LED torch using MAX660

john April 7, 2010 20 Comments

This is a simple LED torch circuit based on IC MAX660 from MAXIM semiconductors. The MAX 660 is a CMOS type monolithic type voltage converter IC. The IC can easily drive three extra bright white LEDs.The LEDs are connected in parallel to the output pin 8 of the IC. The circuit has good battery life. The switch S1 can be a push to ON switch.

Circuit diagram with Parts list.



  • Assemble the circuit on a general purpose PCB.
  • The IC must be mounted on a holder.
  • The circuit can be powered from two torch cells connected in series.
  • The capacitors C1 and C2 must be Tantalum type.
  • The diodes D1 to D3 must be of 1N4148.
  • Rahul
    February 16, 2013

    How can i download the circuit diagram of led torch.

  • Seetharaman
    June 5, 2012

    Hi Kiran and Surendra the maximunm output drive current is just 100mA at a max of 5 volts. Hence it is not possible to drive beyond 300 to 350mw LEDs.

  • Surendra Biyani
    June 3, 2012

    Can MAX 660 in my LED of 1 watt be suitable to withstand 7 volts DC current. My requirement is to get 30 lumens of focussed light.
    Any heat will be generated ? If so then I may use a heat -sink

  • kiran
    June 2, 2012

    Hi, can this circuit drive three 1watt leds?

  • Rakesh
    February 24, 2012

    @Taimur, Led’s may not glow even in 3V supply! Cause different LED’s Have different drop out voltage( The minimum forward bias voltage to turn the LED on). For white LEDs, it’s higher than the 3V. Max 660 can derive -3V from the supply at pin5. so in the circuit, across the pin 5 and 8, a voltage difference of 6V is available. It’s sufficient to turn on the LED and glow it!

    @Srihari Rao, you can search for LM7660 IC too. It has similar functionality to that max 660!

  • Taimur
    February 23, 2012

    I didnt get one thing , if I can light up the LEDS using 3V battery directly then what advantage am I going to have by using the MAX 660 IC ? Please explain

  • November 23, 2011

    How much is MAX660 IC??

  • September 27, 2011

    CAn I ask a few question?
    what is the function of led torch using max660?please answer As soon as possible!!we badly needed it for our project!!!thankyou!!

  • September 27, 2011

    where we can apply this circuit led torch using max660?

  • Dipankar
    September 21, 2011

    MAX660 is costly.
    The cheapest method is to make a Joule Thief Circuit which uses only a 1.5 volt battery and can run 4 LED’s.

  • […] torch using MAX660 – [Link] Tags: Led, MAX660, Torch Filed in Led | 1 views No Comments […]

  • seetharaman
    June 16, 2010

    Hi Adnan there is no direct replacement

  • seetharaman
    June 16, 2010

    Hi Adnan no. there is replacement

  • adnan
    June 15, 2010

    max660 is too much expensive in my market is there any cheap replacement of this ic?

  • adnan
    June 2, 2010


  • seetharaman
    June 2, 2010

    hi Adnan you are right it is an application of max660 to generate equal negative voltage from input positive voltage, so with 1.5 volt input you can get -1.5 volt. with 1.5 volt you can operate 3 high brite white leds (ic capacity 100mA max), 3 leds torch operating just with a single cell. reader can refer the datasheet.

  • adnan
    June 1, 2010

    we can glow these 3 leds directly from the 3 volts battery then why we use the ic?what is the effect of ic and working tell me?

  • abid
    November 16, 2009

    i have the project of counter by labs and idonot about it please help me

  • June 22, 2009

    led torch

  • Sottapilla
    March 26, 2009

    I am a new person to the electronic circuits, with minimum knowledge about the circuits. Kindly do publish the range of applications the circuits support, and also any more additions to the circuits

    with regards


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