How to build a 0.95V, 40A power supply for an FPGA
Maxim’s abstract for the note reads; “This reference design provides a power-supply circuit with a 10.8V to 13.2V input voltage, 0.95V output voltage, and 40A output current using the MAX15301 InTune point-of-load (PoL) controller. The circuit was developed to power a VCCINT rail on a Xilinx Kintex UltraScale FPGA, but it is also suitable for similar applications such as VCC1V8, VADJ_1V8, and VCC1V2 rails of Xilinx Virtex Ultrascale FPGAs. Included in this reference design are a schematic, applications information, test data, and a bill of materials.”
Figure 1 The power supply/regulator schematic; a detailed version is here.
The design yields a regulator with the following specifications;
Input voltage: 10.8V to 13.2V
Output voltage: 0.95V
Output current: 40A
Output-voltage ripple: 15 mV
Switching frequency: 400 kHz
Efficiency: 89% with VIN = 12V at 20A
Figure 2 Transient response.
Accuracy achieved is measured as 0.9451V at no-load (0A) to 0.9407V at 28A (0.52 and 0.98% eroor, respectively, and transient response is measured at “soar” and “droop” on the ouptut in response to a 25 to 75% load step, of 29 and 31 mV, respectively.
Find the note at; www.maximintegrated.com/en/app-notes/index.mvp/id/6021
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