Allegro Microsystems, LLC Introduces New Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver

Integrated Frequency Dithering for Low EMI

November 15, 2016

A6217  Product Image
Allegro MicroSystems, LLC introduces a new automotive, AEC-Q100 qualified single IC switching regulator that provides constant-current output to drive high-power LEDs. Allegro’s A6217 integrates a high-side N-channel DMOS switch for DC-to-DC step- down (buck) conversion. A true average current is output using a cycle-by-cycle, controlled on-time method. This new LED driver is targeted at the automotive lighting market and includes the following key applications: daytime running lights, front and rear fog lights, turn/stop lights, map lights, and dimmable interior lights.

Output current is user-selectable by an external current sense resistor. Output voltage is automatically adjusted to drive various numbers of LEDs in a single string, ensuring optimal system efficiency. LED dimming can be accomplished by logic-level or "chopped battery" PWM, as well as Analog dimming capability. The A6217 also features switching frequency dithering for reduced EMI signature.

The A6217 is an enhanced version of the popular A6213 and is available in a pinout-equivalent eSOIC-8 package (LJ), or a more compact 3x3mm wettable flank DFN-10 (EJ). Both packages have an exposed pad for enhanced thermal dissipation, and are lead (Pb) free with 100% matte-tin leadframe plating.


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.


Editorial Contact:

Stephanie Fennelly
Director - Marketing Communications
Tel: (508) 854-5363
sfennelly@allegromicro.com
.

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