收藏本站
LT3497
Dual Full Function White
LED Driver with Integrated
Schottky Diodes
FEATURES
DESCRIPTION
■
■
■
■
■
■
■
■
■
■
■
■
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”
per Converter
Internal Schottky Diodes
Open LED Protection (32V)
2.3MHz Switching Frequency
±5% Reference Accuracy
V IN Range: 2.5V to 10V
Dual Wide 250:1 True Color PWM TM Dimming
Requires Only 1μF Output Capacitor per Converter
Available in a 3mm × 2mm 10-Pin DFN Package
The LT ? 3497 is a dual full function step-up DC/DC con-
verter speci?cally designed to drive up to 12 white LEDs
(6 white LEDs in series per converter) from a Li-Ion cell. Se-
ries connection of the LEDs provides identical LED currents
resulting in uniform brightness and eliminating the need
for ballast resistors and expensive factory calibration.
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. The LT3497 features a unique high side LED
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.
APPLICATIONS
The 2.3MHz switching frequency allows the use of tiny
■
■
■
■
■
Cellular Phones
PDAs, Handheld Computers
Digital Cameras
MP3 Players
GPS Receivers
inductors and capacitors. Few external components are
needed for the dual white LED Driver: open-LED protection
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 ef?ciency dual white LED
driver solution in the smallest of spaces.
, 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
Ef?ciency
V IN
3V TO 5V
80
V IN = 3.6V
4/4LEDs
75
1 μ F
15 μ H
15 μ H
70
SW1
CAP1
V IN
SW2
CAP2
65
1 μ F
10 ?
LT3497
10 ?
1 μ F
60
LED1 LED2
CTRL1 GND CTRL2
55
OFF ON
SHUTDOWN
AND DIMMING
OFF ON
SHUTDOWN
AND DIMMING
3497 TA01a
50
0
5
10 15
LED CURRENT (mA)
20
3497 TA01b
CONTROL 1
CONTROL 2
3497f
1
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
LT3498EDDB#TRPBF IC LED DRVR WT/OLED BCKLGT 12DFN
LT3517HUF#PBF IC LED DRIVER AUTOMOTIVE 16-QFN
LT3519EMS-2#PBF IC LED DRVR HP CONST CURR 16MSOP
LT3590ESC8#TRMPBF IC LED DRVR WHITE BCKLGT SC-70-8
LT3591EDDB#TRMPBF IC LED DRIVER WHITE BCKLGT 8-DFN
LT3593ES6#TRMPBF IC LED DRIVR WHITE BCKLGT TSOT-6
LT3595AEUHH#TRPBF IC LED DRIVR WHITE BCKLGT 56-QFN
LT3595EUHH#TRPBF IC LED DRIVR WHITE BCKLGT 56-QFN
相关代理商/技术参数
LT3497EDDB#TRPBF 功能描述:IC LED DRIVR WHITE BCKLGT 10-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND
LT3498 制造商:LINER 制造商全称:Linear Technology 功能描述:20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN
LT3498EDDB 制造商:LINER 制造商全称:Linear Technology 功能描述:20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN
LT3498EDDB#TRMPBF 功能描述:IC LED DRVR WT/OLED BCKLGT 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND
LT3498EDDB#TRPBF 功能描述:IC LED DRVR WT/OLED BCKLGT 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND
LT34-SC 制造商:THOMAS & BETTS 功能描述:
LT3500 制造商:World Products 功能描述:
LT3500EDD#PBF 功能描述:IC REG DL BUCK/LINEAR 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:*