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Product details

Parameters

Input voltage (type) DC/DC Topology Boost, Boost Controller, Buck-Boost, Sepic Vin (Min) (V) 4.5 Vin (Max) (V) 75 Iout (Max) (A) 5 Iq (Typ) (mA) 2 Features Adjustable Switch Frequency, Enable/Shutdown, Power Good, Soft Start, Synchronization Pin, 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) 20 42 mm² 6.5 x 6.4 open-in-new Find other Illumination LED drivers

Features

  • VIN range from 4.5 V to 75 V
  • High-side adjustable current sense
  • 2-Ω, 1-A peak MOSFET gate driver
  • Input undervoltage and output overvoltage protection
  • PWM and analog dimming
  • Cycle-by-cycle current limit
  • Programmable soft-start and slope compensation
  • Programmable, synchronizable switching frequency
  • Programmable thermal foldback
  • Precision voltage reference
  • Low-power shutdown and thermal shutdown
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Description

The LM3424 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. In addition, the LM3424 includes a thermal foldback feature for temperature management of the LEDs. This flexibility, along with an input voltage rating of 75 V, makes the LM3424 ideal for illuminating LEDs in a large family of applications.

Adjustable high-side current sense allows for tight regulation of the LED current with the highest efficiency possible. The LM3424 uses standard peak current-mode control providing inherent input voltage feed-forward compensation for better noise immunity. It is designed to provide accurate thermal foldback with a programmable foldback breakpoint and slope. In addition, a 2.45V reference is provided.

The LM3424 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 2.0 MHz and external synchronization is possible. The controller is capable of high speed PWM dimming and analog dimming.

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Technical documentation

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Type Title Date
* Data sheet LM3424 Constant Current N-channel Controller with Thermal Foldback For Driving LEDs datasheet (Rev. D) Jul. 31, 2019
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-1967 LM3424 Buck-Boost Evaluation Board (Rev. A) May 03, 2013
User guide AN-1969 LM3424 Boost Evaluation Board (Rev. A) May 03, 2013
Application note AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) Apr. 23, 2013
User guide Ambient Light Adaptive 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
149
Description

This wide range evaluation board showcases the LM3424 NFET controller used with a buck-boost current regulator. It is designed to drive 4 to 10 LEDs at a maximum average LED current of 1A from a DC input voltage of 10 to 70V. The evaluation board showcases many of the LM3424 features including (...)

EVALUATION BOARD Download
document-generic User guide
149
Description

This evaluation board showcases the LM3424 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 many of the LM3424 features including thermal foldback (...)

Design tools & simulation

SIMULATION MODEL Download
SNVMA72.ZIP (102 KB) - PSpice 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
SNVC025.ZIP (123 KB)

Reference designs

REFERENCE DESIGNS Download
Ambient Light Adaptive LED Driver
AMBIENTLIGHTADAPTIVELED-REF The ambient light adaptive LED driver automatically adjusts display brightness for changing ambient light conditions, providing a more viewable display with better contrast. The design drives five series connected LEDs from an input voltage of 4.5V to 12V. The LED current is nominally 100mA and the (...)
REFERENCE DESIGNS Download
6V-33V input to 16.7V output@1.75A, Buck Boost Converter
PMP7759 — It is a Buck Boost configuration where input ranges from 6V to 33V DC. The output has 5 LEDs in the string producing 16.7V in the output. It uses NTC for thermal shutdown thereby protecting the circuit in case of high temperature issues. It can be used in Indoor and Outdoor area SSL, Automotive (...)
Design files

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options

Ordering & quality

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  • MSL rating/Peak reflow
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  • Ongoing reliability monitoring

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