Does the LT3029 regulator give out 9v 500mA without external circuitry needed for it?... I'm planning to use it for my arduino mega... I really haven't used that regulator before ...My main power source for my whole circuit is 12V 2Amps, that's really big for the microcontroller so ill be using a regulator to power it up. I also need suggestions on what regulator should be fit for arduino mega...please help me ...thanks
You say LT3069 in the title, but LT3029 in the text. I assume you mean LT3029 since the LT3069 seems to be rare, at least as a regulator.
The answer is in the datasheet. No it does not work with zero external components, it needs at least six total components for a single output. It's also a pretty unfriendly part to work with unless you have a premade PCB or proper equipment (DFN with 0.45mm pitch or MSOP with 0.5mm pitch- and it's expecting a ground plane for heat dissipation).
All measurements were taken in still air on a four-layer FR-4 board with 1oz solid internal planes, and 2oz external trace planes with a total board thickness of 1.6mm.
But you don't need it- according to the official web page for the Mega:
Input Voltage (recommended) 7-12V
So, 12V is within the recommended range. The 2A is sufficient. The microcontroller board will draw what it needs (and no more) when connected correctly. You only need to worry about the current if you plan on drawing a lot of current from the I/O pins or from the internal regulator.
Edit: LOL I put that "when connected correctly" in there before seeing your comment on your classmate. It's kind of important.