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LM2794TL PDF预览

LM2794TL

更新时间: 2024-11-12 22:25:27
品牌 Logo 应用领域
美国国家半导体 - NSC 开关
页数 文件大小 规格书
16页 484K
描述
Current Regulated Switched Capacitor LED Supply with Analog and PWM Brightness Control

LM2794TL 技术参数

是否Rohs认证: 不符合生命周期:Transferred
包装说明:CSP-14Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.2模拟集成电路 - 其他类型:SWITCHED CAPACITOR REGULATOR
最大输入电压:5.5 V最小输入电压:2.7 V
标称输入电压:3.6 VJESD-30 代码:R-PBGA-B14
JESD-609代码:e0长度:2.403 mm
湿度敏感等级:1功能数量:1
端子数量:14最高工作温度:85 °C
最低工作温度:-30 °C封装主体材料:PLASTIC/EPOXY
封装代码:VFBGA封装形状:RECTANGULAR
封装形式:GRID ARRAY, VERY THIN PROFILE, FINE PITCH峰值回流温度(摄氏度):260
认证状态:Not Qualified座面最大高度:0.675 mm
表面贴装:YES切换器配置:DOUBLER INVERTER
最大切换频率:675 kHz技术:CMOS
温度等级:OTHER端子面层:Tin/Lead (Sn63Pb37)
端子形式:BALL端子节距:0.5 mm
端子位置:BOTTOM处于峰值回流温度下的最长时间:40
宽度:2.08 mmBase Number Matches:1

LM2794TL 数据手册

 浏览型号LM2794TL的Datasheet PDF文件第2页浏览型号LM2794TL的Datasheet PDF文件第3页浏览型号LM2794TL的Datasheet PDF文件第4页浏览型号LM2794TL的Datasheet PDF文件第5页浏览型号LM2794TL的Datasheet PDF文件第6页浏览型号LM2794TL的Datasheet PDF文件第7页 
March 2004  
LM2794/LM2795  
Current Regulated Switched Capacitor LED Supply with  
Analog and PWM Brightness Control  
General Description  
Features  
n Regulated current sources with 0.5% matching  
between any two outputs  
The LM2794/95 is a fractional CMOS charge-pump that  
provides four regulated current sources. It accepts an input  
voltage range from 2.7V to 5.5V and maintains a constant  
current determined by an external sense resistor.  
n High efficiency 3/2 boost function  
n Drives one, two, three or four white LEDs  
n 2.7V to 5.5V Input Voltage  
n Up to 80mA output current  
n Analog brightness control  
n Active-low or high shutdown input (’94/95)  
n Very small solution size and no inductor  
n 2.3µA (typ.) shutdown current  
n 325kHz switching frequency (min.)  
n Constant Frequency generates predictable noise  
spectrum  
n Standard Micro SMD-14 package: 2.08mm X 2.403mm  
X 0.845mm High  
n Thin Micro SMD-14 package: 2.08mm X 2.403mm X  
0.600mm High  
The LM2794/5 delivers up to 80mA of load current to accom-  
modate four White LEDs. The switching frequency is  
325kHz. (min.) to keep the conducted noise spectrum away  
from sensitive frequencies within portable RF devices.  
Brightness can be controlled by both linear and PWM tech-  
niques. A voltage between 0V and 3.0V may be applied to  
the BRGT pin to linearly vary the LED current. Alternatively,  
a PWM signal can be applied to the SD pin to vary the  
perceived brightness of the LED. The SD pin reduces the  
operating current to 2.3µA (typ.) The LM2794 is shut down  
when the SD pin is low, and the LM2795 is shut down when  
the SD pin is high.  
The LM2794/95 is available in a micro SMD-14 CSP pack-  
age.  
Applications  
n White LED Display Backlights  
n White LED Keypad Backlights  
n 1-Cell Li-Ion battery-operated equipment including  
PDAs, hand-held PCs, cellular phones  
Basic Application Circuit  
20028503  
© 2004 National Semiconductor Corporation  
DS200285  
www.national.com  

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