Overview

Features and Benefits

  • 4000:1 True Color PWM Dimming
  • 4A, 60V Internal DMOS Switch
  • Wide Input Voltage Range: 3V to 42V
  • 0V to 60V Output Current Regulation with Monitor
  • PMOS Switch Driver for PWM and Output Disconnect
  • LED Short-Circuit Protection and SHORTLED Flag
  • Internal Spread Spectrum Frequency Modulation
  • Constant-Current and Constant-Voltage Regulation
  • Input Current Limit and Monitor
  • Adjustable Frequency: 200kHz to 3MHz, Synchronizable to an External Clock
  • 10:1 Analog Dimming
  • Programmable Open-LED Protection with OPENLED Flag
  • Programmable VIN Undervoltage and Overvoltage Lockout
  • Available in a 28-Lead TSSOP Package

Product Details

The LT3952 is a current mode step-up DC/DC converter with an internal, 60V, 80mΩ DMOS power switch. The LT3952 is specifically designed to drive high power LEDs in multiple configurations. It combines input and output current regulation loops with output voltage regulation to operate as a flexible current/voltage source.

Programmable switching frequency with optional spread-spectrum modulation provides EMI reduction, while still allowing optimization of the external components for efficiency or component size. The LED current is programmable with an external sense resistor, and can be adjusted from zero to full scale with a voltage at the CTRL pin. The external PWM input provides LED ON/OFF control and 4000:1 dimming ratio, and an internal PWM generator delivers the efficiency of PWM dimming to standalone or I/O limited applications. The LT3952 is available in the thermally enhanced 28-lead TSSOP package.

Applications

  • Display Backlighting
  • Automotive and Avionic Lighting
  • Accurate Current-Limited Voltage Regulators

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (2)

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

LTspice

Models for the following parts are available in LTspice:

LT3952

Product Recommendations

LT3952 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

Discussions

LT3952 Discussions

Re: driver for led
1 week(s) ago in Voltage References
Re: LT3952 with Floating LED Output
3 week(s) ago in Power By Linear
LT3952 with Floating LED Output
3 week(s) ago in Power By Linear
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.