LED Automotive Driver offers independently controlled channels.

Press Release Summary:



Integrating current-mode boost converter with internal power switch and 10 I²C programmable current sinks, Model A8517 provides 5,000:1 contrast ratio PWM dimming at 200 Hz. IC operates from 4.5–36 V, and can withstand up to 40 V load-dump conditions encountered in automotive systems. I²C interface allows user to set LED currents individually, up to 60 mA per LED channel. Housed in 28-pin eTSSOP package, driver is suited for LCD backlighting, instrument clusters, and daytime running lights.



Original Press Release:



Allegro MicroSystems, LLC Announces a New Ten-Channel LED Automotive Driver



Independently Controlled Channels with I²C Interface



Worcester, MA – Allegro MicroSystems, LLC announces a new programmable multi-output LED driver for LCD backlighting, instrument clusters, and daytime running lights. Allegro’s™ A8517 integrates a current-mode boost converter with internal power switch and 10 I²C programmable current sinks, and can provide 5,000:1 contrast ratio PWM dimming at 200 Hz. The IC operates from 4.5 to 36 V, and is able to withstand up to 40 V load-dump conditions encountered in automotive systems.



The I²C interface allows the user to set the LED currents individually, up to 60 mA per LED channel. Adjacent channels may be combined to drive higher-current LED strings. The PWM dimming duty cycle is also independently controlled for each LED channel, and each channel can be enabled/disabled independently if needed. This flexibility makes the A8517 a single solution for a wide range of LED applications, in some cases offering the ability to replace two or more LED driver ICs with a single device.



The A8517 provides protection against output short and overvoltage, open or shorted diode, open or shorted LED pin, shorted boost switch or inductor, and IC over-temperature. A dual level cycle-by-cycle current limit protects the internal switch against switch over-current. If needed, the IC can drive an external P-FET as input-disconnect switch that is triggered by an integrated current sense. The A8517KLPTR-T is available in a 28-pin eTSSOP package and is priced at $2.95 in quantities of 1,000. 



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.



Contact information: Stephanie Fennelley, Allegro MicroSystems, P.O. BOX 15036, Worcester, MA 16150036

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