The RTKA2108502H00000BU evaluation board is an 8-layer FR4 board with 2oz. copper on all layers. The board measures 4. 7in x 4. 8in. The evaluation board includes placeholders for the pin-strap resistor population that allow for the adjustment of the output voltage, switching frequency, soft-start/stop timing, input UVLO, ASCR (gain and residual) parameters, and the device PMBus address. Also, fault limits can be programmed or changed easily with the PMBus compliant serial bus interface.

The evaluation board makes use of the RAA210850, a 50A step-down DC/DC power supply module with an integrated digital PWM controller, dual-phase synchronous power switches, inductors, and passives. Only input, output capacitors and minimal passives are required to finish the design. The board can output a continuous current at 50A without airflow or heat sink. The RAA210850 uses a ChargeModeTM control (ASCR) architecture that responds to a transient load within a single switching cycle.

Provided with the evaluation kit, the ZLUSBEVAL3Z (a USB to PMBus adapter) connects the evaluation board with a PC to activate the PMBus communication interface. The PMBus command set is accessed by using the PowerNavigatorTM evaluation software from a PC running Microsoft Windows.

The RTKA2108502H00000BU can operate in pin-strap mode without needing the ZLUSBEVAL3Z adapter or PMBus communication.


The PowerCompasTM tool helps you start your design in the right direction, giving you tools to find Renesas parts that match your requirements, set up multiple rails if needed, perform high-level system analysis and generate reference design files.

Find Parts


  • VIN range of 4.5V to 14V, VOUT adjustable from 0.6V to 5V
  • Programmable VOUT, input and output UVP/OVP, OTP/UTP, soft-start/stop, and external synchronization
  • Monitor: VIN, VOUT, IOUT, temperature, duty cycle, switching frequency, and faults
  • ChargeMode control tunable with PMBus
  • Mechanical switch for enable and a power-good LED indicator


  • Server, telecom, storage, and datacom, Industrial/ATE and networking equipment, General purpose power for ASIC, FPGA, DSP, and memory

Product Options

Part Number Part Status Buy Sample


Title language Type Format File Size Date
Datasheets & Errata
RAA210850 Datasheet Datasheet PDF 2.41 MB
RAA210870 Datasheet 日本語, 简体中文 Datasheet PDF 2.63 MB
RAA210833 Datasheet Datasheet PDF 2.69 MB
RAA210925 Datasheet Datasheet PDF 2.93 MB
RTKA2109252H00000BU Design Files Design File ZIP 1.49 MB
RTKA2108332H00000BU Design Files Design File ZIP 1005 KB
RTKA2108502H00000BU Design Files Design File ZIP 2.23 MB
RTKA2108702H00000BU Design Files Design File ZIP 2.44 MB
RTKA2108702H00000BU User Guide Manual PDF 1.64 MB
PowerNavigator User Guide for POL Manual PDF 4.68 MB
RTKA2109252H00000BU User Guide Manual PDF 2.02 MB
RTKA2108332H00000BU User Guide Manual PDF 1.35 MB
RTKA2108502H00000BU User Guide Manual PDF 1.79 MB
Production Configuration Utility User Guide Manual PDF 714 KB
PowerNavigator™ Software v5.4.139 Software ZIP 96.49 MB
Production Configuration Utility v5.4.139 Software ZIP 120.25 MB