Solar Powered Lithium Ion Battery Charger

The circuit below feeds a
controlled current and voltage to a 3.6v lithium ion battery. The
current is limited to 300ma and the voltage is limited to 4.2 volts. The
circuit uses a LTC1734 IC from Linear Technology. No diode is needed
between the circuit and a 6 volt solar panel. Some very nice 6 volt
solar panels are available from http://www.plastecs.com
Their SP6-200-12 cranks out about 1 watt while the SP6-300-12 can
produce about 2 watts. Assuming a 6 hour sunlit day, the 2 watt panel
will pump about 1.8 amp-hours into a battery.

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