Top

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, 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) 16 32 mm² 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 Switching Frequency
  • Zero Current Shutdown and Thermal Shutdown
  • LED Output Status Flag (LM3423 and LM3423-Q0 Only)
  • Fault Status Flag and Timer(LM3423 and LM3423-Q0 Only)
open-in-new Find other Illumination LED drivers

Description

The LM3421 and LM3423 family of devices are versatile high voltage N-channel MOSFET controllers for LED drivers. They can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75 V, makes the these controllers ideal for illuminating LEDs in a large family of applications.

Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3421 and LM3423 devices use 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 LM3421 and LM3423 devices include a high-voltage start-up 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.

open-in-new Find other Illumination LED drivers
Download
Similar products you might be interested in
open-in-new Compare products
Same functionality with different pin-out to the compared device.
TPS92691 ACTIVE TPS92691 multi-topology LED driver with rail-to-rail current sense amplifier This product is a multi-topology low-side NFET LED controller with rail-to-rail current sense capability.

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 10
Type Title Date
* Data sheet LM342x N -Channel Controllers for Constant-Current LED Drivers datasheet (Rev. G) Jul. 30, 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 LM3421 SEPIC LED Driver Evaluation Board for Automotive Applications (Rev. B) May 03, 2013
User guide AN-1907 LM3423 Buck-Boost Configuration Evaluation Board (Rev. A) May 01, 2013
Application note 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

EVALUATION BOARD Download
document-generic User guide
149
Description

This wide range evaluation board showcases the LM3423 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 700 mA from a DC input voltage of 10 to 70V.

The evaluation board showcases most features of the LM3423 including PWM (...)

EVALUATION BOARD Download
document-generic User guide
149
Description

This evaluation board showcases the LM3423 NFET controller used with a boost current regulator. It is designed to drive 9 to 12 LEDs at a maximum average LED current of 700mA from a DC input voltage of 10 to 26V. The evaluation board showcases most features of the LM3423 including PWM dimming (...)

Features

Contents:

  • LM3423BS2LYEV assembled board
  • AN-2011�LM3423 Boost 2 Layer Evaluation Board Application Note

Design tools & simulation

SIMULATION MODEL Download
SNVMAB4B.ZIP (132 KB) - PSpice Model
SIMULATION MODEL Download
SNVMAR9.TSC (895 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVMAS0.TSC (891 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVMAS1.ZIP (25 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 symbols

Package Pins Download
HTSSOP (PWP) 16 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos