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LM3409

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42-V PFET buck controller for high power LED drives

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Data sheet

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TPS922055 ACTIVE 65-V, 4-A buck LED driver with inductive fast dimming and spread spectrum New device with inductive fast dimming and spread spectrum

LM3409

ACTIVE
Data sheet Order now

Product details

Input voltage type DC/DC Topology Buck Vin (min) (V) 6 Vin (max) (V) 42 Vout (max) (V) 42 Vout (min) (V) 1.24 Iout (max) (A) 5 Iq (typ) (mA) 2 Features Adjustable Switch Frequency, Enable/Shutdown, Precision Dimming Control, Thermal shutdown Operating temperature range (°C) -40 to 125 Dimming method Analog, PWM Number of channels 1 Rating Catalog
Input voltage type DC/DC Topology Buck Vin (min) (V) 6 Vin (max) (V) 42 Vout (max) (V) 42 Vout (min) (V) 1.24 Iout (max) (A) 5 Iq (typ) (mA) 2 Features Adjustable Switch Frequency, Enable/Shutdown, Precision Dimming Control, Thermal shutdown Operating temperature range (°C) -40 to 125 Dimming method Analog, PWM Number of channels 1 Rating Catalog
PDIP (NFF) 14 158.4268 mm² (19.18 mm × 8.26 mm) HVSSOP (DGQ) 10 14.7 mm² (3 mm × 4.9 mm)
  • LM3409-Q1 and LM3409HV-Q1 are Automotive Grade Products: AEC-Q100 Grade 1 Qualified
  • 2-Ω, 1-A Peak MOSFET Gate Drive
  • VIN Range: 6 V to 42 V (LM3409, LM3409-Q1)
  • VIN Range: 6 V to 75 V (LM3409HV, LM3409HV-Q1)
  • Differential, High-Side Current Sense
  • Cycle-by-Cycle Current Limit
  • No Control Loop Compensation Required
  • 10,000:1 PWM Dimming Range
  • 250:1 Analog Dimming Range
  • Supports All-Ceramic Output Capacitors and Capacitor-less Outputs
  • Low-Power Shutdown and Thermal Shutdown
  • Thermally Enhanced 10-Pin, HVSSOP Package
  • LM3409-Q1 and LM3409HV-Q1 are Automotive Grade Products: AEC-Q100 Grade 1 Qualified
  • 2-Ω, 1-A Peak MOSFET Gate Drive
  • VIN Range: 6 V to 42 V (LM3409, LM3409-Q1)
  • VIN Range: 6 V to 75 V (LM3409HV, LM3409HV-Q1)
  • Differential, High-Side Current Sense
  • Cycle-by-Cycle Current Limit
  • No Control Loop Compensation Required
  • 10,000:1 PWM Dimming Range
  • 250:1 Analog Dimming Range
  • Supports All-Ceramic Output Capacitors and Capacitor-less Outputs
  • Low-Power Shutdown and Thermal Shutdown
  • Thermally Enhanced 10-Pin, HVSSOP Package

The LM3409, LM3409-Q1, LM3409HV, and LM3409HV-Q1 are P-channel MOSFET (PFET) controllers for step-down (buck) current regulators. They offer wide input voltage range, high-side differential current sense with low adjustable threshold voltage and fast output enable/disable function and a thermally enhanced 10-pin, HVSSOP package. These features combine to make the LM3409 family of devices ideal for use as constant current sources for driving LEDs where forward currents up to 5 A are easily achievable.

The LM3409 devices use constant off-time (COFT) control to regulate an accurate constant current without the need for external control loop compensation. Analog and PWM dimming are easy to implement and result in a highly linear dimming range with excellent achievable contrast ratios. Programmable UVLO, low-power shutdown, and thermal shutdown complete the feature set.

For all available packages, see the orderable addendum at the end of the data sheet.

The LM3409, LM3409-Q1, LM3409HV, and LM3409HV-Q1 are P-channel MOSFET (PFET) controllers for step-down (buck) current regulators. They offer wide input voltage range, high-side differential current sense with low adjustable threshold voltage and fast output enable/disable function and a thermally enhanced 10-pin, HVSSOP package. These features combine to make the LM3409 family of devices ideal for use as constant current sources for driving LEDs where forward currents up to 5 A are easily achievable.

The LM3409 devices use constant off-time (COFT) control to regulate an accurate constant current without the need for external control loop compensation. Analog and PWM dimming are easy to implement and result in a highly linear dimming range with excellent achievable contrast ratios. Programmable UVLO, low-power shutdown, and thermal shutdown complete the feature set.

For all available packages, see the orderable addendum at the end of the data sheet.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LM3409, -Q1, LM3409HV, -Q1 P-FET Buck Controller for High-Power LED Drivers datasheet (Rev. L) PDF | HTML May 23, 2016
Technical article Dimming in switched-mode LED drivers PDF | HTML Aug 13, 2018
Selection guide Power Management Guide 2018 (Rev. R) Jun 25, 2018
White paper LED Drivers for Automotive Exterior Applications (Rev. B) Mar 27, 2018
Technical article Color the world with what’s next in RGBW LED light source technology – part 2 PDF | HTML Aug 16, 2017
Technical article Color the world with what’s next in RGBW LED light source technology – part 1 PDF | HTML Aug 3, 2017
Technical article LED brightness adjustment: high-frequency PWM dimming PDF | HTML Aug 26, 2016
Application note AN-1656 Design Challenges of Switching LED Drivers (Rev. A) May 3, 2013
User guide AN-1954 LM3409 Demonstration Board (Rev. D) May 1, 2013
Application note AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) Apr 23, 2013
Application note Dimming Techniques for Switched-Mode LED Drivers Jul 30, 2009

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM3409EVAL — LM3409 demonstration board

This demonstration board showcases the LM3409 PFET controller for a buck current regulator. It is designed to drive 4 LEDs (VO = 15V) at a maximum average LED current (ILED = 1A) from a DC input voltage (VIN = 24V). The switching frequency (fSW = 525 kHz) is targeted for the nominal operating (...)

Supported products & hardware
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Simulation model

LM3409 PSpice Transient Model

SNVM064.ZIP (74 KB) - PSpice model
Supported products & hardware
Simulation model

LM3409 TINA-TI Transient Reference Design

SNVM421.TSC (580 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

LM3409 TINA-TI Transient Spice Model

SNVM420.ZIP (14 KB) - TINA-TI Spice model
Supported products & hardware
Simulation model

LM3409-Q1 PSpice Transient Model

SNVM350.ZIP (69 KB) - PSpice model
Supported products & hardware
Reference design

PMP6024 — 100-240VAC Input, 60W, 2-string, PWM Dimmable LED Driver Reference Design

PMP6024 is an offline, LED driver circuit consisting of an isolated, power-factor corrected, constant output voltage flyback converter followed by two DC/DC buck LED current controllers.  It is suitable for indoor or outdoor area lighting applications of 3500-5000 lumens (depending upon LED (...)

Supported products & hardware
Reference design

TIDA-01415 — 100-W, High-Resolution, 16-bit Color-Tunable, 0.15% Dimmable RGBW LED Luminaire Reference Design

This reference design demonstrates the finest range of color control of individual RGBW LED strings with > 16 bits of PWM resolution while supporting the PWM modulation frequencies as high as 30 and 50 kHz. This reference design demonstrates the finest range of individual RGBW LED strings color (...)
Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
PDIP (NFF) 14 Ultra Librarian
HVSSOP (DGQ) 10 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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