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Vccaux regulator

Hi, I need someone more experinced to confirm me if the TPS54610 I have choosen for the 2.5V voltage supply of my Spartan3 will handle reverse current (that arises from using 3.3V signals on 2.5V dedicated pins like CCLK, TDI, TMS...). One the schematic of a Spartan3 evaluation board I saw an LM3475MF for this supply and this also should work without the need of a shunt Rpar resistor to avoid reverse current from entering the regulator. Please advice me on the TSP54610. Thanks, Marco

Reply to
Marco
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Commonly, switching regulators described as "synchronous" will both source and sink current at their outputs.

The data sheet says (in reference to high output voltages): "The TPS54610 is capable of sinking current continuously until the output reaches the regulation set-point."

I've never used a switcher for VCCAUX though, only VCCINT.

Note that linear (i.e. series pass) regulators won't be damaged by output voltages higher than the setpoint, however the output voltage will not be controlled by the regulator.

Regards, Allan

Reply to
Allan Herriman

Thanks, so I could use the TPS54610 without the need for the shunt Rpar resistor, right? Marco

Reply to
Marco

Yes.

Allan.

Reply to
Allan Herriman

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