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
  • UL 2367, IEC 62368-1: File No. E520109




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


Type Title Date
Datasheet - Short-form PDF 105 KB
Brochure PDF 5.49 MB 日本語
Product Change Notice PDF 169 KB
Brochure PDF 1.11 MB
Product Change Notice PDF 179 KB
Datasheet Log in to Download PDF 1.72 MB
Manual - Software PDF 1.28 MB
Application Note PDF 509 KB
Application Note PDF 397 KB
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PCB Design Files ZIP 1.90 MB
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