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LM3409

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42-V PFET buck controller for high power LED drives

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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
HVSSOP (DGQ) 10 14.7 mm² 3 x 4.9 PDIP (NFF) 14 158.4268 mm² 19.18 x 8.26
  • 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) controllersfor step-down (buck) current regulators. They offer wide input voltage range, high-sidedifferential current sense with low adjustable threshold voltage and fast output enable/disablefunction 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 currentsup to 5 A are easily achievable.

The LM3409 devices use constant off-time (COFT) control to regulate an accurate constantcurrent without the need for external control loop compensation. Analog and PWM dimming are easy toimplement 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) controllersfor step-down (buck) current regulators. They offer wide input voltage range, high-sidedifferential current sense with low adjustable threshold voltage and fast output enable/disablefunction 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 currentsup to 5 A are easily achievable.

The LM3409 devices use constant off-time (COFT) control to regulate an accurate constantcurrent without the need for external control loop compensation. Analog and PWM dimming are easy toimplement 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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Type Title Date
* Data sheet LM3409, -Q1, LM3409HV, -Q1 P-FET Buck Controller for High-Power LED Drivers datasheet (Rev. L) PDF | HTML 23 May 2016
Technical article Dimming in switched-mode LED drivers PDF | HTML 13 Aug 2018
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
White paper LED Drivers for Automotive Exterior Applications (Rev. B) 27 Mar 2018
Technical article Color the world with what’s next in RGBW LED light source technology – part 2 PDF | HTML 16 Aug 2017
Technical article Color the world with what’s next in RGBW LED light source technology – part 1 PDF | HTML 03 Aug 2017
Technical article LED brightness adjustment: high-frequency PWM dimming PDF | HTML 26 Aug 2016
Application note AN-1656 Design Challenges of Switching LED Drivers (Rev. A) 03 May 2013
EVM User's guide AN-1953 LM3409HV Evaluation Board (Rev. D) 01 May 2013
User guide AN-1954 LM3409 Demonstration Board (Rev. D) 01 May 2013
Application note AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) 23 Apr 2013
Application note Dimming Techniques for Switched-Mode LED Drivers 30 Jul 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 (...)

User guide: PDF
Not available on TI.com
Simulation model

LM3409 PSpice Transient Model

SNVM064.ZIP (74 KB) - PSpice Model
Simulation model

LM3409 TINA-TI Transient Reference Design

SNVM421.TSC (580 KB) - TINA-TI Reference Design
Simulation model

LM3409 TINA-TI Transient Spice Model

SNVM420.ZIP (14 KB) - TINA-TI Spice Model
Simulation model

LM3409-Q1 PSpice Transient Model

SNVM350.ZIP (69 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Reference designs

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 (...)
Design guide: PDF
Schematic: PDF
Reference designs

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 (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
HVSSOP (DGQ) 10 Ultra Librarian
PDIP (NFF) 14 Ultra Librarian

Ordering & quality

Information included:
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Information included:
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