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  Ultrathin Dual 2.5A or Single 5A ОјModule Regulator Fits on the Backside of PCBs, Allowing Space on the Topside for Digital ICs &mdash DN546
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  Ultrathin Dual 2.5A or Single 5A ВµModule Regulator Fits on the
  Backside of PCBs, Allowing Space on the Topside for Digital ICs
  Design Note 546
  Sam Young, Afshin Odabaee
  Introduction
  The top side of a typical system board, such as a
  PCIe card, is densely populated with FPGAs/ASICs/
  microprocessors, transceivers, connectors, memory
  ICs and DC/DC regulators, while the backside is often
  unused. This is a common side effect of the significant
  difference in top vs back side height restrictions,
  where board specifications may allow topside devices
  to reach a few centimeters, but restrict backside
  packages to less than 2.3mm. What if functions
  usually found on the topside, such as DC/DC regulator
  circuits could be thinner and moved to the bottom?
  Real estate on top would be available for expanding
  memory or enhancing the board/given the additional
  top side space. Flexible Dual Supply in a Simple …

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• Power Management > Switching Regulator > Step-Down (Buck) Regulators > Multiple Output Buck
• µModule Solutions > µModule Regulators > µModule Buck Regulators