The RTKA210040DR0000BU demonstration board features the RAA210040. Capable of delivering up to 4A of continuous current, the RAA210040 is a compact, synchronous step-down, non-isolated complete power supply that is optimized for space-constrained applications. The RAA210040 is based on a peak current mode PWM control scheme that provides a fast transient response and excellent loop stability. The switching frequency is programmable from 500kHz to 4MHz with either the external resistor or synchronization to an external clock through the SYNC pin.

The RTKA210040DR0000BU demonstration board is a 1×1 inch 4-layer FR4 board with 2oz. copper on all layers. It is optimized to minimize the complete power module solution size. Operating from a single 2.7V to 5.5V input power rail, the RTKA210040DR0000BU demonstration board offers adjustable output voltages down to 0.6V, up to 95% efficiency, and better than 1.5% accuracy over line, load, and temperature. A dedicated enable pin and power-good flag allows for easy system power rails sequencing.

By default, the board is set to a 1.2V output voltage with a 1.2MHz switching frequency.


  • Wide input voltage range from 2.7V to 5.5V
  • Adjustable output voltage down to 0.6V with ±1.5% accuracy over line, load, and temperature
  • Up to 95% conversion efficiency
  • 100% duty cycle
  • Internal 1ms soft-start time
  • Prebias output start-up
  • External frequency synchronization up to 4MHz
  • Dedicated enable pin and PGOOD flag
  • UVLO, overcurrent, negative overcurrent, overvoltage, and over-temperature protections



  • Telecom, Industrial, optical, and medical equipment
  • Point-of-load conversions
  • MCU, MPU, DSP, and FPGA


Type Title Date
Manual - Development Tools PDF 2.08 MB
Datasheet PDF 987 KB
2 items

Design & Development

Software & Tools

Software Downloads

Type Title Date
PCB Design Files ZIP 729 KB
1 item