View videos featuring this product

LT3517 - Full-Featured LED Driver with 1.5A Switch Current

Features

  • Click Here For LT3517 Evaluation Kit
  • 5000:1 True Color PWM™ Dimming Ratio
  • 1.5A, 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 × 4mm) 16-Lead QFN and 16-Pin TSSOP Packages

Typical Application

LT3517
LT3517
Back to Top

Description

The LT3517 is a current mode DC/DC converter with an internal 1.5A, 45V switch specifically designed to drive LEDs. The LT3517 operates as a LED driver in boost, buck mode and buck-boost mode. 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 LT3517 can be synchronized to an external clock signal. The LED current is externally programmable with a 100mV sense resistor. The external PWM input provides up to 5000:1 LED dimming. The CTRL pin provides further 10:1 dimming ratio.

The LT3517 is available in the tiny footprint 16-lead QFN (4mm × 4mm) and the 16-pin TSSOP packages. The LT3517 provides a complete solution for both constant-voltage and constant-current applications.

Back to Top

Packaging

QFN-16, TSSOP-16

LT3517
LT3517
Back to Top

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3517EFE TSSOP 16 E $4.07 $2.85 View
LT3517EFE#PBF TSSOP 16 E $4.07 $2.85 View
LT3517EFE#TRPBF TSSOP 16 E   $2.91 View
LT3517EUF#PBF QFN 16 E $3.86 $2.70 View
LT3517EUF#TRPBF QFN 16 E   $2.76 View
LT3517HFE TSSOP 16 H $5.24 $3.67 View
LT3517HFE#PBF TSSOP 16 H $5.24 $3.67 View
LT3517HFE#TRPBF TSSOP 16 H   $3.73 View
LT3517HUF#PBF QFN 16 H $4.99 $3.49 View
LT3517HUF#TRPBF QFN 16 H   $3.55 View
LT3517IFE TSSOP 16 I $4.89 $3.42 View
LT3517IFE#PBF TSSOP 16 I $4.89 $3.42 View
LT3517IFE#TRPBF TSSOP 16 I   $3.48 View
LT3517IUF#PBF QFN 16 I $4.63 $3.24 View
LT3517IUF#TRPBF QFN 16 I   $3.30 View
Buy Now
Request Samples
* 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
DC1279A LT3517EUF | 2.3A/1.3A, 45V, 2.5MHz Full Featured LED Driver w/ True Color PWM Dimming $100.00
Buy Now


Back to Top

Applications

  • Display Backlighting
  • Automotive and Avionic Lighting
  • Illumination
  • Scanners
Back to Top

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 LT3517.

  • 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
Back to Top
EL7801 LM2700 MP1517