💬 3.3v Boost Converter with Pass-Through

[openhardware.io]

https://www.openhardware.io/view/285/33v-Boost-Converter-with-Pass-Through

[NeverDie]

Last night I posted Version 3, which updates the silkscreen to 1. show PCB component values to make for faster/easier assembly, and 2. use a larger font for the pin labels to improve legibility.

[NeverDie]

I just now posted Version 4, which redesigns the board after I realilzed there's reason to disallow header access to the SW pin on the chip.

[NeverDie]

I just now posted Version 5, which increased the capacitor value from 10uF to 22uF in order to reduce voltage ripple. See datasheet.

[NeverDie]

Just now posted Version 6.

Changes from Version 5:

1. Changed to using same inductor and capacitors that I'm using in my other project: https://forum.mysensors.org/topic/5280/3-3v-buck-boost-dc-dc-converter
2. Changed top silk screen to more clearly identify Pin 1 on the LTC3525D-3.3 chip and also provide extra clearance to prevent the silk screen from potentially causing the pads to bridge during soldering.

[NeverDie]

This project now finished: I've assembleed the pcb and it works.

[rozpruwacz]

Hi, I just came across this project and I like the idea of pass trough very much I have a question, why did You use the LTC3525D part instead of MCP1640C which You already used in other boost converter projects ? MCP1640C is 5 times cheaper than LTC3525D and they are quite similar.

[NeverDie]

@rozpruwacz
Yes. Good catch.

[NeverDie]

@rozpruwacz said in 3.3v Boost Converter with Pass-Through:

Hi, I just came across this project and I like the idea of pass trough very much I have a question, why did You use the LTC3525D part instead of MCP1640C which You already used in other boost converter projects ? MCP1640C is 5 times cheaper than LTC3525D and they are quite similar.

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.
https://www.openhardware.io/view/279
Enjoy!