LT3518 Ver la hoja de datos (PDF) - Analog Devices

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LT3518

Full-Featured LED Driver with 2.3A Switch Current

Analog Devices 

LT3518

Full-Featured LED Driver

with 2.3A Switch Current

Features

nn 3000:1 True Color PWM™ Dimming Ratio

nn 2.3A, 45V Internal Switch

nn 100mV High Side Current Sense

nn Open LED Protection

nn Adjustable Frequency: 250kHz to 2.5MHz

nn Wide Input Voltage Range:

nn Operation from 3V to 30V

nn Transient Protection to 40V

nn Operates in Boost, Buck Mode and Buck-Boost Mode

nn Gate Driver for PMOS LED Disconnect

nn Constant-Current and Constant-Voltage Regulation

nn CTRL Pin Provides 10:1 Analog Dimming

nn Low Shutdown Current: <1µA

nn Available in (4mm × 4mm) 16-Lead QFN and 16-Pin

TSSOP Packages

Applications

nn Display Backlighting

nn Automotive and Avionic Lighting

nn Illumination

nn Scanners

Description

The LT®3518 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. Pro-

grammable 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.

L, LT, LTC and LTM are registered trademarks and True Color PWM is a trademark of Analog

Devices Inc. All other trademarks are the property of their respective owners. Protected by U.S.

Patents, including 7199560, 7321203, 7746300. Patent Pending.

Typical Application

1.5A Buck Mode LED Driver

PVIN

24V

VIN

3.3V

2.2µF

VREF

PWM

68mΩ M1

2.2µF

ISP

VIN

SHDN

ISN TG

SW

LT3518

CTRL

FB

PWM

SS

SYNC

RT

TGEN VREF VC GND

0.1µF

1.5A

16.9k

1MHz

10µF

15µH

0.1µF

3518 TA01a

Efficiency

100

CTRL = VREF

90

80

70

60

50

40

0

20

40

60

80 100

PWM DUTY CYCLE (%)

3518 TA01b

For more information www.linear.com/LT3518

3518ff

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