LT3519 datasheet(1/16 Pages) LINER

Part #	LT3519

Description	LED Driver with Integrated Schottky Diode

PDF	16 Pages

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT3519

1

3519f

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

LED Driver with Integrated

Schottky Diode

The LT

®3519 are ﬁxed frequency step-up DC/DC convert-

ers designed to drive LEDs. They feature an internal 45V,

750mA low side switch and Schottky diode. Combining a

traditional voltage feedback and a unique ﬂoating current

sense feedback allows these converters to operate as a

constant-voltage source or constant-current source. Inter-

nal compensation simpliﬁes applications. These devices

feature ﬂoating LED current sense pins that provide the

most ﬂexibility in choosing a converter conﬁguration to

drive the LEDs. The LED current is externally program-

mable with a 250mV sense resistor. The external PWM

provides up to 3000:1 PWM dimming and the CTRL input

provides analog dimming.

4W Boost Automotive LED Driver

n Up to 3000:1 True Color PWM™ Dimming

n Wide Input Voltage Range

Operation from 3V to 30V

Transient Protection to 40V

n Floating LED Current Sense from 0V to 45V

n 45V, 750mA Internal Switch

n Internal Schottky Diode

n Constant-Current and Constant-Voltage Regulation

n Boost, SEPIC, Buck-Boost Mode or Buck Mode

Topology

n Open LED Protection and Open LED Status Pin

n Programmable Undervoltage Lockout with Hysteresis

n Fixed Frequency: 400kHz (LT3519)

n Internal Compensation

n CTRL Pin Provides Analog Dimming

n Low Shutdown Current: <1μA

n 16-Lead MSOP Package

n Automotive

n Industrial

n Constant Current Source

n Current Limited Constant Voltage Source

VIN (V)

0

20

40

60

80

100

120

10

20

30

3519 TA01b

VIN = 6V AND ABOVE

LED Current vs VIN

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. True Color PWM is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

SW

VIN

VREF

CTRL

SHDN/UVLO

ISP

ISN

FB

OPENLED

ANODE

LT3519

GND

68μH

1M

VIN

6V TO 30V

243k

137k

100k

1M

29.4k

M1

2.5Ω

4.7μF

1μF

38V LED

100mA

CATHODE

PWM

3519 TA01a

VOUT

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