Re: 300 mA from a microcontroller pin

Tomás Ó hÉilidhe wrote:
Arlet Ottens:

What are you driving that you need 3-state 300 mA outputs ? Depending on
the application, there may be alternative solutions.


A bi-colour LED that has only two pins (they're in parallel facing in different directions). If the microcontroller pin is high, then it'll be red. If low, it'll be green. If high impedance, it'll be off.

The maximum current rating for the LED package is 30 mA... except I'm flashing a display and will only have them lit one sixteenth of the time, so I'm gonna put a burst of 300 mA through them. (I've seen experiments where people flashed an LED putting an entire amp through it, so I don't think 300 mA will be a problem for a duty cycle of one sixteenth).


How about this one ?

http://www.freescale.com/files/analog/doc/data_***/MC33880.pdf

It seems to do what you want, if you don't mind the SPI interface (which can probably be done in software through regular I/O pins if you must)
.

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