# Is there any step up voltage IC that capable of amplify 200 mV to 500 mV up to 3 volt to 5 volt

Discussion in 'Power Electronics' started by dante_clericuzzio, Jun 23, 2016.

1. ### dante_clericuzzio Thread Starter Member

Mar 28, 2016
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2
If anyone has idea or any experience of doing this kindly advise - is there any IC which could step up 200 mV ~ 500 mV up to 3 volt ~ 5 volt. Which manufacturer and IC model can do this in the highest efficiency?

2. ### GopherT AAC Fanatic!

Nov 23, 2012
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4,094
How many amps of current does the 200-500 mV source supply?
How many amps of current will the 3 to 5 volts need to supply to another device?

And, please specific if this is a
- power conversion (a low voltage cell or photocell) that you hope to use to charge a cell phone type of question, or,
- a small signal of 200 mV from a sensor or musical instrument that you want to amplify to a more useful voltage

3. ### dante_clericuzzio Thread Starter Member

Mar 28, 2016
69
2
I would like to experiment amplifying small voltage like 200 mV to 500 mV produce by chemical reaction and see how efficient it can generate decent amount of voltage to light up LEDs or bulbs

4. ### GopherT AAC Fanatic!

Nov 23, 2012
6,340
4,094
So, the voltage of a chemical reaction is not useful until you assemble and segregate the two half-cell reactions to force the RedOx electrons through the wires and the salt bridge (or what ever your setup is).

To get higher voltages from a chemical reaction, you need to put multiple cells in series, like the lead acid battery of a car. They get 12V by putting 6 lead acid cells in series.

The surface area of the electrodes, carrying capacity of the electrolyte will determine the current. What reaction are you considering that is only a few hundred millivolts?

5. ### Roderick Young Member

Feb 22, 2015
408
168
Sounds like you're making batteries or something. It would be easier to put 10 of them in series than to struggle with stepping up such a small voltage. Efficiency is really poor for those circuits. But if you want to do it, look into the "Joule Thief" circuit with a depletion mode MOSFET. That's supposed to theoretically work down to 100 mV, with horrible efficiency, of course.

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6. ### MrChips Moderator

Oct 2, 2009
12,657
3,461
Here are a couple for you to look at:

225mV to 5V input
LTC3105

Input as low as 20mV
LTC3108

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7. ### dante_clericuzzio Thread Starter Member

Mar 28, 2016
69
2
This is interesting thank you mrchips...although they are quite pricy

8. ### dante_clericuzzio Thread Starter Member

Mar 28, 2016
69
2
U men
U mentioned about surface area which one should be larger area positive or negative