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TPS63811: 5V to 5V buck / boost

Part Number: TPS63811
Other Parts Discussed in Thread: TPS55288, TPS63805

Hello,

I want to convert a 5V to a 5V, ok it's a strange idea.

In fact, my problem is : I have a 5V main power supply, bust I don't how is the accuracy, and it is far from my board, and the current needded is around 2.5A.  The main processor on my is powered by a 5V converter that cannot work with a low power supply, it must be >4.5V).

I think it is dangerous to supply my processor module directly with the main 5V, due to the lack of accuracy and the voltage drop in the connectivity and the filtering components.

So I want to rebuild a clean and accuracy 5V from the main 5V power (let's say, 5V +-5%)

In first instance, I think a good way is to put a buck / boost converter to achieve this. So I look at TI buck boost, like the TPS63811 or TPS55288. For example, for the first one, the specs say I can work from 2.2V to 5.5V for input, and generate 1.8V to 5.2V in output. So I expect I can use it for my problem.

Nethertheless, when I want to build a Webench with it, for a input of 4.5V and an output at 5V / 2A, the software say me it is impossible. (if I build it for 3.3V out, it work well, bu I don't need a buck converter)

So my question is : is it really possible to use a buck / boost to build my 5V to 5V converter ?

Thierry