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LM3429

ACTIVE

Simple N-channel controller for constant current LED drivers

Product details

Input voltage type DC/DC Topology Boost, Boost Controller, Buck-Boost Vin (min) (V) 4.5 Vin (max) (V) 75 Vout (max) (V) 72 Vout (min) (V) 3 Iout (max) (A) 5 Iq (typ) (mA) 1.6 Features Adjustable Switch Frequency, Enable/Shutdown, 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 Boost, Boost Controller, Buck-Boost Vin (min) (V) 4.5 Vin (max) (V) 75 Vout (max) (V) 72 Vout (min) (V) 3 Iout (max) (A) 5 Iq (typ) (mA) 1.6 Features Adjustable Switch Frequency, Enable/Shutdown, Thermal shutdown Operating temperature range (°C) -40 to 125 Dimming method Analog, PWM Number of channels 1 Rating Catalog
HTSSOP (PWP) 14 32 mm² 5 x 6.4
  • LM3429-Q1 is AEC-Q100 Grade 1 Qualified for
    Automotive Applications
  • VIN Range From 4.5 V to 75 V
  • Adjustable Current Sense Voltage
  • High-Side Current Sensing
  • 2-Ω, 1-A Peak MosFET Gate Driver
  • Input Undervoltage Protection
  • Overvoltage Protection
  • PWM Dimming
  • Analog Dimming
  • Cycle-by-Cycle Current Limit
  • Programmable Switching Frequency
  • Low Profile 14-lead HTSSOP Package
  • Thermal Shutdown
  • LM3429-Q1 is AEC-Q100 Grade 1 Qualified for
    Automotive Applications
  • VIN Range From 4.5 V to 75 V
  • Adjustable Current Sense Voltage
  • High-Side Current Sensing
  • 2-Ω, 1-A Peak MosFET Gate Driver
  • Input Undervoltage Protection
  • Overvoltage Protection
  • PWM Dimming
  • Analog Dimming
  • Cycle-by-Cycle Current Limit
  • Programmable Switching Frequency
  • Low Profile 14-lead HTSSOP Package
  • Thermal Shutdown

The LM3429 is a versatile high voltage N-channel MosFET controller for LED drivers. It can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75V, makes the LM3429 ideal for illuminating LEDs in a very diverse, large family of applications.

Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3429 uses Predictive Off-time (PRO) control, which is a combination of peak current-mode control and a predictive off-timer. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation.

The LM3429 includes a high-voltage startup regulator that operates over a wide input range of 4.5 V to 75 V. The internal PWM controller is designed for adjustable switching frequencies of up to 2 MHz, thus enabling compact solutions. Additional features include analog dimming, PWM dimming, overvoltage protection, undervoltage lock-out, cycle-by-cycle current limit, and thermal shutdown.

The LM3429 is a versatile high voltage N-channel MosFET controller for LED drivers. It can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75V, makes the LM3429 ideal for illuminating LEDs in a very diverse, large family of applications.

Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3429 uses Predictive Off-time (PRO) control, which is a combination of peak current-mode control and a predictive off-timer. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation.

The LM3429 includes a high-voltage startup regulator that operates over a wide input range of 4.5 V to 75 V. The internal PWM controller is designed for adjustable switching frequencies of up to 2 MHz, thus enabling compact solutions. Additional features include analog dimming, PWM dimming, overvoltage protection, undervoltage lock-out, cycle-by-cycle current limit, and thermal shutdown.

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Technical documentation

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Type Title Date
* Data sheet LM3429/-Q1 N-Channel Controller for Constant Current LED Drivers datasheet (Rev. H) PDF | HTML 04 Nov 2014
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Driving LEDs: topology matters PDF | HTML 26 Feb 2016
Application note AN-1656 Design Challenges of Switching LED Drivers (Rev. A) 03 May 2013
EVM User's guide AN-1969 LM3424 Boost Evaluation Board (Rev. A) 03 May 2013
EVM User's guide AN-1985 LM3429 Buck-Boost Evaluation Board (Rev. C) 03 May 2013
EVM User's guide AN-1986 LM3429 Boost Evaluation Board (Rev. B) 03 May 2013
Application note AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) 23 Apr 2013
User guide MR16 or PAR38 LED Bulb Ref Design w/the LM3429 LED Driver User Guide 27 Jan 2012

Design & development

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

Evaluation board

LM3429BKBSTEVAL — LM3429 - N-Channel Controller LED Driver Buck-Boost Evaluation Board

This wide range evaluation board showcases the LM3429 NFET controller used with a buck-boost current regulator. It is designed to drive 4 to 8 LEDs at a maximum average LED current of 1A from a DC input voltage of 10 to 70V.

The evaluation board showcases most features of the LM3429 including PWM (...)

User guide: PDF
Not available on TI.com
Evaluation board

LM3429BSTEVAL — LM3429 - N-Channel Controller LED Driver Boost Evaluation Board

This evaluation board showcases the LM3429 NFET controller used with a boost current regulator. It is designed to drive 9 to 12 LEDs at a maximum average LED current of 1A from a DC input voltage of 10 to 26V.

The evaluation board showcases most features of the LM3429 including PWM dimming, (...)

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

LM3429 PSpice Transient Model (Rev. C)

SNVM655C.ZIP (114 KB) - PSpice Model
Simulation model

LM3429 TINA-TI Transient Reference Design

SNVM656.TSC (2199 KB) - TINA-TI Reference Design
Simulation model

LM3429 TINA-TI Transient Spice Model

SNVM657.ZIP (12 KB) - TINA-TI Spice 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 (...)
Package Pins CAD symbols, footprints & 3D models
HTSSOP (PWP) 14 Ultra Librarian

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