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

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 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 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 × 4mm) and the 16-pin TSSOP package. The LT3518 provides a complete solution for both constant-voltage and constant-current applications.

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 × 4mm) 16-Lead QFN and 16-Pin TSSOP Packages
Typical Application
LT3518 Typical Application
LT3518 Typical Application
Applications
  • Display Backlighting
  • Automotive and Avionic Lighting
  • Illumination
  • Scanners
Packaging
LT3518 Package Drawing
LT3518 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT3518EFE#PBFTSSOP-16E$4.43$3.10
LT3518EFE#TRPBFTSSOP-16E$3.16
LT3518EUF#PBF4x4 QFN-16E$4.21$2.95
LT3518EUF#TRPBF4x4 QFN-16E$3.01
LT3518HFE#PBFTSSOP-16H$5.67$3.97
LT3518HFE#TRPBFTSSOP-16H$4.03
LT3518HUF#PBF4x4 QFN-16H$5.42$3.79
LT3518HUF#TRPBF4x4 QFN-16H$3.85
LT3518IFE#PBFTSSOP-16I$5.31$3.72
LT3518IFE#TRPBFTSSOP-16I$3.78
LT3518IUF#PBF4x4 QFN-16I$5.06$3.54
LT3518IUF#TRPBF4x4 QFN-16I$3.60
Demo Boards
Part NumberDescriptionPrice
DC1160ALT3518EUF Demo Board$100.00
Datasheet
Reliability Data
LT Journal
Press Release
CAD Symbol
LTspice
Related Products
LT3518 - Full-Featured LED Driver with 2.3A Switch Current
LT3517/18 - 45V、1.3A/2.3A LED 驱动器用于升压、降压或降压-升压型大电流 LED 应用
面向升压、降压或降压-升压型大电流 LED 应用的 45V、2.3A LED 驱动器可提供 150°C 最高结温并采用 QFN 封装
R518 - Reliability Data
Oct 2007 -LED Driver Yields 3000:1 True Color PWM Dimming with Any Buck, Boost or Buck-Boost Topology from a Wide 3V–40V Input Range
45V, 1.3A/2.3A LED Drivers for Boost, Buck or Buck-Boost High Current LED Applications
45V, 2.3A LED Driver for Boost, Buck or Buck-Boost High Current LED Applications Offers Maximum Junction Temperature of 150°C & QFN Package
LT3518 Footprints and Symbols
LT3518 Demo Circuit - 45V, 2.3A Full-Featured Boost LED Driver (12V to 10x 3.4V LEDs @ 330mA)
LT3518 Demo Circuit - 45V, 2.3A Full-Featured Buck LED Driver (24V to 3x 3.4V LEDs @ 1.5A)
LT3518 Demo Circuit - 45V, 2.3A Full-Featured Buck-Boost LED Driver (12V to 4x 3.4V LEDs @ 330mA)