Product details


Input voltage (type) DC/DC Vin (Min) (V) 3 Vin (Max) (V) 15 Iout (Max) (A) 1 Vout (Min) (V) 0.2 Vout (Max) (V) 13.5 Regulated outputs (#) 1 Topology Buck Dimming method PWM Power factor correction (Min) Features Enable/Shutdown, Integrated Switch, Thermal Shutdown Operating temperature range (C) -40 to 125 Switching frequency (Min) (kHz) 1600 Switching frequency (Max) (kHz) 1600 Iq (Typ) (mA) 1.8 Vref (V) 0.205 open-in-new Find other General lighting LED drivers

Package | Pins | Size

SOT-23-THN (DDC) 6 5 mm² 2.9 x 1.6 open-in-new Find other General lighting LED drivers


  • VIN Operating Range of 3 V to 15 V
  • Drives up to 5 High-Brightness LEDs in Series at 1 A
  • Thin SOT-6 Package
  • 1.6-MHz Switching Frequency
  • EN/DIM Input for Enabling and PWM Dimming of LEDs
  • 300-mΩ NMOS Switch
  • 40-nA Shutdown Current at VIN = 5 V
  • Internally Compensated Current-mode Control
  • Cycle-by-Cycle Current Limit
  • Input Voltage UVLO
  • Overcurrent Protection
  • Thermal Shutdown
open-in-new Find other General lighting LED drivers


The LM3405 is a 1-A constant current buck LED driver designed to provide a simple, high efficiency solution for driving high power LEDs. With a 0.205-V reference voltage feedback control to minimize power dissipation, an external resistor sets the current as required for driving various types of LEDs. Switching frequency is internally set to 1.6 MHz, allowing small surface mount inductors and capacitors to be used. The LM3405 uses current-mode control and internal compensation offering ease of use and predictable, high performance regulation over a wide range of operating conditions. With a maximum input voltage of 15 V, the device can drive up to 3 High-Brightness LEDs in series at 1-A forward current, with the single LED forward voltage of approximately 3.7 V. Additional features include user accessible EN/DIM pin for enabling and PWM dimming of LEDs, thermal shutdown, cycle-by-cycle current limit and overcurrent protection.

open-in-new Find other General lighting LED drivers
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TPS92513 ACTIVE 42-V 1.5-A analog current adjustable buck LED driver This product provides both analog dimming and PWM dimming capabilities and it supports up to 1.5 A output current. Input voltage up to 42 V.

Technical documentation

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Type Title Date
* Datasheet LM3405 1.6-MHz, 1-A Constant Current Buck Regulator For Powering LEDS datasheet (Rev. C) Dec. 23, 2016
White papers Common LED Functions and LED Driver Design Considerations Sep. 21, 2020
Technical articles Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical articles LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
Technical articles Take better selfies with innovative LED flashes Nov. 18, 2014
Technical articles Solving the automotive EMI issues in new cars with all the screens Sep. 10, 2014
Application notes AN-1656 Design Challenges of Switching LED Drivers (Rev. A) May 03, 2013
User guides AN-1590 LM3405 Demo Board (Rev. A) May 01, 2013
User guides AN-1685 LM3405A Demo Board (Rev. B) May 01, 2013
Application notes Powering & Dimming High-Brightness LEDs w/ LM3405 Constant-Current Buck Reg (Rev. A) May 01, 2013
Application notes AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) Apr. 23, 2013

Design & development

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

Hardware development

document-generic User guide

The LM3405 demo board is configured to drive a series string of high power, high brightness LEDs at a forward current of 1A using the LM3405 constant current buck regulator. The board can accept a full input operating range of 3V to 15V. The converter output voltage adjusts as needed to maintain a (...)

  • VIN operating range of 3V to 15V
  • Thin SOT23-6 package
  • 1.6MHz switching frequency
  • 300mΩ NMOS switch
  • 40nA shutdown current at VIN = 5V
  • EN/DIM input for enabling and PWM dimming of LEDs
  • Internally compensated current-mode control
  • Cycle-by-cycle current limit
  • Input voltage UVLO
  • Over-current protection
  • Thermal (...)

Design tools & simulation

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 (...)
  • 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 symbols

Package Pins Download
SOT-23-THIN (DDC) 6 View options

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