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LM3444

ACTIVE

AC-DC offline LED driver

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Data sheet

LM3444

ACTIVE
Data sheet Order now

Product details

Input voltage type AC/DC Topology Buck, Flyback Vin (min) (V) 8 Vin (max) (V) 13 Vout (max) (V) 60 Vout (min) (V) 9 Iout (max) (A) 2 Iq (typ) (mA) 1.58 Features Adjustable Switch Frequency, Thermal shutdown Operating temperature range (°C) -40 to 125 Dimming method Analog Number of channels 1 Rating Catalog
Input voltage type AC/DC Topology Buck, Flyback Vin (min) (V) 8 Vin (max) (V) 13 Vout (max) (V) 60 Vout (min) (V) 9 Iout (max) (A) 2 Iq (typ) (mA) 1.58 Features Adjustable Switch Frequency, Thermal shutdown Operating temperature range (°C) -40 to 125 Dimming method Analog Number of channels 1 Rating Catalog
VSSOP (DGS) 10 14.7 mm² (3 mm × 4.9 mm) SOIC (D) 8 29.4 mm² (4.9 mm × 6 mm)
  • Application Voltage Range: 80 VAC to 277 VAC
  • Capable of Controlling LED Currents
    Greater than 1 A
  • Adjustable Switching Frequency
  • Low Quiescent Current
  • Adaptive Programmable Off-Time Allows for
    Constant Ripple Current
  • Thermal Shutdown
  • No Flicker at 120 Hz
  • Low-Profile 10-Pin VSSOP Package
    or 8-Lead SOIC Package
  • Patented Drive Architecture
  • Application Voltage Range: 80 VAC to 277 VAC
  • Capable of Controlling LED Currents
    Greater than 1 A
  • Adjustable Switching Frequency
  • Low Quiescent Current
  • Adaptive Programmable Off-Time Allows for
    Constant Ripple Current
  • Thermal Shutdown
  • No Flicker at 120 Hz
  • Low-Profile 10-Pin VSSOP Package
    or 8-Lead SOIC Package
  • Patented Drive Architecture

The LM3444 is an adaptive constant off-time AC/DC buck (step-down) constant current controller that provides a constant current for illuminating high power LEDs. The high-frequency capable architecture allows the use of small external passive components. A passive PFC circuit ensures good power factor by drawing current directly from the line for most of the cycle, and provides a constant positive voltage to the buck regulator. Additional features include thermal shutdown, current limit and VCC undervoltage lockout. The LM3444 is available in a low profile 10-pin VSSOP package or an 8-lead SOIC package.

The LM3444 is an adaptive constant off-time AC/DC buck (step-down) constant current controller that provides a constant current for illuminating high power LEDs. The high-frequency capable architecture allows the use of small external passive components. A passive PFC circuit ensures good power factor by drawing current directly from the line for most of the cycle, and provides a constant positive voltage to the buck regulator. Additional features include thermal shutdown, current limit and VCC undervoltage lockout. The LM3444 is available in a low profile 10-pin VSSOP package or an 8-lead SOIC package.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LM3444 AC-DC Offline LED Driver datasheet (Rev. D) PDF | HTML Dec 31, 2015
White paper Common LED Functions and LED Driver Design Considerations Sep 21, 2020
Selection guide Power Management Guide 2018 (Rev. R) Jun 25, 2018
Application note AN-1656 Design Challenges of Switching LED Drivers (Rev. A) May 3, 2013
Application note AN-2097 LM3444 - 230VAC, 8W Isolated Flyback LED Driver (Rev. F) May 1, 2013
Application note AN-2082 LM3444 -120VAC, 8W Isolated Flyback LED Driver (Rev. E) May 1, 2013
User guide AN-2083 LM3444 A19 Edison Retrofit Evaluation Board (Rev. C) May 1, 2013
Application note An Improved Line Regulation Solution Used in LM3444/5 Non-Isolated LED Lighting Oct 25, 2012
User guide LM3444 MR16 Buck-Boost Reference Design (Rev. A) Feb 17, 2012
User guide LM3444 MR16 Boost Reference Design User Guide (Rev. A) Feb 13, 2012

Design & development

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Package Pins CAD symbols, footprints & 3D models
VSSOP (DGS) 10 Ultra Librarian
SOIC (D) 8 Ultra Librarian
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