ISL6559EVAL2【PDF 6/12 页】EVALUATION BOARD 2 ISL6559

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Application Note 1137

Adapting Circuit Performance

This design represents one solution for meeting the present

requirements on voltage regulators powering AMD Hammer

Family processors. This low cost approach can be

augmented to meet changing performance and cost

requirements. Over the life of the processor, some features

could be enhanced, resulting in higher processor quiescent

or transient current specifications. Given suitable

motherboard space and component selection, this design

can support 20A per phase or more if required. With the

flexibility to support 2, 3, or 4 phases, the ISL6559 controller

covers an array of future designs.

If the cost curve of a design must be tilted lower, a different

combination of upper and lower MOSFETs with higher

r DS(ON) can be employed. The trade-off for lowering cost is

reduced efficiency and thermal performance.

In cases where efficiency is paramount, a lower r DS(ON)

synchronous MOSFET or pair of MOSFETs can achieve

efficiencies over 90%.

If board area is a premium, the ISL6559 switching frequency

can be raised to reduce solution size. MOSFET technology

continues to drive die size down and new packaging options

provide improved thermal performance in smaller packages.

Implementing designs with 20A per channel or less typically

occupy the least amount of board space.

6

Summary

The ISL6559EVAL2 is an adaptable evaluation tool which

showcases the performance of the ISL6559 and HIP6601B

chip set. Designed to meet the performance requirements of

AMD’s Hammer Family Desktop microprocessors, the board

allows the user the flexibility to configure the board for

contemporary, as well as future, microprocessor offerings.

The following pages provide a schematic of the board, bill of

materials and layout drawings to support implementation of

this solution.

References

Intersil documents are available on the web at

http://www.intersil.com/

[1] ISL6559 Data Sheet, Intersil Corporation, File No.

FN9084

[2] ISL6601B Data Sheet, Intersil Corporation, File No.

FN9072

[3] ISL6602B Data Sheet, Intersil Corporation, File No.

FN9076

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