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LT3465

更新时间： 2024-11-25 22:46:55
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
12页 375K
描述
1.2MHz/2.4MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT

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中文翻译

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LT3465 数据手册

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LT3465/LT3465A  
1.2MHz/2.4MHz White LED  
Step-Up Converters with  
Built-In Schottky in ThinSOT  
U
DESCRIPTIO  
FEATURES  
The LT®3465/LT3465A are step-up DC/DC converters  
designedtodriveuptosixLEDsinseriesfromaLi-Ioncell.  
Series connection of the LEDs provides identical LED  
currents and eliminates the need for ballast resistors.  
These devices integrate the Schottky diode required exter-  
nally on competing devices. Additional features include  
output voltage limiting when LEDs are disconnected, one-  
pin shutdown and dimming control. The LT3465 has  
internal soft-start.  
■
Inherently Matched LED Current  
■
Drives Up to Six LEDs from a 3.6V Supply  
■
No External Schottky Diode Required  
1.2MHz Switching Frequency (LT3465)  
■
■
2.4MHz Switching Frequency Above AM Broadcast  
Band (LT3465A)  
■
Automatic Soft-Start (LT3465)  
■
Open LED Protection  
■
High Efficiency: 81% (LT3465) 79% (LT3465A)  
Typical  
The LT3465 switches at 1.2MHz, allowing the use of tiny  
external components. The faster LT3465A switches at  
2.4MHz. Constantfrequencyswitchingresultsinlowinput  
noise and a small output capacitor. Just 0.22µF is required  
for 3-, 4- or 5-LED applications.  
■
Requires Only 0.22µF Output Capacitor  
■
Low Profile (1mm) SOT-23 Packaging  
U
APPLICATIO S  
■
Cellular Phones  
The LT3465 and LT3465A are available in low profile  
(1mm) 6-lead SOT-23 (ThinSOTTM) packages.  
■
PDAs, Handheld Computers  
■
Digital Cameras  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
ThinSOT is a trademark of Linear Technology Corporation.  
■
MP3 Players  
■
GPS Receivers  
U
TYPICAL APPLICATIO  
Conversion Efficiency  
L1  
82  
22µH  
V
= 3.6V  
IN  
80  
78  
76  
74  
72  
70  
68  
66  
64  
62  
60  
4 LEDs  
3V TO 5V  
SW  
V
OUT  
V
IN  
C1  
1µF  
C2  
0.22µF  
LT3465/  
LT3465A  
CTRL  
GND  
SHUTDOWN  
AND DIMMING  
CONTROL  
FB  
10Ω  
3465A F01a  
C1, C2: X5R OR X7R DIELECTRIC  
L1: MURATA LQH32CN220  
LT3465  
LT3465A  
10  
0
5
15  
20  
Figure 1. Li-Ion Powered Driver for Four White LEDs  
LED CURRENT (mA)  
3465A F01b  
3465af  
1
1234567...12

中文翻译

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