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参数资料
| 型号： | LTC3454EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER PHOTO FLASH 10-DFN |
| 标准包装： | 2,500 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 900kHz ~ 1.15MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 5.15V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LTC3454
1A Synchronous Buck-Boost
High Current LED Driver
FEATURES
DESCRIPTION
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High Ef?ciency: >90% Typical in Torch Mode,
>80% in Flash Mode
Wide V IN Range: 2.7V to 5.5V
Up to 1A Continuous Output Current
3.5% LED Current Programming Accuracy
Internal Soft-Start
Open/Shorted LED Protection
Constant Frequency 1MHz Operation
Zero Shutdown Current
Overtemperature Protection
Small Thermally Enhanced 10-Lead (3mm × 3mm)
DFN Package
The LTC ? 3454 is a synchronous buck-boost DC/DC
converter optimized for driving a single high power LED
at currents up to 1A from a single cell Li-Ion battery in-
put. The regulator operates in either synchronous buck,
synchronous boost, or buck-boost mode depending on
input voltage and LED forward voltage. P LED /P IN ef?ciency
greater than 90% can be achieved over the entire usable
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 external resistors and dual enable
inputs. In shutdown no supply current is drawn.
Cell Phone Camera Flash
Cell Phone Torch Lighting
Digital Cameras
APPLICATIONS
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A high constant operating frequency of 1MHz allows the
use of small external components. The LTC3454 is offered
in a low pro?le (0.75mm) thermally enhanced 10-lead
(3mm × 3mm) DFN package.
L , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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PDAs
Misc Li-Ion LED Drivers
TYPICAL APPLICATION
High Ef?ciency Torch/Flash LED Driver
L1
LED Power Ef?ciency vs V IN
V IN
5μH
2.7V TO 4.2V
1-CELL Li-Ion
10μF
V IN
SW1
SW2
V OUT
10μF
I LED
100
95
I LED = 150mA
A
D
LED
90
B
C
LED
EN2 EN1 I LED
0 0 0 (SHUTDOWN)
85
I LED = 1A
0 1 150mA
80
EN1 (TORCH)
1 0 850mA
1 1 1A
75
V C
0.1μF
1MHz
BUCK-BOOST
LTC3454
GND (EXPOSED PAD)
LED: LUMILEDS LXL-PWF1
L1: SUMIDA CDRH6D28-5RONC
I SET1
I SET2
EN2 (FLASH)
R ISET2
3.65k
1%
3454 TA01a
R ISET1
20.5k
1%
70
65 T A = 25°C
EFFICIENCY = (V OUT – V LED )I LED /V IN I IN
60
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
V IN (V)
3454 TA01b
3454fa
1
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