I'm looking to switch a set of LEDs (think vehicle tail lamps) from a 3.3v pin on an XBee or perhaps later an Atmega (also at 3.3v). Each of the LED lamps should be under an amp @ 12v. Logic level mosfets seem to be popular, like the IRLZ24, but even these seem to require 5v to get full saturation.
I'm looking to independently switch on and off 4 different sets of lights. Right now my project already has 3.3v and 12v power available. Which would make more sense? - 3.3v to a mosfet that is fully operated by 3.3v. (exist?) - 3.3v to a small transistor to switch 12v to a mosfet to switch the lights. (most parts, but seems most likely) - 3.3v to a transistor that can switch the lights directly. (possible?) - 3.3v to 5v via single direction level shifter, to logic level mosfet. (would require adding 5v regulator just for the shifter, but could handle all 4 in one chip)