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How to convert my 3.8V power output into a USB port

USB PCB DC-DC Conversion

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#1
ziadtalge

ziadtalge

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Dear all,

 

First of all I am an electrical engineer specialised in power and lighting systems. I have an electronics project that i have been working on for my Final Year Project at the University and have arrived to a dead end. After surfing the internet and forums i couldn't find any solution to my problem so i came here to post this topic hoping to get a solution from electronic hardware experts.

 

What i have is an LTC3588EMSE-1 board form Linear Technologies and i am getting a 3.6V output between the VOUT and the GND pin of the board. What i am trying to do is to connect this output to a usb port in order for me to connect any kind of load using a usb cable.

 

Is there any way this could be done? any special circuitry needed or is it possible to directly connect the port to my board?

 

A reply and technical assistance is highly appreciated.

 

Thank you for taking the time reading and replying to my post.

 


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#2
RKinner

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Since the standard  USB power is 5 v over pins 1 and 4 (see: http://www.hobbytron...onnector-pinout).  I would think you would need to step up the 3.6 volts to 5 volts.  I found this as a possible solution

 

http://www.ti.com/li...nk/lmr61428.pdf

 

Your LTC3588EMSE-1  appears to only have 100 ma of output ( http://www.linear.co...oduct/LTC3588-1 ) and with losses in the conversion your output current is going to be less so I'm not sure what devices you will be able to power with this.  See: http://www.ti.com/li...118/slyt118.pdf


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#3
ziadtalge

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Since the standard  USB power is 5 v over pins 1 and 4 (see: http://www.hobbytron...onnector-pinout).  I would think you would need to step up the 3.6 volts to 5 volts.  I found this as a possible solution

 

http://www.ti.com/li...nk/lmr61428.pdf

 

Your LTC3588EMSE-1  appears to only have 100 ma of output ( http://www.linear.co...oduct/LTC3588-1 ) and with losses in the conversion your output current is going to be less so I'm not sure what devices you will be able to power with this.  See: http://www.ti.com/li...118/slyt118.pdf

 

Thank you for your reply.

 

I am obliged to be using this LTC board. Any further assistance for amplifying my voltage and current independently without having a VCC?


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#4
RKinner

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Don't see what else you can do.  Appears your LTC will only do 3.6 volts max output.  What are you trying to power with this?  Any chance it can accept only 3.6 instead of the minimum 4.4?


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