Datasheet > LT3598_1

LT3598_1

更新时间： 2022-12-28 23:31:38

品牌	Logo	应用领域
凌特 - Linear		驱动器
页数	文件大小	规格书
24页	396K
描述
6-String 30mA LED Driver with 1.5% Current Matching

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LT3598_1 数据手册

LT3598

6-String 30mA LED Driver

with 1.5% Current Matching

FEATURES

DESCRIPTION

TheLT^®3598isaﬁxedfrequencystep-upDC/DCconverter

designed to drive up to six strings of LEDs at an output

voltage up to 44V. LED dimming can be achieved with

analog dimming on the CTRL pin, and with pulse width

modulation dimming on the PWM pin. The LT3598

accurately regulates LED current even when the input

voltageishigherthantheLEDoutputvoltage.Theswitching

frequency is programmable from 200kHz to 2.5MHz

through an external resistor.

True Color PWM™ Dimming Delivers Up to 3000:1

Dimming Ratio

Drives Six Strings of LEDs at Up to 30mA

1.5% Accurate LED Current Matching

Wide Input Voltage Range: 3.2V to 30V

Output Voltage Up to 44V

Regulates Current Even When V > V

OUT

Disconnects LEDs in Shutdown

Programmable Open LED Protection (Regulated)

OPENLED Alert Pin

Additional features include programmable overvoltage

protection, switching frequency synchronization to an

external clock, LED current derating based on junction

temperature and/or LED temperature, LED string disable

control, OPENLED alert pin and output voltage limiting

when all LED strings are disconnected. The LT3598 is

available in a thermally enhanced 24-lead (4mm × 4mm)

QFN and 24-lead TSSOP packages.

Programmable LED Current Derating

Adjustable Frequency: 200kHz to 2.5MHz

Synchronizable to an External Clock

Parallel Channels for Higher Current per LED String

Thermally Enhanced 4mm × 4mm QFN and 24-Lead

TSSOP Packages

APPLICATIONS

LT, LTC and LTM 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. Protected by U.S. Patents, including 7199560, 7321203.

Notebook Computer Display

Medium Size Displays

Automotive LCD Display

TYPICAL APPLICATION

LED Current Matching

90% Efﬁcient LED Driver for 60 White LEDs

10μH

8V TO 40V

1.5

ALL SIX LED STRINGS

2.2μF

4.7μF

1.0

OUT

O_SW

1.00M

30.9k

0.5

100k

2.2μF

OPENLED

SHDN

PWM

SHDN

PWM

SYNC

–0.5

–1.0

–1.5

LT3598

SYNC

51.1k

REF

10k

–50 –25

75 100 125

LED1

LED2

LED3

LED4

LED5

LED6

CTRL

TEMPERATURE (°C)

3598 TA01b

20mA

100k

GND

SET SET

60.4k

10nF

2.61k

15nF

47pF

14.7k

100k

3598 TA01a

3598fa

12 3 4 5 6 7...24

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