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LT3518 - Full-Featured LED Driver with 2.3A Switch Current

Features

  • 3000:1 True Color PWM™ Dimming Ratio
  • 2.3A, 45V Internal Switch
  • 100mV High Side Current Sense
  • Open LED Protection
  • Adjustable Frequency: 250kHz to 2.5MHz
  • Wide Input Voltage Range:
      Operation from 3V to 30V
      Transient Protection to 40V
  • Operates in Boost, Buck Mode and Buck-Boost Mode
  • Gate Driver for PMOS LED Disconnect*
  • Constant-Current and Constant-Voltage Regulation
  • CTRL Pin Provides 10:1 Analog Dimming
  • Low Shutdown Current: <1µA
  • Available in (4mm x 4mm) 16-Lead QFN and 16-Pin TSSOP Packages

Typical Application

LT3518
LT3518
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Description

The LT3518 is a current mode DC/DC converter with an internal 2.3A, 45V switch specifically designed to drive LEDs. The LT3518 operates as a LED driver in boost,buck and buck-boost modes. It combines a traditional voltage loop and a unique current loop to operate as a constant-current source or constant-voltage source. Programmable switching frequency allows optimization of the external components for efficiency or component size. The switching frequency of the LT3518 can be synchronized to an external clock signal. The LED current is externally programmable with a 100mV sense resistor. The external PWM input provides 3000:1 LED dimming. The CTRL pin provides further 10:1 dimming ratio.

The LT3518 is available in the tiny footprint 16-Lead QFN (4mm x 4mm) and the 16-Pin TSSOP package. The LT3518 provides a complete solution for both constant-voltage and constant-current applications.

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Packaging

QFN-16

LT3518
LT3518
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Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3518EFE TSSOP 16 E $4.43 $3.10 View
LT3518EFE#PBF TSSOP 16 E $4.43 $3.10 View
LT3518EFE#TRPBF TSSOP 16 E   $3.16 View
LT3518EUF#PBF QFN 16 E $4.21 $2.95 View
LT3518EUF#TRPBF QFN 16 E   $3.01 View
LT3518HFE TSSOP 16 H $5.67 $3.97 View
LT3518HFE#PBF TSSOP 16 H $5.67 $3.97 View
LT3518HFE#TRPBF TSSOP 16 H   $4.03 View
LT3518IFE TSSOP 16 I $5.31 $3.72 View
LT3518IFE#PBF TSSOP 16 I $5.31 $3.72 View
LT3518IFE#TRPBF TSSOP 16 I   $3.78 View
LT3518IUF#PBF QFN 16 I $5.06 $3.54 View
LT3518IUF#TRPBF QFN 16 I   $3.60 View
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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.

Evaluation Kits

Part Number Description Price
DC1160A LT3518EUF Demo Board $100.00
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Applications

  • Display Backlighting
  • Automotive and Avionic Lighting
  • Illumination
  • Scanners
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Simulate

LTSpice IV is a powerful FREE circuit simulator and schematic capture program, providing macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

  • Step 1. If you do not already have a copy of LTSpice IV, click here to download and install LTSpice / SwitcherCAD III

  • Step 2. Once LTSpice is installed, click here for a ready to run demonstration circuit of the LT3518 in Boost Mode ,
     
  • Step 3. If LTspice IV does not automatically open after clicking the above link, 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 demonstartion circuit by selecting "Open" from the "File" menu.
For our complete list of hundreds of ready to run demo circuits, visit our LTspice IV Demo Circuits Collection
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