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

The ALT80800 is a compact, high-efficiency, low EMI LED Driver forautomotive 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.

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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

• 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)