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Description: The NCP1402 is a 5V DC-DC converter. This breakout board will accept voltage inputs between 1 and 4 Volts and output a constant, low ripple 5V output capable of sourcing up to 200 mA. This board is great for supplying power to 5V sensors on a 3.3V board, or providing 5V from a AA battery.

The breakout board includes all of 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.


Replaces: PRT-08999

Comments 22 comments

  • I fail to understand why Sparkfun never seems to breakout the shutdown pin on any of their breakout boards! Why do I have to cut a trace and solder a jumper wire on and SMD part to get it?

    • That’s a fair complaint, sorry about that! We do try to design our products to walk the line between requiring minimum effort to just work out of the (red) box, and being completely spread out and hackable. We don’t always get the line right. I have personally have run into identical situations to yours, so I feel your pain! We are trying to be better about breaking out every useful pin while also providing e.g. pullup resistors so that you don’t necessarily have to drive that pin to get the circuit to work. We’ll see if we can get that pin broken out on a future revision. Thanks for your feedback!


    Come on SF, throw us a bone. Give us something we can put between a 3.7v 2Ah LiPo cell and our Raspberry PIs, beaglebones, etc. I’m willing to pay for it, it just doesn’t exist.

  • Is it possible to use two of this board in parallel to get twice the max output power?

  • I’m just wondering if there is way to increase the mA beyond 200 to say 500 mA?

    • Not with this board. Infact, you might get 200mA only if Vin=2V and Vout=3V. I recommend planning for lower current (~150mA).

  • The schematic for this and the 3.3V version are identical. What actually differentiates the output voltage? I have the 5V version and was wondering what I’d have to change on it to get it to output 3.3V?

  • What size is it? (mm)

    • Since i have mine sitting here, its just shy of the 4mm mark :)

    • It is 12.7mm (0.5") by 16.51mm (0.65").
      The height is a bit more difficult - the tallest component is the inductor, but I don’t know which one that is to check a datasheet on, but since the package outline on the board is about 6mm on the long side and the photo is fairly orthographic, after some pixel measuring I’d say it’s under 2.5mm tall. Add to that the PCB’s thickness itself, do some arbitrary upward rounding, and assume that’s 4mm maximum.

  • Can any one please tell me whether i can connect two of these boards in series to get a 10V output from 2 3.7V batteries? Actually my work is to measure the individual voltage difference of each Li-Po cell with a ADC. I am using a microchip adc which uses the VDD as Vref. So i need a voltage higher than the cell to convert it. Therefore i use this converter to step up the voltage to 5V. It works completely fine when i connect two cells seperately. But when i connect it in series and connect the ADC to output the lower boost converter produces an output of 8V instead of 5V. Guys pls help me.

    • I did this recently, to test the voltage drain rates of AA cells vs lipo cells with my teensy, and used a software fix. just connect the battery positive to your adc line, and in software multiply the reading by ADC-resolution/5V, in my case a 12 bit ADC i use 1024/5V. reading is typically within 0.05V of my DMM.

  • The efficiency of this thing is no where near the datasheet efficiency.

    Running it on 3 AA batteries putting out around 4.5 volts, this thing increased the current used by my teensy from 10ma to 70ma (vs running the teensy directly on the 4.5v).

    I wanted to use this thing in order to get more life out of my batteries, but drawing an extra 60ma completely negates any possible benefit.

    • You obviously did not read the other posts. You can not run this at 4.5 volts. It will not regulate and will draw more current.

  • What happens if the input voltage is higher than 4 Volts? It would be really nice to use this with a single cell LiPo or Li Ion battery. But both these battery types have a voltage higher than 4 Volts when fully charged.

    It would be nice to know if a 4.2V Lithium rechargable would work with this.

    I see a single cell LiPo listed in the “Related Products”. I think listing a LiPo implies it would work with this regulator.

    • According to the posts on the Sparkfun NCP1400 step up board, AND the datasheet, the IC has a max input voltage of 5.5V, so it will work just fine with a fully charged 4.2V lipo or li-ion cell.

    • The previous posts are incorrect. They are correct in that the I/O pins are rated for 5.5V (or 6V, in the “Absolute Maximum” section, but it’s generally best to limit it to normal operating values; ignore the ‘absolute maximum’ section on most datasheets if you want to play it safe). However, it will not function properly when the input voltage is higher than 4 Volts.

      Check out the schematic: The output is connected to the input through an inductor and a diode. There is no way for the device to regulate the output voltage down; it’s only passed through the forward-biased diode. That would allow you to use about 5.5V as an input to get out 5.0V, but the part will not be actively “regulating”; sufficiently low output current would cause this to rise depending on the diode’s behavior.

      Over 4V, you’re not using the regulator as intended. You won’t damage this device, but your noise levels and load regulation won’t be as good. That’s probably OK; Lithium batteries only have a brief period at their fully charged state during which they’re over 4V.

      • noise levels? 10 microfarad capacitor :)

      • Would this arrangement (Lipo/ion straight to boost converter) endanger the cell? Or is the under voltage protection on the cell sufficient to prevent dangerous discharge? Apologies for going slightly off topic.

        Thanks, Andrew

    • Just have a look at the datasheet, up to 6V is allowed. I do not find any information what will happen if the input voltage is higher than the output voltage but 4.2V should be no problem.

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