1
\$\begingroup\$

I would like to build simple and small power supply for my projects with microcontrollers. This supply should be powered by two Ni-MH batteries and output should be 5V (maximum current 500mA).

I know there are plenty of them on the Intenet (MintyBoost from Adafruit and cheap ones from China on eBay) but I want to build one by myself.

The LTC3400 looks very good but not cheap. Do you know any other step-up converter (Vin 1.8V and less, output current 500mA and more)? By cheap, I mean circa $1.

\$\endgroup\$
  • 1
    \$\begingroup\$ There you go; LM2623 for starters. Good luck soldering :) Also, click here for more.. \$\endgroup\$ – abdullah kahraman Feb 13 '13 at 17:53
  • \$\begingroup\$ Microchip has some good stuff in that voltage range too. \$\endgroup\$ – Olin Lathrop Feb 13 '13 at 20:57
1
\$\begingroup\$

Olin's right about Microchip doing some nice switching regulators - I use the MCP1603 parts quite regularly. However these are buck regulators and don't have a 5V fixed option anyway. I just had a quick look on Farnell and didn't notice any MC parts that fit for this requirement. It may be worth a look on their website though.

The cheapest 5V boost regulator I am aware of that can work down below 1.8V at 500mA is the NCP1450 from ON Semi. It's £0.63 in qty 1, can source up to 1A, and can startup with low as 0.8V with no load. It comes in a nice and small 5-pin SOT-25 type package.
I haven't used it, but I saved it whilst searching for another regulator as it looked like a nice part. ON Semi make a lot of decent cheap parts in this category.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.