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LMZ10504: Use of this component for a stable voltage for a MCU/FPGA board.

user4919034
Prodigy 10 points
Part Number: LMZ10504

A board with MCU and FPGA, this voltage regulator provide the main 3.3V board supply from an input 5V supply.
Now I have to use the same board in an application in which the input supply is 3.3V, I would keep all the PCB design, changing only the BOM (in case), so in this condition: Vin= 3.3V input , Vout= 3.24 V, ( Rfbt=100K; Rfbb = 33K), max current absorption = 1A.
My question is : could this component working fine in this very low drop ? the internal switching could work at 99% of duty cycle ?
I tried the real condition configuration succesfully (Vout match 3.24V). After I also tried that overloading to 2A and the output voltage just drop a little (Vout = 3.15V).
It is reliable the functionalities in our real condition ?

  • 0
    TI__Guru*** 144230 points

    Hi User,

    As stated in the D/S on page 5, this device supports 100% duty cycle operation.  Based on your measurements, it seems that the device has enough headroom to output 3.24V.

    You will need to make sure that the output voltage meets the minimum voltage required by your load in your exact system.  The output voltage will be further reduced by: your input voltage tolerance and any IR drops from the input source to the LMZ10504; operating at higher temperatures, which increases the resistances and dropout; any IR drop between the LMZ10504's output and your load.