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参数资料
| 型号： | LTC3452EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER PHOTO FLASH 20-QFN |
| 标准包装： | 2,500 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 7 |
| 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 ~ 1.1MHz |
| 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： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LTC3452
Synchronous Buck-Boost
MAIN/CAMERA White LED Driver
FEATURES
DESCRIPTIO
■
■
■
■
■
■
■
■
■
■
■
■
High Efficiency: ≥ 85% Over Entire Li-Ion Battery
Range
Wide V IN Range: 2.7V to 5.5V
Independent MAIN/CAMERA Current Control
Up to 425mA Continuous Output Current
Internal Soft-Start
Open/Shorted LED Protection
PWM Brightness Control
LED Current Matching Typically <2.5%
Constant Frequency 1MHz Operation
Low Shutdown Current: 6.5 μ A
Overtemperature Protection
Small Thermally Enhanced 20-Lead
(4mm × 4mm) QFN Package
The LTC ? 3452 is a synchronous buck-boost DC/DC con-
verter optimized for driving two banks of white LEDs from
a single Li-Ion battery input. Five parallel LEDs can be
driven at up to 25mA each in the low power LED bank,
while two LEDs can be driven at up to 150mA each (or a
single LED at 300mA) in the high power LED bank. The
regulator operates in either synchronous buck, synchro-
nous boost or buck-boost mode, depending on input
voltage and LED maximum forward voltage. Optimum
efficiency is achieved by sensing which LED requires the
largest forward voltage drop at its programmed current,
and regulating the common output rail for lowest dropout.
Efficiency of 85% can be achieved over the entire usable
range of a Li-Ion battery (2.7V to 4.2V).
APPLICATIO S
■ Cell Phones
■ Digital Cameras
■ PDAs
■ Portable Devices
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Maximum LED current for each LED display is program-
mable with a single external resistor. Dual enable pins
allow for PWM brightness control in the low power bank
and independent on/off control for the high current bank
(optimal for LED camera flash). In shutdown, the supply
current is only 6.5 μ A.
A high constant operating frequency of 1MHz allows the
use of a small external inductor. The LTC3452 is offered
in a low profile (0.75mm) thermally enhanced 20-lead
(4mm × 4mm) QFN package.
TYPICAL APPLICATIO
5 × 20mA White LED Display + 200mA Camera Light Driver
T A = 25 ° C
EFFICIENCY = Σ
TORCH MODE AT 100mA
V IN
SINGLE
Li-Ion CELL
2.7V TO 4.2V
+
EN H
I SETH
6.19k
2.2 μ F
V IN
L
4.7 μ H
PV IN SW1
SW2
V OUT
D1
CAM
LED H1
LED H2
200mA
D2
4.7 μ F
Torch and Flash Mode Efficiency
95
93 (V OUT – V LEDx ) ? I LEDx
V IN ? I IN
91
89
87
0.1 μ F
V C
1MHz
BUCK/BOOST
LED L1
LED L2
LED L3
0mA TO
20mA
D3
0mA TO
20mA
D4
0mA TO
20mA
D5
0mA TO
D6
85
83
81
79
FLASH MODE AT 200mA
EN L
LTC3452
LED L4
20mA
0mA TO
77
I SETL
LED L5
20mA
75
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
10.2k
GND
GND
PGND
EXPOSED PAD
MAIN DISPLAY LED BACKLIGHT
3452 TA01a
V IN (V)
3452 TA01b
D1: AOT 2015
D2 TO D6: NICHIA NSCW100
L: COILCRAFT DO3314-472
3452f
1
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相关代理商/技术参数 |
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|---|---|
| LTC3453 | 制造商:LINER 制造商全称:Linear Technology 功能描述:700mA Low Noise High Current LED Charge Pump |
| LTC3453EUF | 制造商:Linear Technology 功能描述:LED DRVR 4Segment 3.3V/5V 16-Pin QFN EP |
| LTC3453EUF#PBF | 功能描述:IC LED DRIVER PHOTO FLASH 16-QFN 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 |
| LTC3453EUF#TRPBF | 功能描述:IC LED DRIVER PHOTO FLASH 16-QFN 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 |
| LTC3454 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1A Synchronous Buck-Boost High Current LED Driver |
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