Datasheet > LM2793LD

LM2793LD

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

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LM2793LD 数据手册

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

DS200636

www.national.com

12 3 4 5 6 7...10

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