Hi,
Kindly refer the attached block diagram.
The input voltage is 4.5V - 42V DC. With this voltage i need to charge 3.7V li-ion battery and the output with battery backup should be as follows,
1) +5V / 500mA (for USB sections etc)
2) +3.6V/2.5A (for GPRS modem, GPS section etc)
3) 3.3V/ 500mA (for Microcontroller,memory,serialport etc)
4)1.2V/100mA( for microcontroller CPU core).
Kindly suggest the suitable battery charger and battery/mains switch, so that i can achieve this power management with minimum regulators.
Awaiting for your feedback at the earliest.