The FAN5610 generates matched current source drives for a maximum of four LEDs. Since each LED current source has its own self-regulating loop, precise current matching is maintained even if there is a substantial forward voltage spread among the LEDs. LED pre-selection therefore is not required. In order to minimize voltage drop, and maximize efficiency, the value of the internal current sense resistors connected in series with the LEDs is very low (10). This is an important consideration for direct DC-driven white LEDs in battery-powered systems.