Power management is packaged in a Tape & Reel (TR) way. For your reference, this PMIC includes a list of SOT-23-5 functions. There are also other types of integrated circuits included in the supervisor, like POWER SUPPLY SUPPORT CIRCUIT.
RP300N29AC3-TR-FE Features
RP300N29AC3-TR-FE Applications
There are a lot of RICOH Electronic Devices Co., LTD. RP300N29AC3-TR-FE Voltage Supervisors applications.