A1569: LED Driver with Integrated Hall-Effect Switch

The A1569 is a highly integrated solution that combines a Hall-effect switch with a linear, programmable current regulator, providing up to 150 mA to drive one or more LEDs. With the addition of only two passive components and one or more LEDs, the A1569 forms a complete, magnetically actuated lighting solution that is small, flexible, elegant, easy to design, rugged, and reliable. It is optimized for consumer electronics, white goods, boats, RVs, motorcycles, and interior and auxiliary automotive lighting applications such as glove boxes, center consoles, vanity mirrors, trunks/boots, truck beds, etc.

The LED drive current is set by an external resistor; the LED is then activated by the built-in Hall-effect switch and features an adjustable fade-in/fade-out effect. Omnipolar operation (either north or south pole) and high magnetic sensitivity make the A1569 tolerant of large air gaps and mechanical misalignment. System assembly is easier, as the magnet can be oriented with either pole facing the device. Chopper stabilization provides low switchpoint drift over the operating temperature range. The driver can also be activated via an external input for direct control of the LED.

In addition to contactless operation and safe, constant-current LED drive, reliability is further enhanced with reverse-battery protection, thermal foldback, and automatic shutdown for thermal overload and shorts to ground. The A1569 will prevent damage to the system by removing LED drive current until the short is removed and/or the chip temperature has reduced below the thermal threshold. The driver output is slew-rate-limited to reduce electrical noise during operation.

The device is packaged in an 8-pin SOICN (LJ) with an exposed pad for enhanced thermal dissipation. It is RoHS compliant, with 100% matte-tin leadframe plating.

The A1569K is intented for automotive applications that require extremely wide operating temperature ranges (up to 125ºC) and qualification per AEC-Q100. For other applications, refer to the A1569E.

Arrow Electronics (Distributor, Allegro & Sanken Semiconductors)
25 Hub Drive
Melville, NY 11747
Phone: 1-800-777-2776 for local distributor
Web: www.arrow.com

If this is not your local representative, find your local sales rep here.

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  • Linear LED drive current ≤150 mA set by an external reference resistor
  • High sensitivity, omnipolar Hall-effect switch for LED on/off control
  • Low component count for small size and ease of design
  • Elegant fade-in/fade-out effects with adjustable duration (optional)
  • Qualified per AEC-Q100 for automotive applications (A1569K)
  • Low dropout voltage and low supply current
  • Chopper-stabilized Hall switch
    • Low switchpoint drift over temperature
    • Insensitivity to physical stress
  • Input pin for external LED driver control
  • Slew-rate-limited LED output drive for current transient suppression
  • Ruggedness and reliability
    • Integrated voltage regulator for operation from 7 to 24 V
    • Reverse-battery protection
    • Automatic short-circuit and thermal overload protection and recovery
    • –40ºC to 85ºC ambient temperature range (A1569E)
    • –40ºC to 125ºC ambient temperature range (A1569K)
  • Small 8-pin SOIC package with thermal pad

Click the image to view larger
A1569K Product Image A1569E Product Image Functional Block Diagram Typical Application

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
ASEK1569KLJ-T n/a -20°C to 85°C -- View Data Contact your
local sales rep
Check Stock
A1569ELJTR-T 8-lead SOIC -40°C to 85°C Yes View Data Contact your
local sales rep
Check Stock
A1569KLJTR-T 8-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
Check Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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