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EK-TM4C123GXL Launchpad regulator

James Randjelovic
Prodigy 115 points

Hi guys,

Hope this is the right place to ask this. I'm wondering what the easiest way is to bypass the linear regulator on VBUS. I want to supply a more efficient 3.3V to the Launchpad through my own booster pack. From the attached picture it looks like I can just cut the tracks leading to the 3.3V rail and supply 3.3V to J1.01. Is this understanding correct? Also what is H22 in this diagram?

  • 0
    TI__Guru**** 244400 points

    Hello James,

    You can remove the Short between H24 and H25, just below the U8 regulator and then use H24 to power the TM4C123 (U1)

    Regards

    Amit

  • 0
    Guru 117855 points

    Perhaps some added attention to the abandoned U8 Reg. may prove helpful.  Don't know nor use that device - but it may suffer upon "power-up" if it's, "completely unloaded" (to include any output C).  We've noted oscillation from certain, linear Regs (upon start-up) - when their outputs simply float.  

    Breaking the input connection to +VBus should solve.  

    Your "more efficient" (i.e. assumed switcher) supply must insure good, solid (we prefer multiple) ground path connections to your MCU board for best results...