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powering the LM4F120H5QR

Harry
Expert 2920 points
Other Parts Discussed in Thread: TPS63020, TPS63001

I wish to use TI's TPS63020 as the voltage regulator in a portable circuit powered by a LIPO battery (single cell 2.5V-4.2V) to power up the LM4F120H5QR .

(I assume the fuly charged LIPO has 4.2 and tolarable discharge is 2.5V)

At voltages above the 3.4 the this IC works in Buck mode 

but when the voltage of the battery is lesser than 3.4 it will start to boost up.

Because I want to save maximum amount of power ( major requirement of my cct) I wouldn't  want to use another LDR before the ARM M and would like to straightaway feed in the constant  adjusted 3.3V output  of this IC to the ARM M.

Can I do this? Would this cause any serious issue?

thank you so much for all of your replies.

  • 0
    TI__Genius 17225 points

    You solution should be acceptable for power the LM4F120H5QR.

    Be aware that the Stellaris LM4F120 LaunchPad has a supply voltage supervisor which monitors the 5V input and asserts reset to the LM4F120 when 5V is below 4.35 volts.  You will have to disable this supply voltage supervisor if you are supplying a Stellaris LaunchPad with only 3.3V and not 5V.  The simplest method is to remove either U4 or D2 in the top left corner of the board.

    Dexter

  • 0 in reply to Stellaris Dexter
    Expert 2920 points

    thank you so much dexter but i am not using the stellaris Launchpad in this case.

    I am trying to make my own PCB 

    WOuld you have any idea what regulators I should use?

  • 0 in reply to Harry
    TI__Genius 17225 points

    I do not have specific recommendations.  The WebBench designer on the ti.com homepage is a useful tool that will allow you to input your design needs and narrow your search.

    The TPS63020 does appear at a very quick look to be acceptable.  The TPS63001 may also be an option.  I believe there are many parts that may work.

    Dexter