There is an optimized performance in this voltage regulator because it utilizes the Tape & Reel (TR) package. A voltage of 3.8V volts can be generated by DC DC switching regulator.
RP506K001F-TR Features
RP506K001F-TR Applications
There are a lot of RICOH Electronic Devices Co., LTD. RP506K001F-TR Voltage Regulators applications.