Allegro Microsystems A80604

Description

The A80604 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 A80604 provides four integrated current sinks driving up to 210 mA per string. Multiple sinks can be paralleled together to achieve higher LED currents up to 840 mA. The IC operatesfrom single power supply from 4.5 to 40 V; once started, it can continue to operate down to 4 V. This allows it to withstandstop/start, cold crank, and load dump conditions encountered in automotive systems.The A80604 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 ispossible when using a combination of PWM and analog dimming.

Features

• Automotive AEC-Q100 qualified
• Enhanced fault handling for ASIL B system compliance
• 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
• Four integrated LED current sinks, up to 210 mA each
• Boost switching frequency synced externally or programmed from 260 kHz 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 combining PWM and analog dimming
• Excellent input voltage transient response even at lowestPWM duty cycle

Typical applications

• Automotive infotainment backlighting, Automotive heads-up display, Automotive interior and exterior lighting

More information

• Datasheet
• IC product information