Allegro MicroSystems, LLC has released reportedly the world’s first LED driver IC that features an integrated Hall-effect switch. The A1569 enables compact, reliable and fault-tolerant LED lighting with minimal electrical engineering and low component-count and cost.
The single silicon chip integrates a Hall plate, a small-signal amplifier, chopper stabilization, a Schmitt trigger, and a LED driver with soft on/off and short-circuit and thermal protection with automatic recovery. The integrated solid-state Hall-effect switch supports silent, sealed, contactless activation and offers a significant upgrade from failure-prone mechanical switches.
The LED driver features low-noise, adjustable, linear drive of up to 150 mA into one or more LEDs. An optional external capacitor programs the turn-on/turn-off rate, adding an elegant “theater” effect. It is controlled by the Hall-effect switch and turns on and off in response to a magnet. The omnipolar Hall-effect switch is highly sensitive to support a wide range of mechanical configurations and enclosures with various air gaps and degrees of mechanical misalignment.
The device is available in two versions: the “K” option is an automotive-grade (AEC-Q100) device that operates from –40 °C to +125 °C; the “E” option is for industrial and consumer applications that operate from –40°C to 85°C. Both versions feature a RoHS-compliant, thermally enhanced SOIC-8 surface-mount package (designator “LJ”).
In quantities of 1,000, list price is 85 cents each for the A1569KLJTR-T and 68 cents for the A1569ELJTR-T.