A6270-1: High-Current, Two-Channel, Automotive LED Controller

Description

The A6270-1 is a linear, programmable current controller capable of accurately regulating LED current in two strings with external MOSFETs. The LED current can be switched between high current and low current for Stop/Tail or DRL/position applications. The two LED current levels from each output are set by two sense resistors. Current reference accuracy for each string current is better than ±4%.

Driving LEDs with constant current ensures safe operation with maximum possible light output. ICs can be connected in parallel in a master-slave arrangement for larger lighting applications.

Drain short-to-ground detection is provided for both external MOSFETs. The A6270-1 also offers MOSFET drain short-to- VIN and open LED fault protection. The MODE pin controls the action of the IC in case of a fault.

A temperature monitor is included to reduce the LED drive current if the chip temperature exceeds a thermal threshold.

An input voltage monitor is included to reduce LED current if VIN rises above 17 V. The device package is a 16-pin TSSOP (LP), with exposed pad for enhanced thermal dissipation. The package is lead (Pb) free, with 100% matte-tin leadframe plating.

Top Features

  • AEC-Q100 qualified
  • 5.3 to 40 V supply; operates down to 5.1 V, when enabled
  • LED current programmed independently with two external MOSFETs
  • Flexible LED dimming options
    • Integrated PWM dimming set by resistors
    • External PWM dimming set by microcontroller
    • Analog voltage control for PWM dimming
  • Current slew rate limit during PWM dimming
  • LED current derating for elevated VIN
  • LED current derating for elevated junction temperature
  • Low regulation voltage for low power dissipation
  • Extensive fault detection and protection
    • Drain short-to-ground detection
    • Drain short-to-VIN, open LED, VIN undervoltage, and thermal protection
  • Parallel IC operation for higher number of strings with good matching

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A6270KLPTR-T-1 16-lead TSSOP -40°C to 125°C Yes View Data Contact your
local sales rep
Check
Distributor 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.

Packaging

A6270-1 Package