Product details

Input voltage (type) DC/DC Topology Buck Vin (Min) (V) 6 Vin (Max) (V) 42 Iout (Max) (A) 1 Iq (Typ) (mA) 0.625 Features Adjustable Switch Frequency, Enable/Shutdown, Integrated Switch, Thermal Shutdown Operating temperature range (C) -40 to 125 Dimming method PWM
Input voltage (type) DC/DC Topology Buck Vin (Min) (V) 6 Vin (Max) (V) 42 Iout (Max) (A) 1 Iq (Typ) (mA) 0.625 Features Adjustable Switch Frequency, Enable/Shutdown, Integrated Switch, Thermal Shutdown Operating temperature range (C) -40 to 125 Dimming method PWM
HSOIC (DDA) 8 19 mm² 4.9 x 3.9 SOIC (D) 8 19 mm² 4.9 x 3.9
  • Integrated 1-A MOSFET
  • VIN Range 6 V to 42 V (LM3404)
  • VIN Range 6 V to 75 V (LM3404HV)
  • 1.2-A Output Current Overtemperature
  • Cycle-by-Cycle Current Limit
  • No Control Loop Compensation Required
  • Separate PWM Dimming and Low Power
    Shutdown
  • Supports All-Ceramic Output Capacitors and
    Capacitor-lessOutputs
  • Thermal Shutdown Protection
  • SOIC-8 Package, SO PowerPAD™-8 Package
  • Integrated 1-A MOSFET
  • VIN Range 6 V to 42 V (LM3404)
  • VIN Range 6 V to 75 V (LM3404HV)
  • 1.2-A Output Current Overtemperature
  • Cycle-by-Cycle Current Limit
  • No Control Loop Compensation Required
  • Separate PWM Dimming and Low Power
    Shutdown
  • Supports All-Ceramic Output Capacitors and
    Capacitor-lessOutputs
  • Thermal Shutdown Protection
  • SOIC-8 Package, SO PowerPAD™-8 Package

The LM3404 and LM3404HV devices are monolithic switching regulators designed to deliver constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting applications, these devices contain a high-side N-channel MOSFET switch with a current limit of 1.5-A (typical) for step-down (Buck) regulators. Hysteretic controlled on-time and an external resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series-parallel connected LED arrays of varying number and type. Some features are: LED dimming using pulse width modulation (PWM), broken or open LED protection, low-power shutdown, and thermal shutdown.

The LM3404 and LM3404HV devices are monolithic switching regulators designed to deliver constant currents to high power LEDs. Ideal for automotive, industrial, and general lighting applications, these devices contain a high-side N-channel MOSFET switch with a current limit of 1.5-A (typical) for step-down (Buck) regulators. Hysteretic controlled on-time and an external resistor allow the converter output voltage to adjust as needed to deliver a constant current to series and series-parallel connected LED arrays of varying number and type. Some features are: LED dimming using pulse width modulation (PWM), broken or open LED protection, low-power shutdown, and thermal shutdown.

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TPS92515 ACTIVE 42-V 2-A LED driver with integrated NFET, high-side current sense, and shunt PWM dimming capable This product is an integrated NFET controlled off-time buck LED driver with power-up output current calibration. It supports input voltage up to 42 V.

Technical documentation

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Type Title Date
* Data sheet LM3404xx 1-A Constant Current Buck Regulator for Driving High Power LEDs datasheet (Rev. G) 29 Sep 2015
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Color the world with what’s next in RGBW LED light source technology – part 1 03 Aug 2017
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 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-1545 LM3404/LM3404HV Evaluation Board (Rev. E) 01 May 2013
User guide AN-1585 LM3402 and LM3404 High Power PSOP-8 Evaluation Board (Rev. C) 01 May 2013
Application note AN-1853 COT Drivers Control LED Ripple Current (Rev. A) 01 May 2013
User guide LM3402/LM3404 Fast Dimming and True Constant LED Current Evaluation Board (Rev. E) 01 May 2013
Application note Thermal Performance of the LM3404/04HV in SO-8 and PSOP-8 Packages (Rev. A) 01 May 2013
Application note AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) 23 Apr 2013
User guide LM3404 Driving a Seoul Semi Zpower P4 1A LED 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

LM3404EVAL — LM3404MA (SOIC) - 1A Constant Current Buck Regulator for HB LEDs (LM3404EVAL Board)

The LM3404/04HV is a buck regulator derived controlled current source designed to drive a series string of high power, high brightness LEDs (HBLEDs) such as the Luxeon™ K2 Emitter at forward currents of up to 1.0A. The board can accept an input voltage ranging from 6V to 42V when using the LM3404 (...)

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Evaluation board

LM3404FSTDIMEV — LM3404FSTDIMEV - Fast Dimming and True Constant LED Current Evaluation Board

The LM3404/04HV are buck regulator derived controlled current sources designed to drive a series string of high power, high brightness LEDs (HBLEDs) at forward currents of up to 1.0A (LM3404/04HV). This evaluation board demonstrates the enhanced thermal performance, fast dimming and true constant (...)

In stock
Limit: 2
Evaluation board

LM3404MREVAL — LM3402 LM3404 High Power PSOP-8 Evaluation board

The LM3402/02HV and LM3404/04HV are buck regulator derived controlled current sources designed to drive a series string of high power, high brightness LEDs (HBLEDs) such as the Luxeon™ K2 Emitter at forward currents of up to 0.5A (LM3402/02HV) or 1.0A (LM3404/04HV). This evaluation board (...)

In stock
Limit: 2
Simulation model

LM3404 PSpice Transient Model

SNVM509.ZIP (82 KB) - PSpice Model
Simulation model

LM3404 TINA-TI Transient Spice Model

SNVM555.ZIP (21 KB) - TINA-TI Spice Model
Simulation model

LM3404 TINA-TI Transient Reference Design

SNVM556.TSC (211 KB) - TINA-TI Reference Design
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 (...)
Reference designs

LM3403-REF — LM3404 Driving a Seoul Semi Zpower P4 1A LED

This demonstration circuit is designed to drive a single Seoul Semiconductor Z-Power P4 LED at a forward current of 1A 10% with a peak-to-peak ripple current of 200 mA or less. The expected forward voltage is 3.8V. The input is a 9V alkaline battery. Switching frequency is 700 kHz 20%.
Package Pins Download
SO PowerPAD (DDA) 8 View options
SOIC (D) 8 View options

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