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DC-DC converters meet space constraints with DFN packages

DC-DC converters meet space constraints with DFN packages

Mornsun’s 4th generation of R4 Series DC-DC converters are now available from Relec Electronics in ultra-miniature DFN packages, measuring just 9.0 x 7.0 x 3.1mm.

The ultra-miniature, surface-mount converters can save nearly 60% of board space, occupying just 63mm2, compared to 155mm2 for SMD8 footprint DC-DC converters. This enables developers to make significant space savings and reduce the overall size of distributed power supply systems, low frequency analogue circuits, industrial control, instrumentation and electric power products.

The R4 DC-DC converters are available as non-isolated switching regulators or unregulated DC-DC converters with 3kV isolation. The R4 Series comprises the K78_MT-500R4 non-isolated switching regulators and the B0505MT-1WR4 is a 1W isolated DC-DC converter. Providing high efficiency, low losses and offering short-circuit protection in a compact DFN package, the regulators are ideal for applications such as industrial control, instrumentation and electric power.

The K78_MT-500R4 switching regulators provide 500mA or regulated power and are available with outputs from 3.3V - 15Vdc from a 4.5V – 36Vdc input source.

With efficiencies of up to 92%, they allow systems to run cooler without the need for external heatsinks. This not only reduces cost and saves board space, it also increases reliability by running at reduced temperatures. The K78xxMT-500R4 series operating range is -40°C to +105°C. 

The B0505MT-1WR4 is a 1W DC-DC converter with a 5Vdc input and 5Vdc output. It operates over an ambient temperature range of -40°C to +125°C. The B0505MT-1WR4 achieves an exceptional 3000Vdc isolation in the ultra-miniature DFN package. Efficiency is up to 85% and no heatsink is required. Target applications are in distributed power supply systems and it is particularly suitable for use in applications such as digital circuits, low frequency analogue circuits, relay-driven circuits and data switching circuits.

Both the K78_MT-500R4 and the B0505MT-1WR4 are designed in accordance with AEC-Q100, for automotive applications.

The Mornsun R4 Series are available on a standard lead time of four weeks and Relec Electronics carries sample stocks to support your design effort and will work with customers to meet production requirements.


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