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LTC3214 PDF预览

LTC3214

更新时间： 2024-09-25 04:19:31
品牌 Logo 应用领域
凌特 - Linear 泵
页数 文件大小 规格书
12页 180K
描述
500mA Camera LED Charge Pump

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中文翻译

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LTC3214 数据手册

 浏览型号LTC3214的Datasheet PDF文件第2页浏览型号LTC3214的Datasheet PDF文件第3页浏览型号LTC3214的Datasheet PDF文件第4页浏览型号LTC3214的Datasheet PDF文件第5页浏览型号LTC3214的Datasheet PDF文件第6页浏览型号LTC3214的Datasheet PDF文件第7页 
LTC3214  
500mA Camera  
LED Charge Pump  
U
FEATURES  
DESCRIPTIO  
The LTC®3214 is a low noise, high current charge pump  
DC/DC converter capable of driving high current LEDs at  
up to 500mA from a 2.9V to 4.5V input. Low external  
parts count (two flying capacitors, one programming  
resistorandtwobypasscapacitorsatVIN andCPO)make  
the LTC3214 ideally suited for small, battery-powered  
applications.  
■
Low Noise Constant Frequency Operation*  
■
High Efficiency: Up to 94%  
■
Multi-Mode Operation: 1x, 1.5x or 2x Boost Modes  
Automatic Mode Switching  
High Output Current: Up to 500mA  
Tiny Application Circuit (3mm × 3mm DFN Package,  
All Components <1mm High)  
Automatic Soft-Start  
Output Disconnect  
Open, Shorted LED Protection  
No Inductors  
■
■
■
■
Built-in soft-start circuitry prevents excessive inrush cur-  
rentduringstart-up.Highswitchingfrequencyenablesthe  
use of small external capacitors.  
■
■
■
■
■
Output current level is programmed by an external resis-  
tor. LED current is regulated using an internal 110mΩ  
sense resistor. Automatic mode switching optimizes effi-  
ciency 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 x 3mm 10-lead DFN  
package.  
Internal 110mΩ LED Current Sense Resistor  
3mm × 3mm 10-Lead DFN Package  
U
APPLICATIO S  
■
LED Torch/Camera Light Supply for Cell Phones,  
PDAs and Digital Cameras  
, 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.  
■
General Lighting and/or Flash/Strobe Applications  
U
TYPICAL APPLICATIO  
Efficiency vs V  
IN  
C1  
C2  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
2.2µF  
2.2µF  
100mA  
200mA  
300mA  
+
–
+
–
C1  
V
C1 C2  
C2  
2.9V TO 4.5V  
C
CPO  
IN  
50mA  
LED  
C
CPO  
4.7µF  
IN  
2.2µF  
LTC3214  
I
I
LED  
LED  
UP TO 500mA  
DISABLE ENABLE  
EN  
0.11Ω  
I
SET  
LED = AOT2015  
= 2.9V TYP AT 100mA  
V
F
R
SET  
2.9  
3.7  
4.1 4.3  
3.1 3.3 3.5  
3.9  
4.5  
3214 TA01a  
V
(V)  
IN  
LED: AOT2015  
3214 TA01b  
3214fa  
1
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中文翻译

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