Help identifying battery power manager with 5V and 3.3V supply

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Hi all.
I am looking for a power management with chip with a 3V and 5V  supply along
with the capability of handling the decreasing voltage associated with
standard batteries. The 5V supply is for USB and needs to source at least
100 mA. The  3V supply needs to source around 70 mA to run the micro. Does
anyone have any suggestions? I am a pure digital guy so I am really out of
touch with the power chips. Any help is greatly appreciated. Especially
since I am an analog neophyte.
Chris



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