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Product details

Parameters

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 open-in-new Find other Illumination LED drivers

Package | Pins | Size

HTSSOP (PWP) 14 32 mm² 5 x 6.4 open-in-new Find other Illumination LED drivers

Features

  • 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
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Description

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) Nov. 04, 2014
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical article Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical article LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
Technical article Driving LEDs: topology matters Feb. 26, 2016
Technical article Take better selfies with innovative LED flashes Nov. 18, 2014
Application note AN-1656 Design Challenges of Switching LED Drivers (Rev. A) May 03, 2013
User guide AN-1969 LM3424 Boost Evaluation Board (Rev. A) May 03, 2013
User guide AN-1985 LM3429 Buck-Boost Evaluation Board (Rev. C) May 03, 2013
User guide AN-1986 LM3429 Boost Evaluation Board (Rev. B) May 03, 2013
Application note AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) Apr. 23, 2013
User guide MR16 or PAR38 LED Bulb Ref Design w/the LM3429 LED Driver User Guide Jan. 27, 2012

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
99
Description

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 (...)

EVALUATION BOARD Download
document-generic User guide
99
Description

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 (...)

Design tools & simulation

SIMULATION MODEL Download
SNVM655C.ZIP (114 KB) - PSpice Model
SIMULATION MODEL Download
SNVM656.TSC (2199 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVM657.ZIP (12 KB) - TINA-TI Spice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
CAD/CAE SYMBOL Download
SNVC030.ZIP (1219 KB)

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 14 View options

Ordering & quality

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  • Ongoing reliability monitoring

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