ALT80600-1 Datasheet | Allegro MicroSystems

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 m A 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 k Hz 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 bining 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 m A (VF = 3.3 V max). LED sinks can be paralleled together to achieve higher currents up to 480 m A. The ALT80600 operates from single power supply from 4.5 to 40 V; once started, it can continue to operate down to 3.9 V. This allows the part to withstand stop/start, cold crank, and load dump conditions encountered in automotive systems. The ALT80600 can control LED brightness through external PWM signal. By using the patented ‘Pre-emptive Boost’ control, an LED brightness contrast ratio of 15,000:1 can be achieved using PWM dimming at 200 Hz. A higher ratio of 150,000:1 is possible when using a bination of PWM and analog dimming. The ALT80600-1 is functionally similar to the ALT80600, except it is optimized for lower switching frequency. Continued on next page... APPLICATIONS - Automotive infotainment backlighting -...