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L1937(SOT-363) PDF预览

L1937(SOT-363)

更新时间： 2024-09-25 19:04:39
品牌 Logo 应用领域
友顺 - UTC 光电二极管
页数 文件大小 规格书
7页 118K
描述
Display Driver, PDSO6

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中文翻译

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L1937(SOT-363) 技术参数

生命周期：ActiveReach Compliance Code：compliant
风险等级：5.76JESD-30 代码：R-PDSO-G6
端子数量：6最高工作温度：85 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：TSSOP封装等效代码：TSSOP6,.08
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
电源：3 V认证状态：Not Qualified
子类别：Display Drivers标称供电电压：3 V
表面贴装：YES温度等级：INDUSTRIAL
端子形式：GULL WING端子节距：0.635 mm
端子位置：DUALBase Number Matches：1

L1937(SOT-363) 数据手册

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UTC L1937  
LINEAR INTEGRATED CIRCUIT  
WHITE LED STEP-UP  
CONVERTER  
1
2
3
DESCRIPTION  
The UTC L1937 is a step-up DC/DC converter  
5
specifically designed to drive white LEDs with  
constant current. The device can drive two, three or  
four LEDs in series from Li-Ion cell. Series  
a
4
a
SOT-25  
connection of the LEDs provides identical LED  
currents resulting in uniform brightness and  
eliminating the need for ballast resistors. The UTC  
LT1937 switches at 1.2MHz, allowing the use of tiny  
external components. The output capacitor can be as  
small as 0.22 μF, saving space and cost versus  
alternative solutions. A low 95mV feedback voltage  
minimizes power loss in the current setting resistor for  
better efficiency.  
1
SOT-363  
FEATURES  
* 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 0.22μFOutput Capacitor  
APPLICATIONS  
* Marking code: LTCG  
* Cellular Phones  
* PDAs, Handheld Computers  
* Digital Cameras  
* MP3 Players  
* GPS Receivers  
PIN FUNCTION  
PIN NO. PIN NO.  
PIN NAME  
SYMBOL  
FUNCTION  
(SOT-25) (SOT-363).  
Connect inductor/diode here. Minimize trace area at this pin to  
reduce EMI.  
Connect directly to local ground plane.  
Reference voltage is 95mV. Connect cathode of lowest LED and  
resistor here. Calculate resistor value according to the formula:  
RFB = 95mV/ILED  
Connect to 1.5V or higher to enable device;0.4V or less to  
disable device.  
Input Supply Pin. Must be locally bypassed.  
Connect to Pin 2 and to local ground plane  
SW  
1
2
Switch  
GND  
Ground  
FB  
3
4
Feedback  
Shutdown  
SHDN  
VIN  
GND  
5
6
5
Input Supply  
Ground  
UTC UNISONIC TECHNOLOGIES CO., LTD.  
1
QW-R103-021,A  
1234567

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