Posted on May 17, 2011 at 13:37hi,
We now intend to move our STM32 based board to a battery powered one (i.e. for the hand held version of our device). However my inexperience is keeping me from making a good selection from the many controllers available from multiple chip vendors. Therefore please help me if you have *ELEGANTLY* solved your requirements if they were similar to mine as below.
1: We need an integrated inductor less (assuming inductor less is efficient and less taxing on our development see:
http://www.design-reuse.com/articles/19850/inductorless-inductor-based-integrated-switching-regulator.html
) switched power supply with dual output 3.3v and 5v and additionally with a lithium ion battery charger. Basically whatever these standalone MP3 players use should also work for me fine (assuming they are single power output).
2: if dual power is problem (both from design, BOM, and expense) then I can live with 5v out and will use a 3.3V LDO like LM1117 though this may not be power efficient (so would be plan B). or we will change the design and only use the 3.3V as another option.
3: While primarily battery powered, the device will use external power whenever battery is being charged ( like in a car.....and no, I am not building another GPS unit;-) ). When the external power is removed, the battery backup takes over.
4: simple design low BOM and preferably low cost
Thanks in advance
[ This message was edited by: pranamesh on 12-01-2010 20:34 ]
