I have a battery power PIC application that I have the opportunity to reduce the
 power by running
the PIC at 3V. I looked at Linear Technology, Maxim, National Semiconductor and
 Harris for a LDO
micropower 3V regulator and found MAX663 666 and 689. I was hoping for a three
 terminal TO-92
type part. The circuit has 4 Alkaline cells (6V) and draws 1.4ma @6V at 3V the
 draw is 0.74mA and
runs continuously until the batteries need replacement.

I don't  any experience using  switching regulators for battery power. Is this a
 viable option or is a
linear regulator a better choice for battery life.

Any  favorites??

- -Mark