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how to convert 12v 0.28A to 3.7v 0.55A

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Nisar.Ahmed

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Hi,
I am going to build a circuit for cell phone charger but i have problem to convert these voltages and currents, when i convert voltages then current has been too much less .. .
any one who help me plz???
 

Any simple buck converter might do the job. Just take a look at National Semi Website. They got the WEBENCH tool that will do the design for you... I belive this current wont be a problem with 80% eff design.
 

The LM2575-adj should work fine .. it's a switching step-down voltage regulator ..

**broken link removed**

IanP
:wink:
 

try Top switch .... with V & A regulator !
 

Just make sure about the charging characteristics of the battery in question. Different technologies need to be handled different. To prevent an explosion a good practice is to always do heat sensing as well.
 

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