Megamini Regulator

The voltage regulator on the mega mini down regulates the input voltage to 3.3 volts. This 3.3 volts is used to power the microcontroller, the logic on the H-bridges and the radio module. Depending on load the voltage regulator needs about 100mV over 3.3 volts to get the correct output voltage. If the load is low and the IC cold, you might get away with a bit less. The regulator can output at most 250mA at this current it requires 450mV over 3.3 volts. However the micro can draw about 65mA at maximum and each LED about 20mA, the radio uses roughly 20mA and the motor driver use about 2mA each (of the 3.3 volt supply)

The datasheet for the regulator is here