Arduino 3.3V and LiPo UPS

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i'm looking easy , smart  :p way have 3.3v arduino pro mini 1 little lipo (1 cell - 1s)  embeded, acting ups.

lipo must on charge when external power (from dc or usb) available , feeds arduino when dc or usb unplugged. of course, arduino mustn't turn off in meanwhile!

i know olimexino , same arduino pro mini.

i don't want use shield. must cheap solution. found couple of ics useful: max1551/5 , ltc4071.

has worked on matter?!

one solution battery charger adafruit sells.  you hook battery up, , if there external power, uses charge battery.  you can charge while arduino running.  adafruit sells 3 different modules of charger can power chip while charging batteries:



the chip adafruit uses first link mcp73861.  the mcp73833 new replacement mcp73861 (the biggest difference seems mcp73861 can use input voltages 12 volts, while mcp73833 can use voltages 6 volts, limits other boards come from).


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