> http://focus.ti.com/docs/prod/folders/print/tl497a.html >=20 > seems like filling your needs... Linear Technology also have switcher chips that will do this. Check out LT1611 and LT1617 as starting points. LT1617 does one Li-Ion cell to -15V, but could do lower as it has external feedback resistors, and comes in SOT23 package. --=20 Scanned by iCritical. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .