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LDOLDOs if output voltage is greater than output

Question asked by joan vicient on Feb 10, 2017
Latest reply on Feb 10, 2017 by igorpadykov



I'm working on a custom board with an iMX6 Solo processor.

VDDARM_IN, and VDDSOC_IN are powered at 1.2V by a DCDC with less than 5% Vpp ripple.


My doubt is about the difference between bypassing LDOs or setting them with an output voltage greater than output.


As Igor said:

> but since in your case output voltage is set greater than input,

> LDO transistor is fully "closed"

in LDO turning from 0x1F to 0x1E cause i.MX6DL hang 


I understand that the "power" part of LDOs work in exactly same way and the only difference is that when bypassing the control/analog part of LDO is disabled. Am I wrong?


Which LDOs configuration do you recommend us in case we want to use Arm at 972MHz and GPU as well?


Thanks in advance!