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I have a task of creating a boost DC-DC converter that can convert 3-4 V input into 12-16 V output with 100 W power and high efficiency.

There is nothing similar that I could find on the internet. Could someone give pointers to such designs or ICs?

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    \$\begingroup\$ (Ouch. Forget diodes.) \$\endgroup\$
    – greybeard
    Mar 7 at 17:54
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    \$\begingroup\$ Have you tried TI webench? \$\endgroup\$
    – winny
    Mar 7 at 18:01
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    \$\begingroup\$ You must first define what is the limit between efficient and inefficient. Then search for boost circuits which are above the limit. \$\endgroup\$
    – Justme
    Mar 7 at 18:05
  • \$\begingroup\$ That's going to have a nice fat current spike on the boost mosfet. \$\endgroup\$
    – Barleyman
    Mar 7 at 18:13
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    \$\begingroup\$ If this is a hobby / low-budget thing, maybe look through the vast number of USB power bank chips available, there might be some supporting 1S Lithium input (which would be around the 3-4V range) and they would be able to output 12,15,20V for USB-C PD. \$\endgroup\$
    – Manawyrm
    Mar 8 at 8:57

2 Answers 2

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I have used one of my ready-made free templates with a 200-kHz interleaved boost converter operated in CM and I can deliver 100 W from a 3-V source. The inductor current peaks to 19 A and the rms current in the output capacitor is 8.3 A:

enter image description here

It's obviously not a design but rather a quick sim to show that, on the computer, you could deliver 100 W from the 3-V cell: there is obviously more to explore on the subject : )

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An update: TI Workbench didn't help as it couldn't find anything suiting my parameters. Also I'm not proficient enough to use the information in the answer by Verbal Kint.

However I was able to partially solve this task by using SC8802 DC-DC converter chip, which also has a nice feature of working bi-directionally, i.e. in addition to boosting the battery voltage it also can charge the battery from an external DC source.

I used SC8802 along with 4 pcs of BSC015NE2LS5IATMA1 147A MOSFETS, as well as 7443642200 30A inductor. I was able to get 60W power out of a single Li-Ion cell. The current draw from the cell was almost 20A and the efficiency was about 86-89%.

I guess I can tune this circuit to achieve higher power. However it looks to me that it may be quite hard to achieve higher efficiency, if at all possible.

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