Murata MY Series UltraBK™ 4A/6A DC/DC Converter Modules

Murata MY Series UltraBK™ 4A/6A DC/DC Converter Modules are miniature UltraBK, called "Ultra Block", an ultra-thin high efficiency integrated power solution that combines a 4A or 6A DC/DC converter with components. These totally integrated modules provide up to 90% or 90.5% efficiency in a small, thin LGA package that measures 10.5mm x 9.0mm x 2.1mm. The easy-to-use module terminal design allows a simple power layout and maximum efficiency by minimizing routing parasitic resistance. Other features include power good output, overcurrent and overtemperature protection, remote on / off control, and output voltage sense. 

Murata MY Series UltraBK 4A/6A DC/DC Converter Modules are well-suited for use in PCIe / server applications, FPGA and DSP, datacom / telecom systems, distributed bus architectures (DBA), programmable logic, and mixed voltage systems. Some versions can also be used in I2C 6.0-compatible serial interfaces operating up to 1MHz.


  • 2-stage buck architecture
  • High efficiency of 90% for 2.1mm height
  • Fast transient response
  • Low input ripple
  • Low EMI
  • Output voltage adjust with trim resistor or I2C
  • Outstanding thermal derating performance
  • Overcurrent protection
  • On/off control (positive logic)
  • Power good signal


  • PCIe / servers
  • FPGA and DSP
  • Datacom / telecom systems
  • Distributed bus architectures (DBA)
  • Programmable logic and mixed voltage systems
  • I2C 6.0-compatible serial interface operating up to 1MHz, depending on model


  • Ultra-thin/small 10.5mm x 9.0mm x 2.1mm LGA package
  • Up to 90% or 90.5% efficiency
  • Up to 4A or 6A
  • 6.0V to 14.4V input voltage range
  • 0.7V to 1.8V output voltage
  • -40°C to +105°C operating ambient temperature

Murata 2-Stage Solution

Murata MY Series UltraBK™ 4A/6A DC/DC Converter Modules

Comparison Charts

Simplified Application Circuit Diagrams


Published: 2020-09-04 | Updated: 2022-08-30