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These parts are in production but have been determined to be NOT FOR NEW DESIGN

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

ALT80800

ALT80800 Product Image

These parts are in production but have been determined to be NOT FOR NEW DESIGN.

This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Date of status change: November 4, 2024.

We recommend the A80800 as a replacement part.

ALT80800 ECAD Model
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Description

Top Features

Typical Applications

Packaging

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)

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

16-Pin eTSSOP (suffix LP)

LP Package Documentation

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Part Number Specifications and Availability

Documentation and Resources

Documentation

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All Types Application Note Guide
Documents Found: 32
Document Type Document Name
Application Note
Design Considerations in Selection of Converter Configuration for Automotive LED Headlight Applications
Guide
ALT80800 Evaluation Board User Guide