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 RTKA489800DE0000BU 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 application versatile. In addition to 4-switch buck-boost configuration, it can also support the 2-switch Buck mode operation.

The RTKA489800DE0000BU 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 RTKA489800DE0000BU 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



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


Type Title Date
Manual - Software PDF 1.28 MB
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Design & Development

Software & Tools

Software Downloads

Type Title Date
PCB Design Files ZIP 1.90 MB
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