Doubt in GSM MODEM module

b.adithya

New Member
WHAT IS THE USE OF LM2576S IN GSM MODEM MODULES?
and
Difference between serial and debug ports in this modems?
 
To improve PA efficiency at reduced power levels. It is a switching regulator that reduces Vcc on PA as power setting is reduced.

At power levels below about 15 dbm the current in the PA flattens out at about 80-100 mA. Reducing the Vcc with a switcher reduces the battery current drain.
 
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