Highly Efficient DC-DC Switching regulator

Featured Product from Mornsun Power

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MORNSUN K78 series are non-isolated, highly efficient switching regulators. Compared to regular linear regulator, the K78 series offers a wide input voltage range, smaller size, high efficiency, no heat sink, and better price. In addition, compared to discrete self-build solutions, the K78 series are comparable in price, more versatile, and has better performance and reliability. Through continuous technological innovation, MORNSUN K78 series are available in a variety of options, the conventional 0.5A-2A pin-compatible SIP package (Compatible with LM78 linear regulator pin) , and 0.5-1A SMD package. Moreover, the latest generation of ultra-small volume R4 products in DFN package is a small size, low cost, high performance products. As a universal voltage conversion product, K78 are widely used in IoT, automotive electronics, medical, robot, communications, photovoltaic and other industries.

Comparison between Switching regulator and Linear regulator 

Engineers sometimes consider using Linear regulator(LM7805 or LDO) with simple peripheral circuit and system cost pressure factors. In fact, its efficiency is very low, taking 24V or higher input and 5V output as an example, the efficiency is less than 20% and the heat is serious which stores up risks to system reliability. Additionally, the temperature problem can be improved by adding a heat sink, but two new problems will arise, one is the large dimension of the heat sink, the other is that the price of a heat sink is not cheap. By contrast, taking Mornsun new switching regulators K78-R4 as an example, the efficiency can be up to 83% at 24V or higher input and 5V output, and as high as 95% efficiency at 7V input, whilst Mornsun K78-R4 products has a micro-size without peripheral circuit needs and no heat problems.


  • Ultra-wide Input: 4.5-36VDC/9-90VDC
  • High efficiency up to 95%(No heat sink)
  • Operating temperature range: -40°C to +85°C/105°C
  • No-load input current as low as 2mA
  • Output short-circuit protection
  • EN62368 approval


  • Communications
  • Industrial control
  • Instrumentation
  • Medical
  • Electric power
  • Photovoltaic