Datasheet LT3518 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Full-Featured LED Driver with 2.3A Switch Current |
| Pages / Page | 20 / 1 — Features. Description. 3000:1. True Color PWM. Dimming Ratio. 2.3A, 45V … |
| File Format / Size | PDF / 465 Kb |
| Document Language | English |
Features. Description. 3000:1. True Color PWM. Dimming Ratio. 2.3A, 45V Internal Switch. 100mV High Side Current Sense
Model Line for this Datasheet
- LT3518EFE#PBF LT3518EFE#PBF LT3518EFE#TRPBF LT3518EFE#TRPBF LT3518EUF#PBF LT3518EUF#PBF LT3518EUF#TRPBF LT3518EUF#TRPBF LT3518HFE#PBF LT3518HFE#PBF LT3518HFE#TRPBF LT3518HFE#TRPBF LT3518HUF#PBF LT3518HUF#PBF LT3518HUF#TRPBF LT3518HUF#TRPBF LT3518IFE#PBF LT3518IFE#PBF LT3518IFE#TRPBF LT3518IFE#TRPBF LT3518IUF#PBF LT3518IUF#PBF LT3518IUF#TRPBF LT3518IUF#TRPBF
Text Version of Document
LT3518 Full-Featured LED Driver with 2.3A Switch Current
Features Description
n
3000:1 True Color PWM
™
Dimming Ratio
The LT®3518 is a current mode DC/DC converter with an n
2.3A, 45V Internal Switch
internal 2.3A, 45V switch specifically designed to drive n
100mV High Side Current Sense
LEDs. The LT3518 operates as a LED driver in boost, buck n
Open LED Protection
mode and buck-boost mode. It combines a traditional n
Adjustable Frequency: 250kHz to 2.5MHz
voltage loop and a unique current loop to operate as a n
Wide Input Voltage Range:
constant-current source or constant-voltage source. Pro- n
Operation from 3V to 30V
grammable switching frequency al ows optimization of the n
Transient Protection to 40V
external components for efficiency or component size. The n
Operates in Boost, Buck Mode and Buck-Boost Mode
switching frequency of the LT3518 can be synchronized n
Gate Driver for PMOS LED Disconnect
to an external clock signal. The LED current is externally n Constant-Current and Constant-Voltage Regulation programmable with a 100mV sense resistor. The external n CTRL Pin Provides 10:1 Analog Dimming PWM input provides 3000:1 LED dimming. The CTRL pin n Low Shutdown Current: <1µA provides further 10:1 dimming ratio. n Available in (4mm × 4mm) 16-Lead QFN and 16-Pin The LT3518 is available in the tiny footprint 16-lead QFN TSSOP Packages (4mm × 4mm) and the 16-pin TSSOP package. The LT3518 provides a complete solution for both constant-voltage
applications
and constant-current applications. L, LT, LTC and LTM are registered trademarks and True Color PWM is a trademark of Analog n Display Backlighting Devices Inc. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7199560, 7321203, 7746300. Patent Pending. n Automotive and Avionic Lighting n Illumination n Scanners
typical application 1.5A Buck Mode LED Driver Efficiency
100 CTRL = VREF 10µF 68mΩ M1 PVIN 90 24V 2.2µF 1.5A 80 15µH ISP ISN TG VIN 70 VIN SW 3.3V 2.2µF SHDN EFFICIENCY (%) LT3518 60 VREF CTRL FB 50 PWM PWM SS SYNC RT 40 TGEN VREF VC GND 0 20 40 60 80 100 16.9k PWM DUTY CYCLE (%) 0.1µF 0.1µF 1MHz 3518 TA01b 3518 TA01a 3518ff For more information www.linear.com/LT3518 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
Features Description
n
3000:1 True Color PWM
™
Dimming Ratio
The LT®3518 is a current mode DC/DC converter with an n
2.3A, 45V Internal Switch
internal 2.3A, 45V switch specifically designed to drive n
100mV High Side Current Sense
LEDs. The LT3518 operates as a LED driver in boost, buck n
Open LED Protection
mode and buck-boost mode. It combines a traditional n
Adjustable Frequency: 250kHz to 2.5MHz
voltage loop and a unique current loop to operate as a n
Wide Input Voltage Range:
constant-current source or constant-voltage source. Pro- n
Operation from 3V to 30V
grammable switching frequency al ows optimization of the n
Transient Protection to 40V
external components for efficiency or component size. The n
Operates in Boost, Buck Mode and Buck-Boost Mode
switching frequency of the LT3518 can be synchronized n
Gate Driver for PMOS LED Disconnect
to an external clock signal. The LED current is externally n Constant-Current and Constant-Voltage Regulation programmable with a 100mV sense resistor. The external n CTRL Pin Provides 10:1 Analog Dimming PWM input provides 3000:1 LED dimming. The CTRL pin n Low Shutdown Current: <1µA provides further 10:1 dimming ratio. n Available in (4mm × 4mm) 16-Lead QFN and 16-Pin The LT3518 is available in the tiny footprint 16-lead QFN TSSOP Packages (4mm × 4mm) and the 16-pin TSSOP package. The LT3518 provides a complete solution for both constant-voltage
applications
and constant-current applications. L, LT, LTC and LTM are registered trademarks and True Color PWM is a trademark of Analog n Display Backlighting Devices Inc. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7199560, 7321203, 7746300. Patent Pending. n Automotive and Avionic Lighting n Illumination n Scanners
typical application 1.5A Buck Mode LED Driver Efficiency
100 CTRL = VREF 10µF 68mΩ M1 PVIN 90 24V 2.2µF 1.5A 80 15µH ISP ISN TG VIN 70 VIN SW 3.3V 2.2µF SHDN EFFICIENCY (%) LT3518 60 VREF CTRL FB 50 PWM PWM SS SYNC RT 40 TGEN VREF VC GND 0 20 40 60 80 100 16.9k PWM DUTY CYCLE (%) 0.1µF 0.1µF 1MHz 3518 TA01b 3518 TA01a 3518ff For more information www.linear.com/LT3518 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
