TPS75003 Spartan-3(E) Voltage Regulator

The TPS75003 is a triple voltage regulator for Xilinx Spartan-3(E) FPGAs. Farnell are now supplying these in low quantities.

The device has some quite specific external component requirements. As most of the components listed on the datasheet and appnotes seem to be only available in the US, this page lists suitable components available in the UK, via Farnell.

This board has been built and tested, it works OK so far. I've powered 16 Spartan-3E 500s using one of these boards (although not under heavy load).

• Circuit & PCB
• Component List

Note: One aspect of Buck controllers is the audible noise generated by the inductors. The switching frequencies used by the TPS75003 are well within the audible range. Depending on the load and components used, using this device can result in quite a (audibly) noisey regulator.

• Circuit & PCB

The photo below shows a simple regulator board that uses a TPS75003.

The schematic for the board is shown below. A PDF version can be downloaded using the link below.

Board Schematic

The two images below show the top (red) and bottom (blue) layers of the PCB. The board also include two current sensors (not shown in the schematic above) these are not required for the TPS75003 to operate.

The PCB and Schematic in Eagle format can downloaded using the link below.

Eagle Files (Board and Schematic)

• Component List

Below is a list of the parts required to build a triple regulator for a Spartan-3 FPGA. All the parts are available from Farnell.