5V and 3.3V Hot Swap Controller

This reference design implements a hot swap controller design within a Power Manager II mixed-signal PLD. The design manages 5V and 3.3V supply rails to limit inrush current to a user-defined level. It also initiates a shut-down if either supply exhibits a short-circuit. By sensing the voltage across the MOSFET and limiting the inrush current, the design operates the transistors in the Safe Operation Area (SOA).

Features

• 5V and 3.3V hot-swap controller
  • Operate MOSFETs in Safe Operation Area (SOA)
  • Short circuit protection
  • Protection against over current faults during operation
• Programmable SOA and over current levels for both 5V and 3.3V
• Customize the design to suit most MOSFETs
• Initial contact de-bounce period programmable from 32us to 2 seconds

download design documentation (RD1057)

download source code

* May work in other devices as well.

Note: The performance and design sizes shown above are estimates only. The actual results may vary depending upon the chosen parameters, timing constraints, and device implementation. See the design's documentation for details. All coding and design work was done on a PC platform unless noted otherwise.