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lithium-> regulator-> 3.3v

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pozzari

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I have a circuit running at 3.3 volts
it is powered by a LM2576 with 5v output and this 5 volts will power a lithium charger chip and a 3.3 regulator(LP3962)

The problem is when the battery is charging or ful chargered the voltage can be from 3.0 to 4.2 volts... what regulator i need to put to in the place of the LP3962 in red after the charger chip ??

I think needs to be a regulator with input from 3.3 volts to 4.2 and output 3.3 volts.

Current peak is 3A because have a Motorola G24 modem.
Thanks
 

Hi

Hi You will need to use a power path IC not a regulator

Use the Linear LTC4412 IC to control the power path to your GSM

Also don't use the same regulator to power the GPS and GSM since GSM best work on 3.8 ~ 4.2 V and GPS need 3.3V or less

All the best

Bobi
 

but i need a regulator with inputs from 3.3v minimun 4.4v maximum after the LTC4412 with output 3.3 or 3.8.

What regulator ?

Thanks
 

Hi,
Why not an LP296X?
K.
 

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