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Micropower LED driver has integrated Hall-effect switch

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By Julien Happich

A single silicon chip integrates a micropower regulator, a Hall plate, a small-signal amplifier, chopper stabilisation, a Schmitt trigger, open drain Hall-effect switch, output polarity selection, and an 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 and provides very low standby current (25μA). The LED driver features low-noise, adjustable, linear drive of up to 150mA 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 Hall-effect switch is omnipolar (responsive to both North and South magnetic poles) and highly sensitive (BOP = 40G) to support a wide range of mechanical configurations and enclosures with various air-gaps and degrees of mechanical misalignment. The AP13568 features selectable output polarity as well as an open drain output for connecting to additional external circuitry. The on-board micropower regulator permits operation with supply voltages of 7 V to 24 V while providing very low average supply current when the output is disabled.  Reliability and EMC performance are enhanced with Zener clamps, output short-circuit protection, thermal shutdown, and reverse-battery protection. 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”).  ASEK13568KLJA prototype boards are also available.

Allegro MicroSystems – www.allegromicro.com


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