How to power budget my circuit if I don’t have all the information?

I am trying to power budget my circuit schematic to see which battery I should use. How would I power budget my circuit for like the worst possible situation? Kindly send online the product datasheets only and also include the absolute maximum value and the supply current with zero load. How would you go about getting this information the quickest way? I could maybe use the absolute maximum value but it is highly unlikely that my circuit will hit those values.

Thank you for your help in advance.

Hello Cady,

This is a good question, but it's hard to answer without seeing your schematic. Can you attach an image of your design schematic?

The power taken by each component is determined by the voltage across it and the current going through it.
(Sorry if I'm working from absolute basics.)

In the course of your circuit design, you calculate the current required in each branch of the circuit, then add them together to get the total current that will be drawn from the supply.

When using a particular chip, get the datasheets for it from at least two or three different manufacturers, as some give application notes and circuit suggestions which can be very helpful.

As Joe says, post up your circuit and we'll see what practical guidelines we can give you.

How about putting your circuit into a CAD simulator and attaching a virtual ammeter then pushing your circuit to its absolute maximum

Wont that give you the immediate answer ??

To calculate the power Generally you need to look at each component that connects to a power supply rail and determine the current.The total will be the power.

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