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LMZM33603: schematic check

Part Number: LMZM33603


Could you help check the LMZM33603 schematic as below and any need to adjust? Vin=24V; Dynamic adjustment Vout = +5V~+12V, Iout (max)=2.52A

The datasheet recommends Separating AGND and DGND, FB pin is connect to AGND?

Thank you

LMZM33603 schematic.pdf

  • Hi,

    The basic component selection looks correct and follows the datasheet recommendation. One thing I'd like to add is that since you are switching between output 5V and 12V, you would need to design the output capacitance for the worse case scenario. In this case it would be 5V which requires a minimum of 66uF. To make sure you are following Table 1 of the datasheet, you should stay between 66uF - 80uF for your output capacitance. 

    As for the dynamic adjustable circuit, I'd suggest reading this app note and adjusting your circuit to the example. 

    The idea here is to have a current DAC that injects current into the feedback pin of the LMZM33603 to adjust the output voltage accordingly.