LT3599FE 데이터 시트보기 (PDF) - Linear Technology

부품명

상세내역

제조사

LT3599FE

4-String 120mA LED Driver with ±1.5% Current Matching

Linear Technology 

LT3599

4-String 120mA LED Driver

with ±1.5% Current Matching

Features

nn True Color PWMTM Dimming Ratio Up to 3000:1

nn Drives Four Strings of LEDs at Up to 120mA

nn ±1.5% Accurate LED Current Matching

nn Wide Input Voltage Range: 3.1V to 30V

nn Output Voltage Up to 44V

nn Regulates LED Current Even When VIN > VOUT

nn Disconnects LEDs in Shutdown

nn Programmable Maximum VOUT (Regulated)

nn Open/Short LED Protection and Fault Flags

nn Programmable LED Current Derating

nn Adjustable Frequency: 200kHz to 2.1MHz

nn Synchronizable to an External Clock

nn Analog Dimming Up to 20:1

nn Programmable Input UVLO with Hysteresis

nn Thermally Enhanced 32-Pin (5mm × 5mm) QFN and

28-Pin TSSOP Packages

Applications

nn Automotive Navigation TFT LCD Displays

nn Desktop and Notebook TFT LCD Displays

Description

The LT®3599 is a fixed frequency 2A step-up DC/DC

converter designed to drive four strings of 120mA LEDs

up to a 44V output voltage. The switching frequency is

programmable from 200kHz to 2.1MHz through an ex-

ternal resistor.

LED dimming can be achieved with analog dimming on

the CTRL pin, and with pulse width modulation dimming

on the PWM pin. The LT3599 accurately regulates LED

current even when the input voltage is higher than the

LED output voltage.

Additional features include programmable LED current

derating, switching frequency synchronization to an ex-

ternal clock, LED string disable control, OPENLED alert

pin, SHORTLED alert pins and programmable maximum

output voltage when all LED strings are disconnected. The

LT3599 is available in the thermally enhanced 32-pin (5mm

× 5mm) QFN and 28-pin TSSOP packages.

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. Protected by U.S. Patents,

including 7199560.

Typical Application

PVIN

8V TO 24V

200k

3.3µF

VIN

VIN

3.1V TO 5.5V

VIN

1µF

100k

100k

31.6k

PWM

33.2k

53.6k

53.6k

90% Efficient 12W LED Driver

10µH

VIN

SW

SHORTLED

OPENLED

SHDN/UVLO

PWM

SYNC

CTRL

LT3599

RT

VREF

VOUT

VO_SW

FB

1M

31.6k

TSET

80.6k

DISABLE4

ISET SS

LED1

LED2

LED3

LED4

GND VC

80mA PER STRING

16.5k

47nF

100pF

10k

2.2nF

4.7µF

×2

3599 TA01a

For more information www.linear.com/LT3599

LED Current Matching

1.5

ALL FOUR LED STRINGS

1.0

0.5

0

–0.5

–1.0

–1.5

–50 –25

0 25 50 75 100 125 150

TEMPERATURE (°C)

3599 TA01b

3599ff

1

Share Link: