The RAA489800 is a bidirectional, buck-boost voltage regulator that provides buck-boost voltage regulation and protection features. The advanced Renesas R3™ Technology provides high light-load efficiency, fast transient response, and seamless DCM/CCM transitions. The RAA489800 takes input power from a wide range of DC power sources up to 23V (such as conventional AC/DC adapters (ADP), USB PD ports, travel ADP) and safely converts it to a regulated voltage up to 21V. The RAA489800 can also convert a wide range DC power source connected at its output (system side) to a regulated voltage to its input (ADP side). This bidirectional buck-boost regulation feature makes the RAA489800's application very flexible. In addition to 4-switch buck-boost configuration, it can also support 2-switch Buck mode operation. The RAA489800 includes various system operation functions such as the Forward mode enable pin, Reverse mode enable pin, programmable soft-start time, and adjustable forward and reverse VOUT. It also has forward and reverse power-good indicators. The protection functionalities include OCP, OVP, UVP, and OTP. The RAA489800 has serial communication through SMBus/I2C that allows programming of many critical parameters to deliver a customized solution. These programming parameters include, but are not limited to: output current limit, input current limit, and output voltage setting.


  • Bidirectional buck, boost, and buck-boost operation
  • Configurable for 4-switch buck-boost or 2-switch buck operation
  • Input voltage range: 3.8V to 23V (no dead zone)
  • Output voltage: up to 21V
  • Up to 1MHz switching frequency
  • Pin programmable soft-start time
  • LDO output for VDD and VDDP
  • System FAULT status ALERT function
  • Input/output internal discharge function
  • Active switching for negative voltage transitions
  • Pass Through mode in both directions
  • Forward and Reverse mode enable pins
  • OCP, OVP, UVP, and OTP protection
  • Absolute overvoltage protection
  • SMBus and auto-increment I2C compatible
  • Pb-free (RoHS compliant)
  • 32 Ld 4x4 TQFN package


  • Tablets
  • Ultrabooks
  • Power banks
  • Mobile devices
  • USB-C

Product Options

Part Number Part Status Pkg. Type Carrier Type Buy Sample
Active TQFN Tube
Active TQFN Reel
Active TQFN Tube
Active TQFN Reel

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
RAA489800 Datasheet Datasheet PDF 740 KB
RAA489800 Data Short Short Form Datasheet PDF 118 KB
User Guides & Manuals
RTKA489800DE0000BU User's Manual Manual PDF 1.28 MB
Application Notes & White Papers
AN1684: Nonideality of Ground Application Note PDF 397 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
RTKA489800DE0000 Design Files Design File ZIP 1.90 MB
Industrial Power Management Brochure ( R16CL0001EJ0200 ) 日本語 Brochure PDF 3.13 MB

Boards & Kits

Part Number Title Type Company
RTK-251-BuckBoostConverter2 DC-DC Module Evaluation Kit for Universal USB Power Delivery AC Adaptor Evaluation Renesas
RTK-251-DRPEVB Firmware Development Evaluation Kit for Universal USB Power Delivery Evaluation Renesas