Product details

Input voltage (type) DC/DC Topology Buck Vin (Min) (V) 6 Vin (Max) (V) 42 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
Input voltage (type) DC/DC Topology Buck Vin (Min) (V) 6 Vin (Max) (V) 42 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
HVSSOP (DGQ) 10 9 mm² 3 x 3
  • 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

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 point (...)

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Simulation model

LM3409 PSpice Transient Model

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

LM3409-Q1 PSpice Transient Model

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

LM3409 TINA-TI Transient Spice Model

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

LM3409 TINA-TI Transient Reference Design

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

PMP8531 — Universal Current Limiter based on a LED driver

This design is a current limiter based on a LED driver. It can be used for various applications and changed easily to a different current limit. PMP8531 uses LM3409 buck controller. An excel spreadsheet shows two different configurations (current source or eletrical fuse) and helps the designer to (...)
Reference designs

PMP7761 — 24V input to 14V@6A, Non Sync Buck LED Driver

It is a High current Non Synchronous buck DC-DC LED driver. The LM3409 uses 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 (...)
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PMP7757 — Non sync buck controller with 32 to 36V input and 29.2V @ 6A output

PMP7757 is a non-synchronous buck controller with 32V to 36V DC input and 29.2V@ 6A output.
Reference designs

PMP7755 — Non sync buck controller with 24V input and 18V @ 4.2A output

PMP7755 is a non-synchronous buck controller for LM3409 with 24V DC input and 18V output @ 4.2A. The load is 9 strings with 6 LEDs per string. It uses a motion detector with PIR (passive infarared) dimming as well as 0-10V analog dimming. It has differential high side current sensing which enables (...)
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HVSSOP (DGQ) 10 View options

Ordering & quality

Information included:
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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
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  • Qualification summary
  • Ongoing reliability monitoring

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