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LT1937ESC6 PDF预览

LT1937ESC6

更新时间: 2024-11-29 22:51:47
品牌 Logo 应用领域
凌特 - Linear 转换器稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
12页 361K
描述
White LED Step-Up Converter in SC70 and ThinSOT

LT1937ESC6 技术参数

是否Rohs认证:不符合生命周期:Transferred
零件包装代码:SC-70包装说明:SOP, TSSOP6,.08
针数:6Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.18Is Samacsys:N
模拟集成电路 - 其他类型:SWITCHING REGULATOR控制模式:CURRENT-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:10 V
最小输入电压:2.5 V标称输入电压:3 V
JESD-30 代码:R-PDSO-G6JESD-609代码:e0
湿度敏感等级:1功能数量:1
端子数量:6最高工作温度:70 °C
最低工作温度:最大输出电流:0.32 A
封装主体材料:PLASTIC/EPOXY封装代码:SOP
封装等效代码:TSSOP6,.08封装形状:RECTANGULAR
封装形式:SMALL OUTLINE峰值回流温度(摄氏度):235
认证状态:Not Qualified子类别:Switching Regulator or Controllers
表面贴装:YES切换器配置:BOOST
最大切换频率:1600 kHz技术:BIPOLAR
温度等级:COMMERCIAL端子面层:Tin/Lead (Sn/Pb)
端子形式:GULL WING端子节距:0.635 mm
端子位置:DUAL处于峰值回流温度下的最长时间:20
Base Number Matches:1

LT1937ESC6 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

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