How to integrate all components of a POL converter into the inductor

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MEV Elektronik Service GmbH

Würth Elektronik eiSos GmbH & Co. KG

RECOM Power GmbH

SUMIDA AG

The reduction of losses by almost 35% is very significant, both from the point of view of heat dissipation in the product and also because of the energy savings. Large numbers of POLs are used in computing, telecommunication and industrial applications and every watt of energy reduction can save the end user over the product lifetime as much as 20 US-$ in electricity and infrastructure costs (IEEE study on the Worth of a Watt).

Other advantages of PSI²

This special module approach of Sumida offers other advantages as well as the outstanding efficiency. The magnetic material is a much better thermal conductor than typical plastics used for potting, so that the package surface temperature is very uniform with no hot spots. Overall temperature of the module was measured to be about 10 K cooler than the competing part under identical load conditions. A further competitor’s module showed a similar temperature rise as the Sumida module, but in a significantly larger package size (15 mm x 15 mm rather than 9 mm x 15 mm). Figure 4 shows an infrared image of the three parts under identical load conditions.

The first PSI² modules from Sumida are designed for a maximum current of 6 A and are available in two versions:SPM1004 (Figure 5) with 12 V input and SPM1005 (Figure 6) with 5 V/3.3 V input. Output voltages range from 5 V down to 0.6 V, covering all standard IC power rail requirements.

The SPM1006 module, which will be released in early 2016 will offer a maximum output power of 8 A as well as a wide input voltage range from 4 to 28 V and a fully adjustable output. Engineering samples are available immediately.

Furthermore, Sumida plans to extend the same innovative module concept to higher currents, and potentially also to modules with constant current output for LED driver applications.

Sumida’s new PSI² technology offers significant benefits in high density point of load modules and represents the new and innovative approach of POL integration. By maximizing the performance of the inductor, some of the limitations of a small package size can be overcome, avoiding the compromise of efficiency that is otherwise necessary.

This article is based on documents of Sumida AG, Obernzell, Germany.

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