A80605-1 Datasheet | Allegro MicroSystems

FEATURES AND BENEFITS - Automotive AEC-Q100 qualified - Enhanced fault handling for ASIL B system pliance - Wide input voltage range of 4.5 to 40 V for start/stop, cold crank, and load dump requirements - Operate in Boost or SEPIC mode for flexible output - Gate driver for external MOSFET to deliver higher output power - Six integrated LED current sinks, up to 140 m A each - Boost switching frequency synced externally or programmed from 260 k Hz to 2.3 MHz - Programmable 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: Not to scale 24-Pin 4 mm × 4 mm QFN with Wettable Flank DESCRIPTION The A80605 is a multi-output LED driver for automotive applications such as exterior lighting, heads-up display, and mid-size LCD backlighting. It implements a current-mode boost/SEPIC converter with gate driver for external N-channel MOSFET. The A80605 provides six integrated current sinks driving up to 140 m A per string. Multiple sinks can be paralleled together to achieve higher LED currents up to 840 m A. The IC operates from single power supply from 4.5 to 40 V; once started, it can continue to operate down to 4 V. This allows it to withstand stop/start, cold crank, and load dump conditions encountered in automotive systems. The A80605 can control LED brightness through an 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. Continued on next page... APPLICATIONS - Automotive infotainment backlighting - Automotive heads-up display - Automotive interior and exterior lighting VIN 4.5 to 40 V Optional Input Disconnect RSENSE RADJ Q2 D2 L1...