π¬ Adjustable Boost Converter with Pass-Through
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I just now posted Version 3.
Changes from Version 2:
- Change to using the same type of shielded inductor that my other boost projects are using.
- Eliminated unnecessary header pins, and added a ground header pin.
- Changed the silkscreen on the MCP1640 land pattern to mitigate against potential for solder bridging.
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I've tested the board, and it works.
Please purchase your PCB's for this project from the following link: https://pcbs.io/share/zyLW7
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Here is a photo of the assembled PCB, taken next to a quarter for scale:
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This project is now finished. :smile:
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Setting R1=680K gives a voltage output of 2.674v, which is great for charging 2.7v supercaps.
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I just now revised the board to expose the Enable pin, so now you can do a pass-through if you wish. I also made it more compact and gave it a ground-plane on the back. Enjoy!
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i received the upgraded PCB and assembled it. It tests out correctly. The project photo now shows the newest board. Project completed. :)
For 3.3v output, use R1=976 ohms and R2=562 ohms, as per the datasheet.
BTW, the same PCB and circuit can also be used with the MCP1640T instead of the MCP1640C if so desired. In that case, the ENABLE pin acts like an ON/OFF switch, instead of an ON/Pass-through switch.
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Just little tip from me :) Use thermal relief instead of direct polygon connection.
It is much more useful in such cases.@Koresh said in π¬ Adjustable Boost Converter with Pass-Through:
Just little tip from me :) Use thermal relief instead of direct polygon connection.
It is much more useful in such cases.Where do I put that exactly?
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@Koresh said in π¬ Adjustable Boost Converter with Pass-Through:
Just little tip from me :) Use thermal relief instead of direct polygon connection.
It is much more useful in such cases.Where do I put that exactly?
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Sorry if I'm being dense, but how are the thermal reliefs better? What's their advantage?
@NeverDie It is much easier to solder the wire to pads with relief connection than the wire to directly connected pads. Your soldering point even can be unreliable if your pad is directly connected to very huge polygon and your soldering iron don't have enough power.
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@NeverDie I have got MCP1640CT-I/CHY in SOT-23 (BX5V marking on the chip)
Can these be used for this project please?I also have some 8 pins ones, but there are not suitable
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@openhardware-io
I am having issues can someone help
I am getting output voltage same as input , i removed enable pin supply still i was getting output voltage same as input what might be the issue? -
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