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LTC3218

更新时间： 2024-11-13 04:43:39
品牌 Logo 应用领域
凌特 - Linear 泵
页数 文件大小 规格书
12页 186K
描述
400mA Single Wire Camera LED Charge Pump

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中文翻译

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LTC3218 数据手册

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LTC3218  
400mA Single Wire  
Camera LED Charge Pump  
FEATURES  
DESCRIPTION  
The LTC®3218 is a low-noise, high-current charge pump  
DC/DCconvertercapableofdrivinghighcurrentLEDsatup  
to 400mA from a 2.9V to 4.5V input. A low external parts  
count(oneflyingcapacitor,twoprogrammingresistorsand  
■
Low Noise Constant-Frequency Operation  
■
Multi-Mode Operation: 1x or 2x Boost Mode  
■
Automatic Mode Switching  
■
High Output Current: 150mA (Continuous), 400mA  
(Pulsed) From Li-Ion/Polymer Input  
two bypass capacitors at V and CPO) make the LTC3218  
ideally suited for small, battery-powered applications.  
IN  
■
2-Second Flash Current Timeout for LED Protection  
■
Automatic Soft-Start  
Built-in soft-start circuitry prevents excessive inrush cur-  
rentduringstart-up.Highswitchingfrequencyenablesthe  
use of small external capacitors. A built-in 2-second timer  
protects the LED during flash mode.  
■
Output Disconnect  
■
No Inductors  
■
220mΩ Internal High Side Current Sense Resistor  
■
Single Resistor Programming Capability  
■
Output current level is programmed by an external re-  
sistor. LED current is regulated using an internal high  
side 220mΩ sense resistor. Automatic mode switching  
optimizes efficiency by monitoring the voltage across the  
charge pump and switching modes only when dropout  
is detected. The part is available in a low profile 3mm ×  
2mm 10-lead DFN package.  
Tiny Application Circuit (3mm × 2mm DFN Package,  
All Components < 1mm High)  
APPLICATIONS  
■
LED Torch/Flash Supply for DSCs/Cellphones  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners. Protected by U.S. Patents,  
including 6411531.  
TYPICAL APPLICATION  
Efficiency vs V  
IN  
2.2µF  
100  
90  
80  
70  
60  
50  
40  
CP  
CM  
CPO  
V
2.9V TO 4.5V  
IN  
4.7µF  
2.2µF  
LTC3218  
I
LED  
DISABLED  
ENF  
ENT  
ENABLED  
ENABLED  
LED  
AOT2015  
DISABLED  
GND  
50mA  
I
I
SETT  
SETF  
150mA  
300mA  
ENF ENT  
I
LED  
0
0
1
1
0
1
0
1
0 (SHUTDOWN)  
100mA (TORCH)  
290mA  
3.7 3.9  
(V)  
2.9 3.1 3.3 3.5  
4.1 4.3 4.5  
10.2k  
1%  
V
IN  
3218 TA01b  
390mA (FLASH)  
3218 TA01  
3218fa  
1
1234567...12

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