I am a bit confused about the way to dimension Power Management Unit, and power rail for electronic system.
I understand quite well LDO and DC-DC in terms of voltage, but i don't understand well about current (although I know kirchoff law). Particularly I am confused about the maximum total current that a source can deliver/supply to load in the case of battery powered one. Normally, I suppose that at equal voltage we should add up current to get total current needed, but how to put this in face of battery. Does Lipo battery got maximum current it can deliver to supply many loads ?
Let's say we power a system with a Lipo battery 3.7V-4.2V, 1000mAH.
The system got: - 1 MCU such as a MSP430 (http://www.ti.com/product/MSP430FR5969) - one auxiliary chip such as RF chip (let's say CC1310, datasheet here : http://www.ti.com/lit/ds/symlink/cc1310.pdf) - one module such as GPS (quectel L70, http://dl.roboticngo.com/uploads/Quectel-L70-Hardware-Design-V2-0.pdf ) - one another module such as GSM (quectel M95 http://www.soselectronic.com/a_info/resource/c/quectel/M95_HD_V1.0.pdf) - one EEPROM such as ST one - one TF Card such as SD CARD.
How do i verify this is achievable to supply all those chip and module with our Lipo battery and how do I build our power management architecture?
How do I verify this system can work properly and how would you organize the power rail in this situation and with which PMU ?