I'm trying to connect little 3v LEDs to a motorcycle's alternator and i want to regulate the voltage of it to 3 volts so the LEDs don't burn up
the alternator gives off 2.5 volts and over with 3 amps and over
i can't get my hands on a better regulator, and i have LF33CVs
how can i boost the possible current load? i know i can't connect them in parallel but the datasheet doesn't give a sample circuit
thanks
Electronic – Boosting load current of voltage regulator
current-limitingledvoltage-regulator
Related Solutions
Page 5-6, left drawing. That's all you need to do.
Capacitance value from the text is minimum 1uF (page 1). I'd say a 2.2uF input capacitance wouldn't go wrong either.
So, basically just (and I feel I'm being very kind by redrawing it):
simulate this circuit – Schematic created using CircuitLab
You don't need both supplies. 9V at 100mA is 0.9 watts. You need 3.3V at 150mA or .495 watts. A switching supply that converts the 9V to 3.3V will certainly be efficient enough to give you the 150mA that you need.
Look at the TPS62130 from TI for example:
http://www.ti.com/lit/ds/symlink/tps62132.pdf
There are countless other options from TI, Linear Tech, ON Semi, Maxim, Intersil, etc.
Best Answer
You may choose a higher current LDO regulator: