At 2.5A output, efficiency of 85% yields 2.5A * 5V / 0.85 = ~14.7W input, and ~2.2W dissipation—exceeding safe limits without active cooling.
Since "npct750" appears to be a specific part number (likely related to a Network Processor, Power Controller, or Telecom module, potentially a variant of a PT/NPT series or a niche industrial component) for which public documentation is scarce, this guide focuses on for this component. npct750 datasheet verified