Product details

Input voltage (type) DC/DC Topology Boost, Boost Controller, Buck-Boost Vin (Min) (V) 4.5 Vin (Max) (V) 75 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
Input voltage (type) DC/DC Topology Boost, Boost Controller, Buck-Boost Vin (Min) (V) 4.5 Vin (Max) (V) 75 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
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) 04 Nov 2014
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Here's how body electronics and lighting technology are changing the driving experience 26 Sep 2016
Technical article LED brightness adjustment: high-frequency PWM dimming 26 Aug 2016
Technical article Driving LEDs: topology matters 26 Feb 2016
Technical article Take better selfies with innovative LED flashes 18 Nov 2014
Application note AN-1656 Design Challenges of Switching LED Drivers (Rev. A) 03 May 2013
User guide AN-1969 LM3424 Boost Evaluation Board (Rev. A) 03 May 2013
User guide AN-1985 LM3429 Buck-Boost Evaluation Board (Rev. C) 03 May 2013
User 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 (...)

In stock
Limit: 5
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 (...)

In stock
Limit: 2
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 (...)
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HTSSOP (PWP) 14 View options

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