It operates from an input voltage from 2.7V to 5.5V, optimizing it for single cell Li-Ion and multicell alkaline/NiCd/NiMH sources. Its 1MHz constant switching frequency allows the use of tiny, low profile inductors and capacitors while keeping input and out put noise low and well controlled. The combination of high efficiency, low noise and extremely small total solution footprint makes the LT3593 ideal for handheld applications, requiring up to 10 white LEDs for backlighting.
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. The LT3593 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 a ±5% reference accuracy.