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Suitable 3.3V voltage regulator(charge pump) for Lipo battery?

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Johnny101

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I want to regulate the voltage at 3.3V and my input voltage range is from 2.8V to 4.2V. Output current is 30mA. I am selecting MCP1252-33X50I/MS for this purpose. Is this appropriate charge pump for my specification? And I have not seen it's circuit except in datasheet. So anyone who have experience using it? your help would be appreciated.

Datasheet for MCP1252
**broken link removed**
 

Hi,

I just had a quick view at the datasheet.
The device seems to be suitable.

Now just follow the instructions given in the datasheet.
You usually don't need additional infirmation.

What else do you need?

Klaus
 

I am concerned about the the frequency here. Is there any internal oscillator? What is the role of the frequency here? And lastly what about the dropout voltage?
 

Hi,

read about charge pump. For sure they need a frequency and hence they need an oscillator.

Yes, what about the dropout voltage? What do you want to know about "dropout voltage"?

****
I´m not sure what you need to know, therefore some short basics:
* If the input voltage is higher than the output voltage then an LDO (without charge pump) is sufficient.
* if the input voltage is less than the output voltage then you need the charge pump (maybe followed by an LDO).

Klaus
 
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