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3V BATTERY POWERED WHITE LED DRIVER - 12/06/2010

The circuit below will drive any LED color, including white LEDs, using a DC power supply ranging from 2v to 3.3v.  White and blue LEDs normally require over 3v, so the circuit below uses a charge pump scheme to deliver a constant LED light intensity from a voltage less than 3v.  The LED is rapidly pulsed with 3ma peak current, which remains fairly constant, even as the battery voltage changes.  The circuit is designed only for low LED current applications.  A common CR2032 lithium coin battery should run the light for two days.  A pair of 2.5 Amp-hour AA NiMH
cells should operate the circuit for nearly a month.

Click on Drawing Below to view PDF version of Schematic

Circuit Schematic 3v White LED Driver designed by Dave Johnson, P.E.



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