A new family of multichannel LED drivers from Intersil provides an ultra-low dimming capability to extend battery life. The ISL97671/2/3/4 series reduces undesirable backlight-induced visual artefacts such as flickering, shimmering and banding that are observed when using conventional LED drivers. The devices minimise power loss by using a proprietary dynamic headroom control circuit to detect the highest voltage LED string, and then regulate the boost output to the minimum required voltage. The devices drive up to six 40 mA strings of LEDs from a 4,5 V to 26 V input. A highly accurate LED current matching circuit achieves ±0,7% current matching between LED strings. The LED drivers also include an integrated boost converter to step up the input voltage to support LED stack voltages up to 45 V.
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