January 13, 2011
Mechanical and Electronics engineer. Past includes thermal design of military computer systems, present and future in the medical device industry.
about a year ago
Has this been tested at 500mA output current? The MIC5219 would be dissipating ~0.85W at 500mA output [(5-3.3)*0.5]. Theta-ja is 220C/W, which would lead to about a 190C temp rise. I don’t know what the duty cycle of a XBee pro going “full bore”, but any design assuming the 3.3V regulator can sustain 500mA from a 5V input will quickly release the smoke.
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