The Maxim Integrated MAX25603AUI/V+ is a 4-channel DC-DC LED driver controller designed for automotive exterior and interior lighting applications. It operates as a controller — no internal switching FETs — so you pair it with external N-channel MOSFETs sized to your LED string voltage and current. The part supports both step-down (buck) and step-up (boost) topologies, giving flexibility for a single 12V or 24V automotive bus driving series LED strings from 5V up to 60V supply. Four independent outputs let you control multiple LED channels (e.g., daytime running lamps, turn signals, matrix beams) from one IC, saving board space versus a multi-controller approach.
The wide supply range — 5V minimum to 60V maximum — covers load-dump and cold-crank transients common on automotive power rails without requiring external clamp circuitry.
Dimming and switching flexibility
Both analog and PWM dimming are supported, allowing either continuous current adjustment or high-frequency PWM for color-temperature control in RGB systems. No internal switch means the external MOSFET choice determines the actual output current capability; the controller itself handles the gate drive and regulation loop.