I use the LM2936 because it also has a VERY low quiescent current. It doesn't provide 100ma - in fact I use two in parallel in one design because it was the best choice when the design was implemented several years ago. Measurement of typical quiescent currents showed them to be much better than the data books worst case. Perhaps there is now a better choice. If anyone can suggest a very low dropout very low quiescent design that also does 100ma I also would like to know. . A discrete component regulator using 4 transistors (or 3 if the main pass element is a darlington) will better any commercial design (3 years ago :-)) in terms of quiescent current, dropout and pass current but the higher parts count may make it unacceptable. . .regards Russell -----Original Message----- From: Aaron Hickman > Can anyone suggest a 5V regulator with low quiescent current and >able to supply at least 100mA of current? There are so many to choose >from, so I thought some of you might have a favorite I could start with. >Aaron Hickman >