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TLV61046A: Calculating max. ouptut current

Part Number: TLV61046A

I was wondering if there is a way to calculate the maximum output current for a given output voltage.

When using WEBBENCH I get a failure when demanding a current to high. So I used trial&error to figure out that WEBBENCH is okay with 45 mA @ 27 V from an 3.6...4.2 input. But using the info from the datasheet I fail to get a similar value.

min. Switching Current is 680 mA, so at 3.6 V that are 2.45 W, times 80 % efficiency and divided by 27 V that gives me 72 mA. Where is my mistake?