Hi,
I am working on project Vehicle tracking system which include main component as GSM module, GPS module and MCU. I have seen some post regarding my requirement but failed to clear my quires.
I required Single cell Li-ion based battery backup power supply with function of power path management.
Requirements for power system:-
Input - Car battery 12Vdc / 24Vdc
output - 3.8Vdc - 4.2Vdc / 2A continues current
Battery used - 3.7V / 1100mAh to 2200mAh Li-ion
Out of 2A for system most of current required for GSM as 1.5A bust mode while data transmission which will happened after every 10S and in burst mode Current 1.5A required for 577us in 4.615ms For detail i have attached File with this post named as "Burst
Functionality Required:
1) The system should design in the way, it will give 4Vdc when main supply is available and simultaneously charge the battery.
2) When supply cutoff the load aromatically shifted on battery.
3) Two voltage levels required 4V/1.5A for GSM and 3.3V/100mA For GPS and MCU.
4) Charging IC should work Standalone.
Project status:
As mentioned above requirements i have collect data and prepare one logic for this system as
BQ24074 Liner charger IC followed by Buck of LM22670 and for one LDO TPS79333
Problem or quries:
1) According to Datasheet BQ24074 will provide current upto 1.5A online supply if the load required more current and the extra current will drawn from battery.
2) The burst mode of GSM will affect the charging topology of battery?
3) Is this system gives proper supply for my device? If not what can i do means like some reservoir CAP at GSM Vcc Pin?
4) Our should i preferred other component like BQ24250 main reason to avoid this is increase in Pin count and component count required alone with cost also.
Awaiting for your valuable feedback on this post please give me some solution on this quire.
If any other details or any information u want please let me know.
Thanks & Regards,
Rohan