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Part Number: LM43601
I have made a -5V inverter design with LM43601PWPR IC. But in the design, 27uH inductor and 150uF capacitor have a big footprint. I have successfully got -5V but this design conquers too much space on my PCB. How can I select the smaller inductor and capacitor components?
Or do you refer any other design converting 7.4V to -5V with 0.5A with less than 300mm2 place on the board and less components? But main IC should be SOIC or other related packages, not as QFN type.
I used the Webench design using your parameters. The example design uses a 22uH inductor and 56uF output bulk capacitor. The balanced design shows 240 mm2, but you can optimize your design depending on your flexibility on specs.
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In reply to Ethan T:
Could you share BOM file and simulation export?
In reply to AE104:
For example, can I use the Digikey part no: 283-4591-1-ND inductor? It has a little bigger DC resistance value than the design.
Here is a link to the design. You can export the BOM and data their.
I believe that inductor is okay. Higher DCR means more loss and smaller size means high temperature rise for the same power dissipation. But at 0.5A, I do not believe thermals should be issue operating at room temperature.
Still inductor is big for my case. Do you suggest any design without inductor?
An inductor is required to use this power topology. I suggest you going to this webench link:
Here you can enter your parameters and customize your design as you like. You can select "small footprint" in the design considerations. The tool will suggest a couple of solutions.
Hopes this helps,
Thank you Ethan!
I did a new design by selecting less output current in WeBench, Thank you!
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