LTC1929, PCI-bus powered, dual-input PolyPhase power supply

Circuit shows LTC1929 PCI-bus powered, dual-input PolyPhase power supply. The currents available from a PCI connector are limited to 2A for the 5V supply and 1A for the 12V supply. In the example shown here, the load can be as high as 6A or 16.8W at 2.8V