Datasheet > LT3497EDDB

LT3497EDDB

更新时间： 2024-11-04 05:43:31

品牌	Logo	应用领域
Linear Systems		驱动器肖特基二极管
页数	文件大小	规格书
20页	337K
描述
Dual Full Function White LED Driver with Integrated Schottky Diodes

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中文翻译

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LT3497EDDB 数据手册

LT3497

Dual Full Function White

LED Driver with Integrated

Schottky Diodes

FEATURES

DESCRIPTION

The LT^®3497 is a dual full function step-up DC/DC con-

verter speciﬁcally designed to drive up to 12 white LEDs

(6whiteLEDsinseriesperconverter)fromaLi-Ioncell.Se-

riesconnectionoftheLEDsprovidesidenticalLEDcurrents

resulting in uniform brightness and eliminating the need

for ballast resistors and expensive factory calibration.

■

Drives Up to 12 White LEDs (6 in Series per

Converter) from a 3V Supply

■

Two Independent Boost Converters Capable of

Driving Asymmetric LED Strings

■

Independent Dimming and Shutdown Control of the

Two LED Strings

■

High Side Sense Allows “One Wire Current Source”

The two independent converters are capable of driving

asymmetric LED strings. Accurate LED dimming and

shutdown of the two LED strings can also be controlled

independently.TheLT3497featuresauniquehighsideLED

current sense that enables the part to function as a “one

wire current source;” one side of the LED string can be

returned to ground anywhere, allowing a simpler 1-wire

LED connection. Traditional LED drivers use a grounded

resistor to sense LED current, requiring a 2-wire connec-

tion to the LED string.

per Converter

■

Internal Schottky Diodes

■

Open LED Protection (32V)

■

2.3MHz Switching Frequency

■

±±5 ꢀeference Accuracy

■

V ꢀange: 2.±V to 10V

Dual Wide 2±0:1 True Color PWM^TMDimming

ꢀequires Only 1µF Output Capacitor per Converter

Available in a 3mm × 2mm 10-Pin DFN Package

■

The 2.3MHz switching frequency allows the use of tiny

inductors and capacitors. Few external components are

neededforthedualwhiteLEDDriver:open-LEDprotection

and the Schottky diodes are all contained inside the 3mm

× 2mm DFN package. With such a high level of integra-

tion, the LT3497 provides a high efﬁciency dual white LED

driver solution in the smallest of spaces.

APPLICATIONS

■

Cellular Phones

■

PDAs, Handheld Computers

■

Digital Cameras

MP3 Players

■

GPS ꢀeceivers

, 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.

TYPICAL APPLICATION

Li-Ion Power Driver for 4/4 White LEDs

Efﬁciency

3V TO 5V

= 3.6V

4/4LEDs

1µF

15µH

SW1

15µH

SW2

CAP1

CAP2

LT3497

10Ω

1µF

LED1

LED2

CTRL1

CTRL2

GND

3497 TA01a

OFF ON

SHUTDOWN

AND DIMMING

CONTROL 1

SHUTDOWN

AND DIMMING

CONTROL 2

LED CURRENT (mA)

3497 TA01b

3497f

12 3 4 5 6 7...20

中文翻译

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与LT3497EDDB相关器件

型号	品牌	获取价格	描述	数据表
LT3497EDDB#TR	Linear	获取价格	IC LED DISPLAY DRIVER, PDSO10, 3 X 2 MM, PLASTIC, MO-229WECD-1, DFN-10, Display Driver
LT3497EDDB#TRPBF	Linear	获取价格	LT3497 - Dual Full Function White LED Driver with Integrated Schottky Diodes; Package: DFN
LT3497EDDBTRMPBF	Linear	获取价格	暂无描述
LT3498	Linear	获取价格	20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN
LT3498	ADI	获取价格	采用 3mm x 2mm DFN 封装、具集成肖特基二极管的 20mA LED 驱动器和
LT3498EDDB	Linear	获取价格	20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN
LT3498EDDB#TR	Linear	获取价格	IC LED DISPLAY DRIVER, PDSO12, 3 X 2 MM, PLASTIC, DFN-12, Display Driver
LT3498EDDB#TRM	Linear	获取价格	IC LED DISPLAY DRIVER, PDSO12, 3 X 2 MM, PLASTIC, DFN-12, Display Driver
LT3498EDDB#TRMPBF	ADI	获取价格	20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN
LT3500	Linear	获取价格	Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller

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