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

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