MAX630 solar power supply circuit diagram

This solar power supply circuit diagram is based on the MAX630 CMOS micropower step-up switching regulator manufactured by Maxxim Semiconductor  .
Maxim’s MAX630 CMOS DC-DC regulator is designed for simple, efficient, minimum-size DC-DC converter circuits in the 5mW to 5W range.  The MAX630 IC provide all control and power handling functions in a 8-pin package .
This solar power supply circuit can deliver a 4.8 or 7.2 volts output voltage using a 3 volts input from a bank of photocells .

The efficiency of this solar power supply circuit is around 70% .
To chose the output voltage of the solar power supply regulator you need to choose the correct value of the R1 resistor   . If you want that the power supply to provide a 4.8 volts at the output , the value of the R1 resistor should be around 453K ohms and if you want to obtain a 7.2 volts at the output , the value of the R1 resistor must be around 273k ohms .  The value of the C1 and C3 from the circuit diagram is in microfarads .
The maximum current provided by this power supply circuit diagram is around 15mA