Hello..
I have an arduino uno r3, many say that the required voltage is 12 volts, when i use a 12.6 volt 2000 mAH battery the regulator ic is too hot..
please give the solution my friend.. 
Don't power anything from the Arduino's 5V pin. The Arduino is noy a power supply.
If you need 5V, use a converter to bring down your 12.6V to 5V for use with the peripherals.
i didn't use the 5v arduino pin, but the regulator ic is still too hot.
such as overvoltage
but if using a 9 volt battery the regulator ic is not too hot
Is nothing connected to the Arduino except for the power supply?
Yes, I'm using a 12.6 volt 2000mAH battery
If nothing is connected (no leds, no LCD, no sensors, no ...), it should not run hot; it might get warm. I don't have a 12V supply to test.
ok..
thanks 
Where did you hear that nonsense.
The board runs on 5volt, so it's best to power it with 5volt.
An easy way to do that is to connect a 5volt cellphone charger to the USB socket.
It is possible to power an Uno with 7-12volt on the DC socket (or V-in).
But the built-in regulator has to drop it to 5volt, converting the difference in heat.
A higher difference is of course more heat.
At 12volt (7volt difference) the regulator is already heating up from just powering the Uno.
Adding sensors/LEDs, and heat could become a problem, causing the Uno to periodically reset.
Leo..
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Regrettably the Arduino site itself contains that same nonsense.
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Arduino power jack can take 7V to 12V and give 5V while dumping the rest into heat. It has to dump at least 2V to get stable output except maybe 1.5V can do (6.5 instead of 7).
You can use an adjustable (has a screw) buck converter to make 1A 12V into >2A 5V and if it's not stable enough, convert to 5.5V and use a 5.1V Zener diode to dump all over 5V to ground like the 7805 regulator but not as instrument flat as the 7805 which the AVR is fine with any of these but other devices may need cleaner ripple free power.
Try 12V ---> Buck converter ----> 5V and ground pins on Aduino to bypass the socket VIN that goes through the 7805 that needs 6.5 or 7V minimum to make 5V. The converter takes care of that, it connects to the board 5V the chip runs off.
There is also max total current for the AVR IO pins that includes output and input currents, no they don't balance they add.
IIRC the Uno rates 200mA total max which should be sustained. Need or want more, get FETs or drivers.
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