A6267 Automotive High Current LED Controller

The A6267 is a DC-to-DC converter controller, providing a programmable constant current output for driving high power LEDs in series. Driving the LEDs in series ensures identical currents and uniform brightness. For automotive applications, optimum performance is achieved when driving up to 15 LEDs at currents up to 1 A.

The A6267 provides a cost-effective solution using an external logic-level MOSFET and minimum additional external components. The maximum LED current is set with a single external sense resistor and can be modified using a current reference input. Direct PWM control is possible via the Enable input, which also provides a shutdown mode.

This DC-DC converter can be configured as a ground-referenced boost converter or as a supply-referenced boost converter providing buck-boost capability. The buck-boost topology used ensures that there is no leakage path through the LEDs when in shutdown and no inrush current at power-up.

Integrated diagnostics and two fault outputs give indication of undervoltage, chip overtemperature, output open circuit, LED short circuit and LED undercurrent, and can be configured to provide short to supply and short to ground protection for the LED connections. A unique feature is the ability to detect one or more shorted LEDs.

The device is provided in a 16-pin TSSOP package with exposed thermal pad (suffix LP). It is lead (Pb) free, with 100% matte tin leadframe plating.

Applications

  • Automotive high power LED lighting systems
  • Fog lights, reversing lights, daytime running lights
  • Headlights

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  • AEC Q100 Grade 0 Automotive Qualified
  • Constant current LED drive
  • 6.5 to 50 V supply
  • Boost or buck-boost modes
  • Drives up to 15 LEDs in series
  • Programmable switching frequency 100 to 700 kHz
  • Open LED overvoltage indication and protection
  • Single and multiple LED short indication
  • LED short to ground and supply protection
  • PWM dimming control
  • 10 µA shutdown current including LED leakage

The device is provided in a 16-pin TSSOP package with exposed thermal pad (suffix LP). It is lead (Pb) free, with 100% matte tin leadframe plating.

Package

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Product Image Functional Block Diagram Typical Application

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A6267KLPTR-T 16-lead TSSOP -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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