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Application Note : DCDC Converters (Switching Regulators)

Diode Rectifier and Synchronous Rectifier

Ricoh's step-down DCDC converters use diode rectifier and synchronous rectifier.
The diode rectifier type uses a schottky diode and the synchronous rectifier type uses a MOS transistor in the low-side switches.

The high-side and low-side MOS transistors are built in most of the Ricoh's DCDC converters except for the R1242, which uses synchronous rectifier and an external low-side MOS transistor.

R1240 (Diode Rectifier Type)

R1240 (Diode Rectifier Type)

RP500 (Synchronous Rectifier Type)

RP500 (Synchronous Rectifier Type)

DCDC Converter with Synchronous Rectifier Type

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