DC/DC converter)
When using an external output transistor, select a power MOSFET. When efficiency at high loads is important select a MOSFET with a low ON resistance, but when efficiency at a low loads is more important select a MOSFET with small gate capacity. Please use a MOSFET that has a maximum drain current higher than the maximum coil current (ILmax).

Internal or External Output Driver Transistor

Downloads

You can download application notes in PDF format.

  • Voltage Regulator
    (11 pages/823KB)
  • Microcontroller Supervisory ICs
    (7 pages/579KB)
  • DC/DC Converter
    (7 pages/525KB)
 

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