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LT4363 - High Voltage Surge Stopper with Current Limit

LT3952 - 60V LED Driver with 4A Switch Current

Features

  • 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

Typical Application

LT3952 Typical Application
LT3952 Typical Application

Description

The LT®3952 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 spreadspectrum 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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LT3952EFE#PBF TSSOP-28 FE E 05-08-1663 (EB) Yes
LT3952EFE#TRPBF TSSOP-28 FE E 05-08-1663 (EB) Yes
LT3952HFE#PBF TSSOP-28 FE H 05-08-1663 (EB) Yes
LT3952HFE#TRPBF TSSOP-28 FE H 05-08-1663 (EB) Yes
LT3952IFE#PBF TSSOP-28 FE I 05-08-1663 (EB) Yes
LT3952IFE#TRPBF TSSOP-28 FE I 05-08-1663 (EB) Yes


LT3952 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LT3952EFE#PBF TSSOP-28 E $5.64 $3.95 Yes
LT3952EFE#TRPBF TSSOP-28 E $4.01 Yes
LT3952HFE#PBF TSSOP-28 H $6.57 $4.60 Yes
LT3952HFE#TRPBF TSSOP-28 H $4.66 Yes
LT3952IFE#PBF TSSOP-28 I $6.22 $4.35 Yes
LT3952IFE#TRPBF TSSOP-28 I $4.41 Yes
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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 Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2013A LT3952EFE Demo Board | CC/CV Boost LED Driver, 5V ≤ VIN ≤ 36V, VLED = VIN up to 50V @ 330mA $150.00
DC2361A LT3952EFE Demo Board | 2MHz LED Driver, 8V ≤ VIN ≤ 28V, IOUT = 330mA at 40V $150.00
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Click here to view our complete list of demo boards

Applications

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

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, 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

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LT3952

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