9-A Buck Converter and Inductor Fit In Compact QFN
[2008-7-16]
Tag : MM Converter
With its introduction of a 9-A synchronous buck converter, Enpirion extends its portfolio of power converter ICs with copackagedinductors to a higher current level, offering designers a verycompact point-of-load power solution. The EN5395QI combines amonolithic buck converter and a bar-style inductor in a 10-mm x12-mm x 1.85-mm QFN package. The converter accepts a 2.375-V to5.5-V input.
As with the company's previously introduced parts, the converterdie and the inductor sit side-by-side in the IC-style package.However, the type of inductor used in the EN5395QI is different.The new part uses a bar-type inductor in which copper-strapwindings are wound around the core material. In contrast, theexisting Enpirion devices employ a high-aspect ratio, conventionalwirewound inductor that is self-shielding.
The advantage of the bar inductor is that it permits a highercurrent rating in a smaller form factor. That reduction in inductorsize offsets the increase in die size that was needed to raise thecurrent rating from 6 A, which was previously the highest currentrating offered by an Enpirion buck converter. The die used in the9-A part is larger than in the 6-A model because the higher currentrating requires greater die area for the power MOSFETs.
But as already mentioned, the smaller inductor makes up for thelarger die such that the EN5395QI comes in the same package as thecompany's existing 6-A part. Not only are the footprints the same,but pinouts are as well. So it's possible, to layout a board forthe 6-A buck converter and then upgrade to 9 A by dropping in theEN5395QI. However, the company also plans to introduce a new 6-Adevice using the bar inductor and that part will come in a smallerpackage than the existing 6-A converter.
The EN5395QI requires as few as five external MLCC capacitors for acomplete point-of-load converter and occupies a total footprint of250 square mm. The EN5395QI delivers up to 30 W of continuousoutput, and achieves up to 93% efficiency (see the figure). Thisperformance translates to a power density of over 76 W/in. 2 or over 11 W/cm 2 .
With its introduction of a 9-A synchronous buck converter, Enpirion extends its portfolio of power converter ICs with copackagedinductors to a higher current level, offering designers a verycompact point-of-load power solution. The EN5395QI combines amonolithic buck converter and a bar-style inductor in a 10-mm x12-mm x 1.85-mm QFN package. The converter accepts a 2.375-V to5.5-V input.
As with the company's previously introduced parts, the converterdie and the inductor sit side-by-side in the IC-style package.However, the type of inductor used in the EN5395QI is different.The new part uses a bar-type inductor in which copper-strapwindings are wound around the core material. In contrast, theexisting Enpirion devices employ a high-aspect ratio, conventionalwirewound inductor that is self-shielding.
The advantage of the bar inductor is that it permits a highercurrent rating in a smaller form factor. That reduction in inductorsize offsets the increase in die size that was needed to raise thecurrent rating from 6 A, which was previously the highest currentrating offered by an Enpirion buck converter. The die used in the9-A part is larger than in the 6-A model because the higher currentrating requires greater die area for the power MOSFETs.
But as already mentioned, the smaller inductor makes up for thelarger die such that the EN5395QI comes in the same package as thecompany's existing 6-A part. Not only are the footprints the same,but pinouts are as well. So it's possible, to layout a board forthe 6-A buck converter and then upgrade to 9 A by dropping in theEN5395QI. However, the company also plans to introduce a new 6-Adevice using the bar inductor and that part will come in a smallerpackage than the existing 6-A converter.
The EN5395QI requires as few as five external MLCC capacitors for acomplete point-of-load converter and occupies a total footprint of250 square mm. The EN5395QI delivers up to 30 W of continuousoutput, and achieves up to 93% efficiency (see the figure). Thisperformance translates to a power density of over 76 W/in. 2 or over 11 W/cm 2 .
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