Supercapacitor charger electronic circuit using LTC3625
A very simple supercapacitor charger electronic project can be designed using the LTC3625 IC designed by Linear technology to charge two supercapacitors in series to a fixed output voltage (4.8V/5.3V or 4V/4.5V selectable) from a 2.7V to 5.5V input supply. Automatic cell balancing prevents overvoltage damage to either supercapacitor while maximizing charge rate without using any balancing resistors .
This electronic circuit project presented in this circuit diagram has high efficiency, high charging current, low quiescent current and require low minimum external parts
Charging current/maximum input current level is programmed with an external resistor. When the input supply is removed and/or the EN pin is low, the LTC3625 automatically enter a low current state, drawing less than 1μA .
As you can see in the circuit diagram this project use solar energy to charge both capacitors .
The circuit is very simple requiring few external electronic parts , excepting the LTC3625 IC and solar panel this circuit project require a LT1784 op amp and some common external parts .