On Wed, Mar 24, 2010 at 12:53 PM, William "Chops" Westfield wrote: > The regulators that have both min and max ESR requirements make me > particularly nervous. =A0You can always change to ceramic and add > parallel caps to lower ESR, but ensuring a minimum ESR in an actual > circuit with who knows what additional bypass caps "nearby" seems > fraught with peril... As per the theoretical analysis, there will be a lower limit and a upper limit. With the newer ceramic stable LDO, the lower limit will be zero ohms (to use ceramic), but there will still be a upper limit. If you use ceramic, you will not hit the upper limit anyway. http://www.national.com/nationaledge/jul02/article2.html And typically I do not use LDO for very high current applications. So I am fine with ceramic capacitors for LDOs in my current designs. -- = Xiaofan http://mcuee.blogspot.com -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist