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Description: The NCP1402 is a 3.3V DC-DC converter. The breakout board will accept voltage inputs between 1 and 3 Volts (such as 1 or 2 AA batteries) and output a constant, low ripple 3.3V output capable of sourcing up to 200 mA. This board is great for supplying power to 3.3V sensors or providing 3.3V from a a single AA battery.

The breakout board includes the necessary peripheral components. The input, output and ground pins are broken out on a 0.1" grid to allow easy access on a breadboard.

Documents:

Replaces: PRT-09216

Comments 21 comments

  • Be sure to check the data sheet. Don’t plan for 200mA from a single AA cell. The max current depends on the input voltage.

  • It would be awesome if Sparkfun made a step-down circuit akin to this step-up and in the same form factor. I know that Sparkfun carries a step down chip, but it’s not the same: https://www.sparkfun.com/products/317

  • I just had an idea. If you cut through the center track on the bottom. And soldering one or more silicon diodes in series between Vin and the via behind the regulator (or the middle pin if you can handle soldering tiny things) should get it to shut off in UVLO situations. It should shut off when CE goes below 0.3 V. So if Vin is a silicon diode drop (estimating 0.6 V) higher, it would shut off when NiMH cells are near-empty around 0.9 V. Similarly 2 NiMH AA would require 2 silicon diodes in series. 0.3 V + 2x0.6 V = 2x0.75 V It’s a bit close to degradation voltage. But maybe you are able to select diodes when buying a big bunch, with higher than average voltage drops.

    Caveat: I don’t have these (yet) so I can’t test. Just a suggestion.

    P.S. If some one can test this for me. As I don’t think I can generate controlable low Vin with the limited equipment that I have.

    • Diode drop to CE pin doesn’t work. The current is in the order of uA, so the voltage drop is much lower than 0,7. Even tried it with a yellow led to make it shut of around 2v. No workie. Neither did a simple voltage divider on Vin (1M+220k). The shutdown threshold was not sharp enough. Going to try to switch it with a true voltage detector.

  • Too bad this doesn’t have an adjustable low voltage cutoff. It looks like it’s capable of way overdischarging a single NiMH cell and would be a lot safer with a cutoff set to around 1.05 volts. There ain’t much energy left in a NiMH if you discharge it below that level, but it does a lot of damage in terms of shortening the life.

  • Does anyone know of a low profile diode that will also suffice for the NCP1402? I have made a test board that works using only 0603 parts for the caps and inductor, but can’t find a smaller diode.

  • It would be really cool if you guys stocked these with the NCP1402SN30T1G and NCP1402SN27T1G for 3.0v and 2.7v output.

  • What is the Quiescent Current?

  • I have one of this breakout and works well, however there is quite a ripple in the output ! Any suggestions about how to get rid of the ripple ? I’m trying to power some audio stuff and is quite noisy ! Thanks

  • I am using one of these but I’m getting an Output Voltage of 4.8V.

    Using 1xNiMH AA battery, 1.3V for power.

    Is this normal?

  • The description for this product indicates that the input voltage is 1 to 3 Volts, however the data sheet for the NCP1402 indicates that it will accept up to 6Volts. Is there some reason that this unit is more limited than the base part?

    • A step-up breakout must obey the property Vin < Vout, so Vin must be less than 3.3V. The 5V version of this board can accept a larger input voltage only because the output voltage is higher.

      • What would happen if you did plug in a higher voltage?

        I bought a bunch of these and plugged some into a power supply and got the input voltage up to almost 9V before the board fried. The output voltage went up, of course.

        On the other hand, a couple boards seem to have gone wonky when they got voltages around 4V. I’m not totally sure that it was the 4V that screwed these boards up or if something else happened…. any ideas?

  • Hi Im working on a board that would like to use this step up converter but it would be my first SMD project. Is there any chance you guys can post the component ID’s for all the passives on this board so i can use the same ones on my board?

    • If you read the datasheet, you’ll find a list of suggested components and part numbers. You should be able to source these from Digi-Key, Mouser, Newark, etc.

      • I’m trying to do the same thing and am having a hard time finding the inductor listed in the datasheet. Anyone have a link to where this part is available? I haven’t been able to find an exact equivalent part at any of the major suppliers either.

      • Hi mike Ive managed to find every component but the inductor. none of the suppliers that i have looked into stocked a 47uH inductor with a DCR of under an ohm as well. Im sorry for bothering you about this so much as well.

        Thanks, Roy Cohen

      • Ahh thanks for the help :)


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