At 09:55 AM 8/29/2009, M.L. wrote: >I just designed-in an LM2623. > >Do you folks have any similar chips that you like? I've used the LM2623 in a couple of different products now - they work well and I had no problems making them work. One product uses 3- AA cells boosted to 5V, the other uses a pair of NiMh cells boosted to 5.5V & 7.5V (2 separate LM2623 chips). The only thing to watch out for is when you try to run them from your bench supply - the supply absolutely has to be able to supply at least 3A without going into current limit for the first few ms after applying power. Otherwise, the supply goes into current limit and stays there - and the LM2623 doesn't work. That caused me some grief when I went to power up the first prototypes. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist