LED torch using MAX660

Posted on Feb 6, 2014

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. @Taimu

Click here to download the full size of the above Circuit.

r, 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!

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