Ancestors

Toot

Written by jaseg on 2025-01-15 at 18:00

is eight power rails too much?

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Descendants

Written by jaseg on 2025-01-15 at 18:16

I guess I could probably merge a couple of the design’s five analog supplies, but then, a really nice, brand-name LDO is less than a dollar so I’m not going to bother figuring out which.

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Written by Andrew Zonenberg on 2025-01-15 at 18:01

@jaseg For?

I mean, if you ask me the answer is "I use a STM32L431 in 100-BGA as a PMIC on an upcoming design because I ran out of GPIOs on the 48-QFN to drive all the EN/PGOOD lines"

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Written by Andrew Zonenberg on 2025-01-15 at 18:11

@jaseg oh, and the board in question is the logic board for a 16 channel high bit depth, low sample rate scope.

Meant, in part, for validating sequencing, ramp times, and performance of devices with a massive number of power domains.

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Written by Graham Sutherland / Polynomial on 2025-01-15 at 18:02

@jaseg "too much" is when you end up needing to add a power rail sequencing IC to bring up the aux rails for the MCU/FPGA that you had to add to the board to handle the complicated bringup sequence for your main rails

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