ALT80600

ALT80600 / ALT80600-1 LED Driver with Pre-Emptive Boost for Ultra-High Dimming Ratio and Low Output Ripple FEATURES AND BENEFITS Automotive AEC-Q100 qualified Wide input voltage range of 4.5 to 40 V for start/stop, cold crank, and load dump requirements Fully integrated LED current sinks and boost converter with internal power MOSFET Operate in Boost or SEPIC mode for flexible output Drives up to 11 series white LED in 4 parallel strings, at up to 120 mA per string (VF = 3.3 V max) Programmable boost switching frequency or sync externally from 1 to 2.3 MHz for ALT80600, 260 to 700 kHz for ALT80600-1 Clock-Out feature for internal switching frequency Adjustable boost frequency dithering to reduce EMI Advanced control allows minimum PWM on-time down to 0.3 µs, and avoids MLCC audible noises LED contrast ratio: 15,000:1 at 200 Hz using PWM dimming alone, 150,000:1 when combining PWM and analog dimming Continued on next page... PACKAGE: 24-Pin 4 mm × 4 mm QFN with Wettable Flank Not to scale DESCRIPTION The ALT80600 is a multi-output LED driver for small-size LCD backlighting. It integrates a current-mode boost converter with internal power switch and four current sinks. The boost converter can drive up to 44 white LEDs, 11 LED per string, at 120 mA (VF = 3.3 V max). LED sinks can be paralleled together to achieve higher currents up to 480 mA. The ALT80600 operates from single power supply from 4.5 to 40 V; once started, it can continue to operate down to 3...