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LM27952SD PDF预览

LM27952SD

更新时间: 2024-11-12 21:55:39
品牌 Logo 应用领域
美国国家半导体 - NSC 显示驱动器驱动程序和接口开关接口集成电路光电二极管
页数 文件大小 规格书
8页 520K
描述
White LED Adaptive 1.5X/1X Switched Capacitor Current Driver

LM27952SD 技术参数

是否Rohs认证: 不符合生命周期:Transferred
包装说明:4 X 3 MM, 0.80 MM HEIGHT, LLP-14Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.1接口集成电路类型:LED DISPLAY DRIVER
JESD-30 代码:R-PDSO-N14JESD-609代码:e0
长度:4 mm湿度敏感等级:1
复用显示功能:NO功能数量:1
区段数:4端子数量:14
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:HVSON
封装等效代码:SOLCC14,.12,20封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度(摄氏度):260
电源:3.3/5 V认证状态:Not Qualified
座面最大高度:0.8 mm子类别:Display Drivers
最大供电电压:5.5 V最小供电电压:3 V
标称供电电压:3.6 V表面贴装:YES
技术:CMOS温度等级:INDUSTRIAL
端子面层:Tin/Lead (Sn/Pb)端子形式:NO LEAD
端子节距:0.5 mm端子位置:DUAL
处于峰值回流温度下的最长时间:40宽度:3 mm
Base Number Matches:1

LM27952SD 数据手册

 浏览型号LM27952SD的Datasheet PDF文件第2页浏览型号LM27952SD的Datasheet PDF文件第3页浏览型号LM27952SD的Datasheet PDF文件第4页浏览型号LM27952SD的Datasheet PDF文件第5页浏览型号LM27952SD的Datasheet PDF文件第6页浏览型号LM27952SD的Datasheet PDF文件第7页 
May 2005  
LM27952  
White LED Adaptive 1.5X/1X Switched Capacitor Current  
Driver  
General Description  
Features  
n Drives up to 4 LEDs with up to 30mA each  
n Regulated current sources with 0.2%(typ.) matching  
n 3/2x, 1x Gain transition based on LED VF  
n Peak Efficiency Over 85%  
The LM27952 is a switched capacitor white-LED driver ca-  
pable of driving up to 4 LEDs with 30mA through each LED.  
Its 4 tightly regulated current sinks ensure excellent LED  
current and brightness matching. LED drive current is pro-  
grammed by an external sense resistor. The LM27952 oper-  
ates over an input voltage range from 3.0V to 5.5V and  
requires only four low-cost ceramic capacitors.  
n Input Voltage Range: 3.0V to 5.5V  
n PWM Brightness Control  
n Very Small Solution Size - NO INDUCTOR  
n Fixed 750kHz Switching Frequency  
The LM27952 provides excellent efficiency without the use  
of an inductor by operating the charge pump in a gain of 3/2,  
or in a gain of 1. Maximum efficiency is achieved over the  
input voltage range by actively selecting the proper gain  
based on the LED forward voltage requirements.  
<
n
1µA Shutdown Current  
n 14-pin LLP Package: 4.0mm X 3.0mm X 0.8mm  
Applications  
The LM27952 uses constant frequency pre-regulation to  
minimize conducted noise on the input. It has a fixed 750kHz  
switching frequency optimized for portable applications. The  
LM27952 consumes less than 1µA of supply current when  
shut down.  
n White LED Display Backlights  
n White LED Keypad Backlights  
n General Purpose LED Lighting  
The LM27952 is available in a 14-pin No-Pullback Leadless  
Leadframe Package: LLP-14.  
Typical Application Circuit  
20148001  
© 2005 National Semiconductor Corporation  
DS201480  
www.national.com  

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