Hello , It's very interesting, but I was not able to find the chip reference in the freescale web site. Gerard

-----Message d'origine----- De : amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] De la part de G0MRF@aol.com Envoyé : mercredi 18 février 2009 12:54 À : amsat-bb@amsat.org Cc : g7hia@btinternet.com Objet : [amsat-bb] Solar cell charging of Li ion.

Hi.

This is a bit 'geeky' but may be useful to any cubesat builders reading the BB.

Freescale have a nice video on You Tube showing their new ultra low voltage DC-DC converters being used to charge a Lithium ion cell.

From a single solar cell with an onload voltage of just 349mV they are

charging a lithium ion battery at 3.82V at 63mA with about 83% efficiency.

_http://www.youtube.com/watch?v=7p9p2ySdcdM_ (http://www.youtube.com/watch?v=7p9p2ySdcdM)

Sorry for the bandwidth. Geek time over. - This may be useful copied to the cubesat reflector.

David G0MRF

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