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LM3424-Q1

ACTIVE

Automotive constant current N-channel controller with Thermal Foldback for driving LEDs

Product details

Number of channels 1 Topology Boost Controller, Buck-Boost Controller, SEPIC Controller Rating Automotive Operating temperature range (°C) -40 to 125 Vin (min) (V) 4.5 Vin (max) (V) 75 Vout (min) (V) 3 Vout (max) (V) 72 Iout (max) (A) 5 Iq (typ) (mA) 2 Switching frequency (max) (kHz) 2000 Features Adjustable Switch Frequency, Enable/Shutdown, Power good, Soft Start, Synchronization Pin, Thermal shutdown
Number of channels 1 Topology Boost Controller, Buck-Boost Controller, SEPIC Controller Rating Automotive Operating temperature range (°C) -40 to 125 Vin (min) (V) 4.5 Vin (max) (V) 75 Vout (min) (V) 3 Vout (max) (V) 72 Iout (max) (A) 5 Iq (typ) (mA) 2 Switching frequency (max) (kHz) 2000 Features Adjustable Switch Frequency, Enable/Shutdown, Power good, Soft Start, Synchronization Pin, Thermal shutdown
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • AEC Qualified for automotive applications
    • Device temperature grade 1: −40°C ≤ TA ≤ 125°C
  • 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
  • AEC Qualified for automotive applications
    • Device temperature grade 1: −40°C ≤ TA ≤ 125°C
  • 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

The LM3424-Q1 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-Q1 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-Q1 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-Q1 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-Q1 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.

The LM3424-Q1 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-Q1 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-Q1 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-Q1 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-Q1 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-Q1 Constant Current N-channel Controller with Thermal Foldback For Driving LEDs datasheet PDF | HTML 31 Jul 2019
White paper LED Drivers for Automotive Exterior Applications (Rev. B) 27 Mar 2018
Technical article Lighting the road ahead: LEDs in automotive front lighting PDF | HTML 29 Sep 2016
Application note AN-1656 Design Challenges of Switching LED Drivers (Rev. A) 03 May 2013
EVM User's guide AN-1967 LM3424 Buck-Boost Evaluation Board (Rev. A) 03 May 2013
EVM User's guide AN-1969 LM3424 Boost Evaluation Board (Rev. A) 03 May 2013
Application note AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) 23 Apr 2013
User guide Ambient Light Adaptive LED Driver User Guide 27 Jan 2012

Design & development

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Evaluation board

LM3424BKBSTEVAL — LM3424 Buck-Boost Evaluation Board

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 (...)

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

LM3424BSTEVAL — LM3424 Boost Evaluation Board

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, (...)

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

LM3424 PSpice Transient Model

SNVMA72.ZIP (102 KB) - PSpice Model
CAD/CAE symbol

Ambient Light Adaptive LED Driver CAD Files

SNVC025.ZIP (123 KB)
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) 20 Ultra Librarian

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