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Have a look at the battery life of some phones - they usually give the talk time & standby time. With the battery capacity data (in Ah) you can then calculate a rough power consumption. You will find that standby times can be a few weeks and talk times a few hours, so you will see what consumes the most power. The displays consume a lot and bigger displays consume more. WiFi usually consumes more than phone calls, I believe. In standby they can use the signal received strength to reduce the receiver power consumption if the signal is strong.
Keith.
Not required for LCD or audio, but boost is there for white LED backlighting and for USB Vbus when USB on-the-go mastering is included.
There are three or more switcher coils in typical smart phone.