LTM8040 - 36V, 1A μModule (Power Module) LED Driver and Current Source

The LTM8040 is a fixed frequency 1A step-down DC/DC μModule (power module) regulator designed to operate as a constant current source. Internal circuitry monitors the output current to provide accurate current regulation, which is ideal for driving high current LEDs. High output current accuracy is maintained over a wide current range, from 35mA to 1A, allowing a wide dimming range over an output voltage range of 2.5V to 13V. Unique PWM circuitry allows a dimming range of 250:1, avoiding the color shift normally associated with LED current dimming. With its wide input range of 4V to 36V, the LTM8040 regulates a broad array of power sources, from 4-cell batteries and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed power supplies. The LTM8040 is packaged in a thermally enhanced, compact (15mm × 9mm × 4.32mm) molded Land Grid Array (LGA) package suitable for automated assembly by standard surface mount equipment. The LTM8040 is Pb-free and RoHS compliant.

  • True Color PWM Delivers Constant Color with 250:1 Dimming Ratio
  • Wide Input Range: 4V to 36V
  • Up to 1A LED Current
  • Adjustable Control of LED Current
  • High Output Current Accuracy is Maintained Over a Wide Range from 35mA to 1A
  • Open LED and Short-Circuit Protection
  • Grounded LED Cathode Connection
  • Small Footprint (15mm × 9mm × 4.32mm) Surface Mount LGA Package
Typical Application
LTM8040 Typical Application
LTM8040 Typical Application
  • Automotive and Avionic Lighting
  • Architectural Detail Lighting
  • Display Backlighting
  • Constant Current Sources
LTM8040 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTM8040EV#PBF15mm × 9mm × 4.32mm LGAE$11.31$7.45
LTM8040IV#PBF15mm × 9mm × 4.32mm LGAI$12.45$8.20
Demo Boards
Part NumberDescriptionPrice
DC1274ALTM8040EV Demo Board | µModule Buck LED Driver, 4V ≤ VIN ≤ 36V, VLED up to 13V @ 1A$65.00
Design Note
Reliability Data
LT Journal
Press Release
CAD Symbol
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LTM8040 Footprints and Symbols
LTM8040 Demo Circuit - 36V, 1A Step-Down LED Driver (12V to 2x 3.4V LEDs @ 1A)