Allegro MicroSystems, LLC Expands Automotive LED Drivers Portfolio with Simple Buck-Boost Solution

Uniquely Fills Automotive Market need for 3-4 WLED Driver Solution

October 9, 2018

Allegro MicroSystems, announces the ALT80802, their latest addition to the family of 62xx/808xx LED Drivers for Lighting. The ALT80802 addresses a key market trend of 3-4 White LEDs in a single string powered from 12 V battery input, which is very desirable for Fog, Backup, DRL, Side Mirror and other Automotive Lighting applications. The ALT80802 can meet this requirement with a solution that very few competitors can offer, and uniquely provides 2 MHz operation, enhanced performance in PWM dimming capability and fault protection, reducing the external component count. Furthermore, this new device can be operated in buck mode up to 2 Amps, to drive 1-2 WLEDs from the battery or up to 12 WLEDs from a pre-boost supply.

The ALT80802 is a high-frequency switching regulator that provides constant output current to drive high-power LEDs. It is designed to aid in EMC/EMI design by frequency dithering, soft freewheel diode turn-off, and well controlled switch node slew rates. A programmable oscillator allows the ALT80802 to switch up to 2.5 MHz, outside EMI-sensitive frequency bands such as the AM band. It integrates a power MOSFET for step-down (buck) or inverting buck-boost conversion. The 50 V-rated Enable pin can be tied to Vin for automatic startup, to support battery-level PWM dimming common in legacy body controllers. The wide input range of 3.8 to 50 V makes the ALT80802 highly flexible.

With current-mode control and simple external compensation, the ALT80802 can achieve fast transient response. The control loop of the ALT80802 is designed for PWM dimming operation to achieve low dimming on-time, low turn-on overshoot, accurate PWM duty cycle, and wide dimming range. Extensive protection features of the ALT80802 include pulse-by pulse current limit, hiccup mode short-circuit protection, open/ short freewheeling diode protection, BOOT open/short voltage protection, VIN under voltage lockout, and thermal shutdown.

The ALT80802 is AEC-Q100 automotive qualified and is available in a small 10 pin DFN package with thermal pad and wettable flank.

About Allegro
Allegro MicroSystems, (Allegro) is a leader in developing high-performance power and sensing semiconductors. Allegro's innovative solutions serve high-growth applications within the automotive market, with additional focus on industrial and consumer/computing solutions. Allegro is headquartered in Manchester, New Hampshire (USA) with design, applications, and sales support centers located worldwide. For more information, please visit www.allegromicro.com.


Allegro MicroSystems, LLC は、高性能半導体の開発、製造、マーケティングにおけるリーダーです。Allegro の革新的なソリューションは、自動車などの急成長している分野で広く採用されているほか、オフィス オートメーション、工業、コンシューマー/通信市場でも注目されています。Allegro の本社は米国マサチューセッツ州ウースターにあり、設計、アプリケーション、営業サポートなどの拠点を世界中に展開しています。Allegro の詳細については、www.allegromicro.com をご覧ください。

 


記事に関するお問い合わせ:

Stephanie Fennelly
マーケティング広報担当ディレクター
電話: (508) 854-5363
sfennelly@allegromicro.com
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