Just wanted to let the list to know I talked to linear and they told me the problem is most likely cause by mechanical bouncing when the battery is plugged in. I can't really remember the whole theroy behind it, but besically, the bouncing would cause the sw pin to see more then 6 volts(becuase of di/dt) and would cause a condition where the device would never really settle to the proper voltage. I guess I buy the story, but I have one of those "hmmmm, I dunno about that feelings". I'll have to try it and see. Was a little preterbed also because I think the datasheet should make some mention of this, it says in the datasheet "Typically, SHDN should be connected to VIN through a 1M pull-up resistor". But I guess it's my fault for not thinking of debouncing. I'll keep you posted, Aaron -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu