Powering STM32H745 with bypass

vnaik792014 · ‎2026-01-21

Just to confirm, did anyone else got success by using:

for STM32H745, to safely power the uC with just LDO no SMPS ?

TDK · ‎2026-01-21

All of the power schemes given in the reference manual are functional and can be used to power the chip, including the one you show.

The picture you showed is Bypass mode, not powered from the LDO. This means you have to generate the correct VCAP voltage externally. This works but is not common.

If you want the standard LDO configuration, it can be seen on the top left.

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sndafrei · ‎2026-01-21

I use also this one @TDK marked in red.

I attached two pictures how I connect the uC which is in a series product and work very well.

Andrew Neil · ‎2026-01-22

In addition to the Datasheet and Reference Manual (already mentioned by @TDK ), see also:

Application note AN4938, "Getting started with STM32H74xI/G and STM32H75xI/G MCU hardware development"

There's a whole section on power supplies:

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.