The EL1848 is a constant current boost regulator specially designed for driving white LEDs. It can drive 3 LEDs in series or up to 9 LEDs in parallel/series configuration and achieves efficiency up to 91%.

The brightness of the LEDs is adjusted through a voltage level on the CNTL pin. When the level falls below 0.1V, the chip goes into shut-down mode and consumes less than 1µA of supply current for VIN less than 5.5V.

The EL1848 is available in 8-pin TSOT and MSOP packages. The TSOT is just 1mm high, compared to 1.45mm for the standard SOT-23 package.

Features

• 2.6V to 13.2V input voltage

• 14V maximum output voltage

• Drives up to 9 LEDs, 3 in a series

• 1MHz switching frequency

• Up to 91% efficiency

• 1µA maximum shut-down current

• Dimming control

• 8-pin TSOT and MSOP packages

• Pb-free Available

Applications

• PDAs

• Cellular phones

• Digital cameras

• White LED backlighting