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Sonsivri > Electronics > Hardware and Tools (Moderator: bbarney) > how to li_po 3.7v to 5v power??
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baezzange
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« on: August 20, 2008, 05:04:29 17:04 »
i have 3.7v 2000mA li_po battery..
but, im using 5v power

how to 3.7v to 5v ?

help me~ beginners say~  Cry
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0sLtEd43bZ5z
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« Reply #1 on: August 20, 2008, 05:43:37 17:43 »
make or buy DC-DC step-up converter. depends on yoru skillz and power requirements.
you can by already made from Traco, Lamdba or any other supplier.
or you can build yourself using MC34063 (up to 0,5A) or any other advanced IC like NCV3163 from Onsemi...
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dideco
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« Reply #2 on: August 21, 2008, 09:34:18 09:34 »
You can buy an emergency charger for cell phones. They usually use 1 or 2 AA (1.5 Volt) batteries to give out about 5 Volts. They use step up switching power supplies. You can modify it easily accoording to your needs. For example, changing the resistor value will change the output voltage.

Good Luck
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jimbies
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« Reply #3 on: August 21, 2008, 12:07:42 12:07 »
If you are thinking to make a step up convertor yourself. You can check
out the info at the following link -

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2590&param=en528243

 Smiley
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baezzange
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« Reply #4 on: August 21, 2008, 12:10:07 12:10 »
thx ur advice
try that
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cyberjok
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« Reply #5 on: December 25, 2008, 12:27:48 12:27 »
DC-DC
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tAhm1D
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« Reply #6 on: January 02, 2009, 01:31:49 13:31 »
Hi,
If your requirement is less than 40mA, you can build a very easy circuit employing LT1073. The circuit is as shown below:
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