driver for led

Hello friends, I need your help, I need an expert who designs an electronic circuit that acts as a driver for a power LED, the circuit must have an input voltage from 3v to 18v and a 12v and 2.1A output ,
Help me do this
thank you

  • 0
    •  Analog Employees 
    on May 14, 2018 5:54 PM


    Please provide us with more information so we may find the proper support person to assist you.

    • Product number and detailed description of the problem at hand
    • Schematic of the application (even a partial schematic would be great)
    • Detailed description of the conditions: input signal level, output signal power, supply voltage and current, common-mode voltage (input/output), etc.
      • Attach a block diagram (This is usually a good way to describe both your setup and the signal levels being applied, especially if you have multiple parts in the signal chain.)
      • Is this reproducible or intermittent?
      • Steps to reproduce the issue
    • All pertinent numbers and data
    • Screenshots displaying the problem
    • What is the full error message? Include any relevant log files or messages as an attachment. 

    Thank you

  • 0
    •  Analog Employees 
    on May 15, 2018 4:43 PM

    Hi Lidas

    I used the requirements in your post to identify these potential products:





    Do these look suitable to your application?  Each has a demo board that you can find by visiting the specific product page for the part (URL links above).  The demo board has a schematic and BOM listing, and you can download the design files for the board as well. 

    If you are interested to hire an expert to design the system for you, let me know and I will see if I can help.



  • I'm interested in an expert who designs the circuit for me, you let me know

    Best regards


  • to be precise, I need a driver that can be powered by 2 cells, 3 cells and 4 cells, and I feed an XHP70.2 led
    This LED has these characteristics, there are two types of this LED 6v and 12v
    4.8 A (6 V)
    2.4 A (12 V)

    I do not know how to make the circuit I'm not an engineer, I'm a simple hobbyist, I'm looking for someone who designs the circuit,
    can you help me please

  • 0
    •  Analog Employees 
    on Jun 14, 2018 11:09 PM

    Hello lidas,

    I see that you are looking for an LED driver with these specs...

    input voltage from 3v to 18v and a 12v and 2.1A output

    This clearly requires one form or another of a buck-boost topology.

    The LT8391 is a great buck-boost to use (with its 2MHz LT8391A). However, that part only runs down to 4.0V input. If this is okay for minimum input, then LT8391 is the best circuit for you to use with the standard demo circuit DC2345A being available and the recommended first circuit for you to try. Files are on our LT8391 product page.

    If you really need 12V 2.1A output from as low as 3V input, you will need high peak switch current and the recommended part for you is a synchronous LED driver controller LT3762. It is a new IC and is available now. The DC2342A is configured as a boost, but you can configure this part as a buck-boost mode converter with a few small changes to the demo circuit. The circuit on the back page of the LT3762 datasheet is similar to your specs. We have made this reference design for customers like you.