ALT80800: Automotive-Grade, Constant-Current 2.0 A PWM Dimmable Synchronous Buck LED Driver

ALT80800 Product Image


Top Features

The ALT80800 is a compact, high-efficiency, low EMI LED Driver for automotive lighting applications. It is a synchronous buck switching regulator that provides constant-current output to drive high-power LEDs. It integrates both high-side and low-side N-channel DMOS switches for DC-to-DC step-down conversion. Output current is user-selectable by an external current sense resistor, and output voltage is automatically adjusted to drive various numbers of LEDs in a single string.

  • 55Vin rating (60V abs max) – Can be used on traditional 12-V automotive, and 24-V trucks, and systems using a pre-boost supply followed by the ALT80800 to drive a high number of LEDs
  • Integrated FETs – No need for external FET(s) or Diode as part of the buck conversion, and higher efficiency
  • Switching frequency dithering for EMI reduction – pass OEM requirements and minimize associated components
  • 5V Vcc can be used to source up to 14mA as a local rail (e.g., power a small uC) – potentially eliminate an LDO
  • PWM and Analog dimming options, including control for NTC temperature foldback or LED binning
  • Adjustable LED open fault mask setting for low VIN operation (dropout mode)

Typical Applications:

Automotive Lighting

  • Hi/Lo Beam and Matrix Headlights
  • Front and Rear Fog Lights
  • Daytime Running Lights
  • Turn/stop Lights
  • Dimmable Interior Lights
  • Other Automotive Lighting Applications

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
ALT80800KLPATR 16-lead TSSOP -40°C to 125°C Yes View Data Contact your
local sales rep
Distributor Stock
APEK80800KLP-01-MH DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
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.

Allegro 16-Pin LP package


16-Pin eTSSOP (suffix LP)

LP Package Documentation