Allegro Microsystems A80603

Description

The A80603 and A80603-1 are multi-output LED drivers that integrate a current-mode boost converter with an internal power switch and four current sinks. The boost converter can drive four strings of LEDs at up to 120 mA, or LED sinks can be paralleled together to achieve higher currents up to 480 mA total. The devices operate from single power supply from 4.5 to 40 V; once started, they can continue to operate down to 3.9 V. This allows the parts to withstand stop/start, cold crank, and load dump conditions encountered in automotive systems. By using patented Pre-Emptive Boost control, an LED brightness contrast ratio of 15,000:1 can be achieved using PWM-only dimming at 200 Hz. Higher ratios are possible when using a combination of PWM and analog dimming.

Features

• Excellent input voltage transient response even at lowest PWM duty cycle
• Gate driver for optional P-channel MOSFET input disconnect switch
• Extensive protection against:
• Shorted boost switch, inductor or output capacitor
• Shorted FSET or ISET resistor
• Open or shorted LED pins and LED strings
• Open boost Schottky diode
• Overtemperature

Typical applications

• Automotive cluster, Automotive center stack
• Automotive Lighting, infotainment backlighting, Automotive exterior lighting

More information

• Datasheet
• IC product information