On Mon, Sep 17, 2012 at 12:39 PM, Marc Nicholas wrot= e: > I'm using the MCP1640B in a design and have also had the "explosion" wher= e, > literally, some of the pins of the chip jumped off the board traces and > magic blue smoke came out. It was a polarity issue in my case, traced bac= k > to a reversed battery connector, although the supply voltage was never > greater than 5vdc. > > They're great little chips, but they do seem to not take abuse well ;) I was looking at the datasheet for the 1640 the other day any noticed that while the "feature list" touts an 800 mA capacity, the graphs show that the efficiency drops way off above 100 mA in many configurations. My interpretation is that this chip isn't really useful much above 100 mA in many cases. For those of you who were frying them, how much current were you pulling through them when they fried? -p. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .