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LM2793 PDF预览

LM2793

更新时间: 2024-11-12 22:51:43
品牌 Logo 应用领域
美国国家半导体 - NSC /
页数 文件大小 规格书
10页 210K
描述
Low Noise White LED Constant Current Supply with Dual Function Brightness Control

LM2793 数据手册

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February 2003  
LM2793  
Low Noise White LED Constant Current Supply with  
Dual Function Brightness Control  
General Description  
Features  
n Two Regulated Current Outputs, up to 16mA Each,  
Matched to Within 0.3% (typ.)  
The LM2793 is a highly efficient, semi-regulated 1.5x CMOS  
charge pump that provides dual constant current outputs.  
The LM2793 has an input voltage range of 2.7V to 5.5V.  
n High Efficiency, 1.5x Regulated Charge Pump  
n Input Voltage Range: 2.7V to 5.5V  
n Soft Start Limits Inrush Current  
To control LED brightness, the amount of current driven to  
the current-mode outputs can be adjusted with an analog  
voltage and/or  
wave.  
a pulse-width-modulated (PWM) square  
n Analog Voltage Brightness Control  
n PWM Brightness Control  
Pre-regulation of the charge pump minimizes conducted  
noise on the input. Combined with a fixed switching fre-  
quency of 500kHz, the LM2793 is a low-noise solution.  
n Very Small Solution Size - NO INDUCTOR  
n 500kHz Switching Frequency  
n 3µA (typ.) Shutdown Current  
The LM2793 is available in a 10-pin Leadless Lead-frame  
package: LLP-10.  
n LLP-10 Package: 3.0mm X 3.0mm X 0.8mm  
Applications  
n White LED Display Backlights  
n White LED Keypad Backlights  
n 1-Cell LiIon Battery-Operated Equipment Including  
PDAs, Hand-held PCs, Cellular Phones  
n Flat Panel Displays  
Typical Application Circuit  
20063602  
© 2003 National Semiconductor Corporation  
DS200636  
www.national.com  

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