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LT3479

更新时间： 2024-11-08 22:46:55
品牌 Logo 应用领域
凌特 - Linear 驱动器
页数 文件大小 规格书
12页 124K
描述
Single Cell 350mA LED Driver

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中文翻译

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LT3479 数据手册

 浏览型号LT3479的Datasheet PDF文件第2页浏览型号LT3479的Datasheet PDF文件第3页浏览型号LT3479的Datasheet PDF文件第4页浏览型号LT3479的Datasheet PDF文件第5页浏览型号LT3479的Datasheet PDF文件第6页浏览型号LT3479的Datasheet PDF文件第7页 
LTC3490  
Single Cell 350mA  
LED Driver  
U
FEATURES  
DESCRIPTIO  
The LTC®3490 provides a constant current drive for 1W  
LED applications. It is a high efficiency boost converter  
that operates from 1 or 2 NiMH or alkaline cells and  
generates 350mA of constant current with up to 4V of  
compliance. It contains a 100mΩ NFET switch and a  
130mΩ PFET synchronous rectifier. The fixed switching  
frequency is internally set to 1.3MHz.  
■
350mA Constant Current Output  
■
2.8V to 4V Output Compliance  
■
1- or 2-Cell NiMH or Alkaline Input  
■
Synchronous Rectification: Up to 90% Efficiency  
■
Fixed Frequency Operation: 1.3MHz  
■
Low Quiescient Current: <1mA  
■
Very Low Shutdown Current: <50µA  
■
Open LED Output Limited to 4.7V  
TheLTC3490limitstheoutputvoltageto4.7Viftheoutput  
load is disconnected. It also features an analog dimming  
capability that reduces the drive current proportional to  
the CTRL/SHDN pin voltage. A low-battery logic output  
signals when the battery has dropped below 1V/cell. An  
undervoltage lockout circuit shuts down the LTC3490  
when the battery voltage drops below 0.85V/cell. The  
feedbackloopisinternallycompensatedtominimizecom-  
ponent count.  
■
VIN Range: 1V to 3.2V  
Dimming Control  
■
■
Undervoltage Lockout to Protect Batteries  
■
Low Profile (0.75mm) 3mm × 3mm Thermally  
Enhanced 8-Lead DD and S8 Packages  
U
APPLICATIO S  
■
Portable Lighting  
Rechargeable Flashlights  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
U
TYPICAL APPLICATIO  
Efficiency vs VIN at VLED = 3.5V  
Single Cell Minimum Component LED Driver  
100  
3.3µH  
I
= 350mA  
OUT  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
V
SW  
IN  
CAP  
ON/OFF  
LTC3490  
1 NiMH OR  
ALKALINE  
CELL  
350mA  
+
4.7µF  
HIGH  
CURRENT  
LED  
CTRL/SHDN LED  
CELLS LOBAT  
1M  
GND  
3490 TA01  
1
1.5  
2
2.5  
3
V
(V)  
IN  
3490 TA02  
3490f  
1
1234567...12

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