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
  • AEC-Q100 Qualified for Automotive Applications

Product Details

The LT3952A is a current mode step-up DC/DC converter with an internal, 60V, 80mΩ DMOS power switch. The LT3952A 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 LT3952A 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 Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

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.

LTspice

Models for the following parts are available in LTspice:

LT3952
LT3952A

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.

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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.


Price Table Help

 
Evaluation Boards Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.