Driver powers 10 white LEDs
1 October 2008
Opto-Electronics
Linear Technology has released the LT3593, a high efficiency constant current white-LED driver housed in both 2 x 2 mm DFN and ThinSOT packages. It features a unique high-side LED current sense topology that enables the LED cathode to be connected directly to ground, creating a single wire current source. A single digital control pin enables set-and-forget LED dimming with ratios as high as 32:1.
The driver is designed to drive up to 10 white LEDs from a single Li-Ion cell at efficiencies over 80%. It operates from an input voltage from 2,7 to 5,5 V, optimising it for single cell Li-Ion and multicell alkaline/NiCd/NiMH sources. Its 1 MHz constant switching frequency allows the use of tiny, low profile inductors and capacitors while keeping input and output noise low.
The LT3593 ensures the uniform brightness of each LED by acting as a constant current source, delivering the same current to each white LED, regardless of fluctuations in the LED’s forward voltage drop, which varies with temperature, manufacturing tolerances and age. It uses a single wire digital serial interface to deliver 32:1 linear brightness control. Additional features include output disconnect in shutdown, open LED protection and ±5% reference accuracy.
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