Step-Up-Switch-Regulator 6.5 to 9V // 1.3 A

Hi!:smiley:

Im building an telemetry system based on Arduino Nano for an RC-Car (DC). I would like to power the Arduino with the batterie of the car.

Battery full charged: 8.5V------ Discharged: 6.3-6.5V

For that ive thought to use an Step-up-Schwitch, but im getting lost.

I bought a MC34063A, but to get this boost, I need an capacitor with more than 12.000uF … :o (attached data)

I have not very much space to install the elements (Sensors, board, RFM12-Modul,etc.) and a capacitor with this value is huge!! (maybe you can tell me some little model)

Now im looking for LM2621 but I dont find a “circuit designer” to calculate the element values i need to get it work how I want.

Other option Im thinking, is just powering the Nano with 3 Button cells in serie (maybe is better, if I think at the inductive currents of the motor and the current value (peaks of more than 150A)).

So im just a beginner, so excuse me if im asking stupid things :cold_sweat:
I hope I was able to explain myself.

Thanks in advance, hope you can give me some hints.

:slight_smile:

MC34063A design tool.pdf (97.5 KB)

read again.. 12000 uH

You will also find them ready built

Building a boost regulator is not a job for a beginner. It needs a PCB with a good layout, do yourself a favor, buy one.

Im guessing the same...

Some modell-tipp for my specifications??

1) Why do you need 1.3A? If you're actually pulling 1.3A through the Arduino, the regulator couldn't handle it. You talk like you're just powering the Arduino though, which uses far less power. Do you have other high current stuff connected to it?

2) Why do you need to step up the voltage to 9v if you're powering a 5v Arduino?

  1. Why do you need 1.3A? If you’re actually pulling 1.3A through the Arduino, the regulator couldn’t handle it. You talk like you’re just powering the Arduino though, which uses far less power. Do you have other high current stuff connected to it?

To the Arduino are connected, LM35 temp-sensor, RFM12, Hall-Effekt-Sensor, etc… Ive read here in the specs, that powering Arduino with a battery the max current it could need is 1.2 A.

  1. Why do you need to step up the voltage to 9v if you’re powering a 5v Arduino?

If powering with Vin and GND ive read you need 7-12V to have a stable funtionality.

But like I said before, this are just my thoughts and maybe Im wrong.

Thx

I don't know where you have the 1.2A figure from, but your Arduino and sensors will not eat any more than maybe 200 mA - tops!

Use a ready-built step-down unit for 5V output instead.

Some options found on eBay:

http://www.ebay.com/itm/281677889336

http://www.ebay.com/itm/271855073823

http://www.ebay.com/itm/200998657191

I have tried all modules, and they work well.

// Per.