Allegro MicroSystems, Inc.'s Four-Channel Constant Current LED Driver Family

AllegroMicroSystems, Inc. has a new family of constant current LED driversdesigned to address the emerging requirements of the internal and externalillumination applications within the automotive market. Allegro's A6261/A6262/A6264four-channel led driver devices have been fully qualified to the highest levelsof automotive quality standards and robustness.The devices each offer four channels of up to100 mA LED current each, and can be paralleled for higher currents. Theyoperate with a low dropout voltage to minimize power dissipation, and do notrequire any ballast resistors.

The user selected current is provided to four outputswith each output equally sharing the load. The A6261/62/64 family also featuresshort to ground protection which disables the shorted channel allowing theothers to continue to operate. Open LED on any channel is also detected.Similar to the Allegro A6260, the A6261/2/4 family also features a uniquecurrent foldback circuit, which uses the chip junction temperature in order tofoldback the LED current and to protect the IC and LEDs (if mounted inproximity and on the same substrate).

Key automotive applications include (exterior) brake,turn, tail, and rear combination lighting (RCL) as well as (interior) dome,map, and puddle lighting. There is also a commercial grade version of the 6261(suffix E) for consumer lighting applications. The A6261/62/64 devices areoffered in the eMSOP-10 (LY) and eTSSOP-16 (LP) packages.

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