#boostconverter

, which gives a nice clean 1A with a small bill of materials. Now you can use USB, DC, or solar to charge your favorite lipoly or liion chip and get 5V output. Maybe we'll make a version that can handle 3.6V LiFePO4 batteries, too? It's easy to set the bq to handle those by changing a single resistor.

We designed this split +12/-12 power supply board based on the TPS65131 (https://www.digikey.com/en/products/detail/texas-instruments/TPS65131RGER/1672464) a few months ago, but it languished while we worked on some other projects. We had an issue where the negative power rail was unstable. Thankfully, we found a thread that suggested slowing down the VNEG feedback loop (https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/628380/tps65131-q1-abnormal-operation-of-tps65131-q1-s-vneg) with a 51k resistor. We hand-soldered that in, and it worked nicely. Then, the other fix was to flip around the trimmers so the turn direction matched the expected behavior. This should be good to book a second prototype, and then it can go into the shop.

- we need -12V to bias the Apple Disk ][ drive control system. It's a combo buck and boost: give it 3~5VDC and give you up to -15V and +15V output. The split supply part is particularly nice because you'll want +-12V or +-15V for analog projects. This standalone power supply breakout has two mini trim pots to help adjust the output voltages on both sides so you can have as little as +/-6V and up to +/-15V. With the 2A internal switches, you'll get a fair amount of current on either rail.

We had a previous version of this 3.3V buck output board with an MCP73831, but now we've replaced it with a BQ25185, which makes it a little more flexible: Vin can be up to 18V, and solar panels will work, too. There's also a power path and 4.5V regulated output. This charger chip can handle LiFePO4, but for that chip, we might swap the buck for a buck-boost or a boost / LDO to get the solid 3.3V output. Coming soon.

Analog Devices introduces the LT8349, a monolithic 2-phase synchronous boost converter designed to improve power delivery in low-voltage, high-power applications. By interleaving the switching action across two phases, this converter effectively reduces current ripple, enabling the use of smaller capacitors and inductors, and enhancing thermal performance.

Conversion Efficiency: Up to 94%

Desk of Ladyada - Solar Boosters, Split Supplies, and a Floppsy rev 💾✨🔋 https://youtu.be/yfdQca-_H4o Floppsy Rev B debugging (floppy pins, power, boot button) & prepping Disk tests. Crafted a split-supply board (-12V throwback to 6.101!) and boosted 5V solar power magic with bq25185 + TPS61023. Also hunting for a modern 5V stepper driver!