High voltage (HV) bucks are widely used to power smart home IoT devices, home appliances, auxiliary power for industrial power, and E-meters. They are simple in design, low cost and require very little board space. Many electronic products use Bluetooth® Low Energy (LE) to exchange data through PCs, smartphones, as well as dedicated Bluetooth LE gateways. Bluetooth Low Energy has become one of the most popular standards for IoT applications. Renesas created a smart switching application by combining our HV buck and RX23W 32-bit microcontroller (MCU). This reference design shows a simple and effective design for a wall switch for smart appliances.

System Benefits​:

  • Renesas high voltage buck key advantages:
  • Zero standby power, good efficiency from light load to full load
  • Improved EMI by jittering and improved gate drive
  • Audible noise-free operation by avoiding operation in audible range
  • Renesas RX23W 32-bit MCU with Bluetooth LE
  • Low power consumption in Tx and Rx and sleep mode
  • Supports capacitive touch



  • Building automation
  • Home automation
Winning Combinations

Winning Combinations

Renesas' complementary product portfolios of Analog + Power + Embedded Processing + Connectivity work together to deliver comprehensive solutions. Our product experts have developed "Winning Combinations," compelling product combinations that help our customers accelerate their designs and get to market faster.

Discover More Winning Combinations