Tool/software:
I am considering using the LMZM33603 power module in my design. My board has an input supply range of 5–36 V, and I need to regulate it down to 5 V output. Unfortunately, I do not have enough PCB space to implement an isolated converter, so I am planning to use the LMZM33603.
After reviewing the datasheet, I would like to clarify a few technical points:
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5 V Input to 5 V Output Operation
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From the datasheet, I understand that if the input voltage is 5 V, it is still possible to regulate and obtain 5 V at the output. Is this correct, and are there any limitations or considerations in this operating condition?
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Output Filtering Recommendations
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Since I cannot isolate the power stage, I would like to improve the output quality. Would you recommend adding a π-filter (LC filter) at the output of the module to further reduce ripple and noise? Alternatively, do you have other layout or filtering recommendations for best output performance?
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Grounding (AGND vs PGND)
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I noticed that the module provides analog ground (AGND) and power ground (PGND) pins, which are internally connected. Could you explain the reason for separating them at the pin level?
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When designing the PCB layout, do you recommend keeping these ground planes separated and then joining them at a single point, or should they be merged into a common ground plane?
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Would separating them incorrectly cause any performance issues? Do you have a reference layout example that demonstrates the best practice for grounding in this module?
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Thank you in advance for your support.
