Temporarily increase voltage from 0.7v to 1.1v - Electronic Circuits Projects Diagrams Free

ee0jmt · 6th November 2009, 01:55 PM

Hi All,

I was wondering if some one could help me.

I have a 0.7V power source and an IC that will run from 0.7V but it initially requires 1.1V.

Is there a way I can temporarily increase the voltage from 0.7v to 1.1v during switch on?

Thank you in advance!

The IC I am using is http://www.microsemi.com/datasheets/lx1732.pdf

dknguyen · 6th November 2009, 01:58 PM

Maybe a voltage doubler like a 555 timer voltage doubling circuit?

Mikebits · 6th November 2009, 02:13 PM

How about sharing the data sheet of the IC you are using.

KMoffett · 6th November 2009, 02:18 PM

dknguyen,
I don't think a 555 will work as a boost converter at Vcc=0.7v.

ee0jmt,
What's the IC? Are you intending to run from a small solar cell?

ken

ee0jmt · 6th November 2009, 04:10 PM

The data sheet for the component I am using can be found at

http://www.microsemi.com/datasheets/lx1732.pdf

MikeMl · 6th November 2009, 04:51 PM

Quote:

Originally Posted by ee0jmt

...I have a 0.7V power source and an IC that will run from 0.7V but it initially requires 1.1V.

Is there a way I can temporarily increase the voltage from 0.7v to 1.1v during switch on?
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Only by using a small battery; it doesn't need much capacity, but it would have to isolated once the smps starts running.

Papabravo · 6th November 2009, 09:44 PM

Wait a minute here. It's not like you have the ability to tell the input to drop to 0.7V after startup. The feature is designed to keep the system working after startup at 1.1V down to 0.7V. You realize that when the input drops to 0.7V, the chip has to work harder to compensate for the drop in input voltage. I can't imagine that you would actually want to work on the edge like that since you would be on the brink of failure pretty much all the time. A couple of millivolts of ripple on the input and your output will collapse.

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6th November 2009, 01:55 PM	#1
ee0jmt	Temporarily increase voltage from 0.7v to 1.1v Hi All, I was wondering if some one could help me. I have a 0.7V power source and an IC that will run from 0.7V but it initially requires 1.1V. Is there a way I can temporarily increase the voltage from 0.7v to 1.1v during switch on? Thank you in advance! The IC I am using is http://www.microsemi.com/datasheets/lx1732.pdf Last edited by ee0jmt; 6th November 2009 at 04:08 PM.

6th November 2009, 01:58 PM	#2
dknguyen	Maybe a voltage doubler like a 555 timer voltage doubling circuit? __________________ Tanaka Sensei (avatar) says: Please spell it "ridiculous" correctly! Not "rediculous". ^^

6th November 2009, 02:13 PM	#3
Mikebits	How about sharing the data sheet of the IC you are using. __________________ Pay it forward.

6th November 2009, 02:18 PM	#4
KMoffett	dknguyen, I don't think a 555 will work as a boost converter at Vcc=0.7v. ee0jmt, What's the IC? Are you intending to run from a small solar cell? ken __________________ "To invent, you need a good imagination and a pile of junk." Thomas A. Edison (1847 - 1931)

6th November 2009, 04:10 PM	#5
ee0jmt	The data sheet for the component I am using can be found at http://www.microsemi.com/datasheets/lx1732.pdf

6th November 2009, 09:44 PM	#7
Papabravo	Wait a minute here. It's not like you have the ability to tell the input to drop to 0.7V after startup. The feature is designed to keep the system working after startup at 1.1V down to 0.7V. You realize that when the input drops to 0.7V, the chip has to work harder to compensate for the drop in input voltage. I can't imagine that you would actually want to work on the edge like that since you would be on the brink of failure pretty much all the time. A couple of millivolts of ripple on the input and your output will collapse. __________________ We never have time to do it right; but we always have time to do it over. Last edited by Papabravo; 6th November 2009 at 09:46 PM.