Electronic – Choice of buck-boost converter

buck-boostdc/dc converter

I have a Li-Po battery which has a discharge voltage range of (2.5-4.2)V and I want a regulator which is able to convert this voltage to 3.3V. I was told to use a buck boost converter. I have found one which is a buck boost converter and the other a buck converter. Reading the descriptions of both, I think both will work but I would like to ask for your opinions or if you have any other recommendations of components that'll work. Here below are the datasheets of each component:

Best Answer

The maximum output voltage of a buck converter is slightly lower than the input voltage. Therefore if you use the buck design, you won't get 3.3 V output when your battery voltage drops below 3.4 V or so.

This behavior isn't really explicitly mentioned in the datasheet (except where they call the chip a "step-down" converter), because it's such a fundamental limitation of buck converters that people using them are expected to know about it.

There is one section that does at least allude to the limitation:

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