A negative buck converter can be done using a boost converter. For example I have put a rough schematic on how to do this with the TPS55340 in the attached. There is also a description of this topology in the article linked below.
TPS55340 negative…
Part Number: AM62A7 Tool/software: Hello TI team,
We met issue about MIPI CSI Virtual Chancel preview on TI platform.
Our environment is as following:
TI SDK BSP version: V09_00_02
Linux version: 6.1.80
Device tree overlay setting…
Other Parts Discussed in Thread: TPS40210 , TPS55340 , PMP
I'm using more or less the same design(see above) as shown in http://www.ti.com/tool/pmp5657.1 (TPS40210, 12V Sepic) without "optional undervoltage lockout".
I tried with input voltage up…