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LT1937ES5

更新时间： 2024-11-29 22:22:43
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
12页 361K
描述
White LED Step-Up Converter in SC70 and ThinSOT

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中文翻译

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LT1937ES5 数据手册

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LT1937  
White LED  
Step-Up Converter in  
SC70 and ThinSOT  
U
FEATURES  
DESCRIPTIO  
The LT®1937 is a step-up DC/DC converter specifically  
designed to drive white LEDs with a constant current. The  
device can drive two, three or four LEDs in series from a  
Li-Ion cell. Series connection of the LEDs provides iden-  
tical LED currents resulting in uniform brightness and  
eliminating the need for ballast resistors. The LT1937  
switches at 1.2MHz, allowing the use of tiny external  
components. The output capacitor can be as small as  
0.22µF, saving space and cost versus alternative solu-  
tions. A low 95mV feedback voltage minimizes power loss  
in the current setting resistor for better efficiency.  
■
Inherently Matched LED Current  
■
High Efficiency: 84% Typical  
■
Drives Up to Four LEDs from a 3.2V Supply  
■
Drives Up to Six LEDs from a 5V Supply  
■
36V Rugged Bipolar Switch  
■
Fast 1.2MHz Switching Frequency  
■
Uses Tiny 1mm Tall Inductors  
■
Requires Only 0.22µF Output Capacitor  
Low Profile SC70 and ThinSOTTM Packaging  
■
U
APPLICATIO S  
The LT1937 is available in low profile SC70 and ThinSOT  
packages.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
ThinSOT is a trademark of Linear Technology Corporation.  
■
Cellular Phones  
■
PDAs, Handheld Computers  
■
Digital Cameras  
■
MP3 Players  
■
GPS Receivers  
U
TYPICAL APPLICATIO  
Conversion Efficiency  
L1  
22µH  
90  
D1  
V
IN  
3V TO 5V  
85  
80  
C1  
C2  
LED 1  
LED 2  
LED 3  
1µF  
0.22µF  
V
SW  
FB  
IN  
15mA  
V
IN  
= 3V  
V
IN  
= 3.6V  
LT1937  
75  
70  
65  
60  
OFF ON  
SHDN  
GND  
R1  
6.34Ω  
1937 F01a  
C1, C2: X5R OR X7R DIELECTRIC  
D1: CENTRAL SEMICONDUCTOR CMDSH-3  
L1: MURATA LQH3C-220 OR EQUIVALENT  
0
5
10  
LED CURRENT (mA)  
15  
20  
Figure 1. Li-Ion Powered Driver for Three White LEDs  
1937 TA01b  
1937f  
1
1234567...12

中文翻译

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LT1937ES5 替代型号

型号 品牌 替代类型 描述 数据表
LT1937ES5#PBF Linear

功能相似

 LT1937 - White LED Step-Up Converter in SC70 and ThinSOT; Package: SOT; Pins: 5; Temperatu
LT1937ES5#TR Linear

功能相似

 LT1937 - White LED Step-Up Converter in SC70 and ThinSOT; Package: SOT; Pins: 5; Temperatu

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LT1937ES5#TR Linear

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 		LT1937 - White LED Step-Up Converter in SC70 and ThinSOT; Package: SOT; Pins: 5; Temperatu
LT1937ES5#TRM Linear

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 		LT1937 - White LED Step-Up Converter in SC70 and ThinSOT; Package: SOT; Pins: 5; Temperatu
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 		25V、2.2A、2.8MHz 降压型开关稳压器
LT1938IDD#TRPBF Linear

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 		LT1938 - 25V, 2.2A, 2.8MHz Step-Down Switching Regulator; Package: DFN; Pins: 10; Temperat
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LT1939 ADI

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