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参数资料
型号： LTC3453EUF#TRPBF
厂商： Linear Technology
文件页数： 1/12页
文件大小： 0K
描述： IC LED DRIVER PHOTO FLASH 16-QFN
标准包装： 2,500
拓扑： PWM，降压（降压），升压（升压）
输出数： 4
内部驱动器： 是
类型 - 主要： 闪灯/白光
类型 - 次要： 白色 LED
频率： 900kHz ~ 1.1MHz
电源电压： 2.7 V ~ 5.5 V
输出电压： 4.5V
安装类型： 表面贴装
封装/外壳： 16-WQFN 裸露焊盘
供应商设备封装： 16-QFN（4x4）
包装： 带卷 (TR)
工作温度： -40°C ~ 85°C
LTC3453
Synchronous Buck-Boost
High Power White LED Driver
FEATURES
DESCRIPTIO
■
■
■
■
■
■
■
■
■
■
High Efficiency: 90% Typical Over Entire
Li-Ion Battery Range
Wide V IN Range: 2.7V to 5.5V
Up to 500mA Continuous Output Current
Internal Soft-Start
Open/Shorted LED Protection
LED Current Matching Typically <2%
Constant Frequency 1MHz Operation
Low Shutdown Current: 6 μ A
Overtemperature Protection
Small Thermally Enhanced 16-Lead (4mm x 4mm)
The LTC ? 3453 is a synchronous buck-boost DC/DC con-
verter optimized for driving up to 4 white LEDs at a
combined current of up to 500mA from a single Li-Ion
battery input. The regulator operates in either synchro-
nous buck, synchronous boost, or buck-boost mode,
depending on input voltage and LED maximum forward
voltage. Optimum efficiency is achieved using a propri-
etary architecture that determines which LED requires the
largest forward voltage drop at its programmed current,
and regulates the common output rail for lowest dropout.
Efficiency of 90% can be achieved over the entire usable
QFN Package
APPLICATIO S
■ Cell Phones
range of a Li-Ion battery (2.7V to 4.2V).
LED current is programmable to one of four levels (includ-
ing shutdown) with dual current setting resistors and dual
enable pins. In shutdown, the supply current is only 6 μ A.
■
■
■
Digital Cameras
PDAs
Portable Devices
A high constant operating frequency of 1MHz allows the
use of a small external inductor. The LTC3453 is offered
in a low profile (0.75mm) thermally enhanced 16-lead
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
High Efficiency Torch/Flash LED Driver
L1
4.7 μ H
(4mm x 4mm) QFN package.
Torch Mode Efficiency vs V IN
V IN
1-CELL
Li-Ion
2.2 μ F
V IN
PV IN
SW1
SW2
V OUT
150mA/500mA
4.7 μ F
100
180
2.7V to 4.2V
LED1
LED2
D1
90
80
70
EFFICIENCY
160
140
120
0.1 μ F
EN1 (TORCH)
EN2 (FLASH)
V C
EN1
EN2
I SET1
1MHz
BUCK-BOOST
LED3
LED4
D1: LUMILEDS LXCL-PWF1
L1: VISHAY DALE IDCS-2512
60
50
I LED = 150mA
T A = 25 ° C
2.7 3.1 3.5
3.9
4.3
I IN
4.7
5.1
5.5
100
80
PGND
8.25k
1%
3.48k
1%
I SET2
GND
GND
LTC3453
3453 TA01a
EN1
0
1
0
EN2
0
0
1
I LED
0 (SHUTDOWN)
150mA
350mA
V IN (V)
3453 TA01b
1
1
500mA
3453fa
1
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相关代理商/技术参数
参数描述
LTC3454 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Synchronous Buck-Boost High Current LED Driver
LTC3454EDD 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Synchronous Buck-Boost High Current LED Driver
LTC3454EDD#PBF 功能描述:IC LED DRIVER PHOTO FLASH 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
LTC3454EDD#TRPBF 功能描述:IC LED DRIVER PHOTO FLASH 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
LTC3454EDDPBF 制造商:Linear Technology 功能描述:LED Driver 1A Buck-Boost 3.3/5V DFN10EP
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