Guru
Joined: 05/10/2019
Location: United KingdomPosts: 8941
| Posted: 07:18am 03 Jun 2026 |
I think the 15V input voltage limit of the S09 is only fixed by the input capacitor rating. The chip (assuming it meets the spec) is rated for up to 24V input. I suspect that if you remove the capacitor between the VIN- and VIN+ pins and replace it with a 10uF or 22uF cap (tantalum would be nice) with a higher voltage rating then you are in business. The EN input is also rated at up to 24V so no changes there. You need the cap as close to the chip as you can get it really.
The SW pin of the mosfet is actually rated up to 30V so the spec sheet allows an absolute max of 26V on VIN+ and EN.