low input voltage buck boost (dc-dc) converter

[nxavier]

buck boost dc dc converter

we are designing a battery charger from a solar panel. we have a power path battery charger which requires an input voltage of about 5V.

in this case, we need a buck boost converter with min Vin of maybe 0.3-0.8 and max Vin of maybe 6V (since that is the highest voltage our flexi solar panel can generate).

Maybe you have encountered a buck boost converter with these specs. Again here it is:
Vin (min) = 0.3- 0.8
Vin (max) = 6V
Vout = any range that would include 5V.

Your help will be very much appreciated. thanks in advance.

 

[cristivasilache]

low input voltage dc-dc converter

how about the available current ? you didn't mentioned about the current value. to be able to make DC-DC conversion at resonable efficiency you need at least 1A. and the power supply must be made from at least 2 stages. one which can accomodate input voltages between 1.5-6V and will generate 5-10V at 10-25mA, enough to control a boost stage which will be the power stage. i mentioned about the 1.5-6V interval, and not 0.3-6 as you said, since at this voltage is extremely difficult to get some power from the converter. not to mention that the current provided by the cell will be close to zero.
i designed a similar converter which have to produce 12V DC from a single 2V 600Ah battery element.

 

[nxavier]

buck boost solar

our solar panel can only deliver at 200mA max. so maybe a converter that can accommodate 1A would be enough. I am thinking that maybe we wont need the power generated at inputs below 1A since it wouldnt be substantial. nevertheless, maybe you know one with inputs at around 1V.

our supply also has two stages, the one I am asking is for the first stage that will enable the charger.

thanks

 

[cristivasilache]

dc-dc converter buck-boost converter

take a look at linear website and national semiconductor. they have plenty of ic's which work in boost mode starting at about 1.2V or even switched capacitor, but this can olny provide about double or 4 times the input voltage.

 

[Teddy]

low input voltage battery charger

honestly I can't imagine how to make this one. 0.3V is really low. But it sounds like fun from IC design perspective.

 

[kalathiya_gaurang]

dc dc converter solar panel

Hi der anyone can help me to built a dc-dc step down switching power regulator which has 12vdc as input and 5vdc(1A) as output???

 

[walkura]

buck-boost dc converter

Texas instruments recently introduced a serie capable of this .
https://focus.ti.com/docs/prod/folders/print/tps61097-33.html
I hope this is of help for you .
If this one doesnt meet the criteria ,they do have others in this range .

Good luck .