Multi-output boost converter LED driver ICs with fault-tolerant protection

Designed for automotive infotainment and robust industrial backlighting and lighting applications

The new A8518 and A8519 from Allegro MicroSystems Europe - the latest additions to the company’s portfolio of LED driver ICs for LCD backlighting applications – are multi-output boost converter devices with built-in fault-tolerant protection.

Each device integrates a current-mode boost converter with an internal power switch with either two current sinks (dual string) in the A8518 or four current sinks (quad string) in the A8519. Both devices are targeted at the automotive and industrial markets.

In the automotive sector, end applications include high-efficiency, high-dimming-ratio, low EMI automotive infotainment and instrument cluster LCD backlighting, head-up displays, interior lighting and accent lighting. The devices are also suited to robust commercial and industrial backlighting and lighting applications.

In the A8518, the boost converter can drive up to 22 white LEDs, eleven per string, at 200 mA. The LED sinks can be paralleled together to achieve higher LED currents of up to 400 mA. In the A8519, the boost converter can drive up to 44 white LEDs, eleven per string, at 100 mA each. The LED sinks can be paralleled together to achieve higher LED currents of up to 400 mA.

Both devices contain industry-leading features such as high dimming ratio, string current matching, frequency dithering and fault detection. They also include input current sensing and gate drive to control an optional input disconnect MOSFET.

The A8518 and the A8519 are AEC-Q100 qualified and operate from a single power supply with a 4.5-40 V range. This allows each part to withstand load dump and start-stop conditions encountered in automotive systems.

The A8518KLPTR-T is available in a 16-contact eTSSOP package (suffix LP) and the A8519KETTR-T is available in a 5 × 5 mm, 28-contact QFN (suffix ET) and a 20-contact eTSSOP package (suffix LP).  All packages have an exposed pad for enhanced thermal performance.

About Allegro

Allegro MicroSystems, LLC is a leader in developing, manufacturing and marketing high-performance semiconductors. Allegro's innovative solutions serve high-growth applications within the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts (USA) with design, applications, and sales support centers located worldwide. Further information about Allegro can be found at www.allegromicro.com

Allegro MicroSystems Europe, headquartered in Chertsey, United Kingdom, is the European sales and marketing operation, and operates a network of representatives and distributors throughout Europe.  Allegro also has an engineering design centre in Edinburgh in Scotland and an application and marketing centre in Annecy in France.