Allegro - A6274/A6284

The A6274 and A6284 are programmable linear current regulator
ICs for driving automotive LED arrays. The LED current is programmed by
external resistors. These devices sink up to 60 mA (A6274) or 120 mA (A6284),
from each of six LED pins, to drive strings of high-brightness LEDs. LED pins
can be paralleled to drive even higher current LED strings. Current settings
are typically accurate to 2%, while typical matching between LED strings is
0.8%. LED light output can be adjusted by PWM dimming. The ICs provide an
internal PWM dimming circuit that is programmed by external resistors for PWM
frequency and duty cycle. It can also accept an external PWM signal. Multiple
ICs can be configured in parallel for larger lighting systems. An internal FULL
(VDR > 3.6 V) option is provided to override the PWM dimming ratio for full
LED current. LED current derating with temperature and programmable VIN levels
allows operation over a wide range of operating conditions.