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

ALT80800 Datasheet

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Documentation and Resources

Description

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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

16-Pin eTSSOP (suffix LP)

LP Package Documentation

Part Number Specifications and Availability

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	Samples	Part Number	Market	Topology	Operating Input Voltage Min (V)	Operating Input Voltage Max (V)	Number of Channels	IOUT Per Channel (mA)	IOUT Total (Ma)	Temperature	Package	Part Composition / RoHS Data	Check Stock	ECAD
		ALT80800KLPATR	Automotive	Buck	4.5	55	1	2000	2000	-40°C to 125°C	16-Pin TSSOP	View Data	Check Distributor Stock
		ALT80800KLPATR	Automotive	Buck	4.5	55	1	2000	2000	-40°C to 125°C	16-Pin TSSOP	View Data	Check Distributor Stock

Part Number	Market	Topology	Operating Input Voltage Min (V)	Operating Input Voltage Max (V)	Number of Channels	IOUT Per Channel (mA)	IOUT Total (Ma)	Temperature	Package
ALT80800KLPATR	Automotive	Buck	4.5	55	1	2000	2000	-40°C to 125°C	16-Pin TSSOP
ALT80800KLPATR	Automotive	Buck	4.5	55	1	2000	2000	-40°C to 125°C	16-Pin TSSOP

Documentation and Resources

Documentation

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All Types Application Note Selection Guide

Documents Found: 2

Document Type	Document Name
Application Note	Design Considerations in Selection of Converter Configuration for Automotive LED Headlight Applications
Selection Guide	Allegro Product Selection Guide