LM2791LD-L

更新时间： 2024-11-12 22:10:03

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器开关
页数	文件大小	规格书
11页	225K
描述
Current Regulated Switched Capacitor LED Driver with Analog Brightness Control

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数据手册

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LM2791LD-L 数据手册

July 2002

LM2791

Current Regulated Switched Capacitor LED Driver with

Analog Brightness Control

General Description

Features

n Output matching of 0.3%

n Drives up to two LED’s

The LM2791 is a CMOS charge-pump voltage doubler and

regulator that provides two regulated current sources. The

LM2791 is designed to drive two white (or blue) LEDs with

matched currents (within 0.3%) to produce balanced light

sources for display backlights. They accept an input voltage

range from 3V to 5.8V and maintain a constant current

determined by an external set resistor.

n 3V to 5.8V Input Voltage

n Up to 36mA output current

n Soft start limits inrush current

n Analog brightness control

n Separate shutdown input

n Very small solution size - no inductor

n 0.7mA typical operating current

n 1µA (max.) shutdown current

n 450kHz switching frequency (min.)

n Linear regulation generates predictable noise spectrum

n LLP-10 package: 3mm X 3mm X 0.8mm

The LM2791 delivers up to 36mA of load current to accom-

modate two high forward voltage (typically white) LEDs. The

switching frequency is 450kHz (min.) to keep the conducted

noise spectrum away from sensitive frequencies within por-

table RF devices.

In the LM2791, brightness is controlled by applying a voltage

between GND and 3.0V to the BRGT pin. The LM2791 is

available in active high or low shutdown versions. The shut-

down pin reduces the operating current to 1µA (max.).

Applications

The LM2791 is available in a 10 pin leadless leadframe

(LLP) CSP package.

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

n Flat Panel Dispalys

Basic Application Circuit

20018301

DS200183

www.national.com

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与LM2791LD-L相关器件

型号	品牌	获取价格	描述	数据表
LM2791LD-L/NOPB	NSC	获取价格	IC LED DISPLAY DRIVER, DSO10, 3 X 3 MM, 0.80 MM HEIGHT, LLP-10, Display Driver
LM2791LDX-H	NSC	获取价格	Current Regulated Switched Capacitor LED Driver with Analog Brightness Control
LM2791LDX-H/NOPB	TI	获取价格	LED DISPLAY DRIVER, DSO10, 3 X 3 MM, 0.80 MM HEIGHT, LLP-10
LM2791LDX-L	NSC	获取价格	Current Regulated Switched Capacitor LED Driver with Analog Brightness Control
LM2792	NSC	获取价格	Current Regulated Switched Capacitor LED Driver with Analog Brightness Control
LM2792LD-H	NSC	获取价格	Current Regulated Switched Capacitor LED Driver with Analog Brightness Control
LM2792LD-H/NOPB	TI	获取价格	IC LED DISPLAY DRIVER, DSO10, 3 X 3 MM, 0.80 MM HEIGHT, LLP-10, Display Driver
LM2792LD-L	NSC	获取价格	Current Regulated Switched Capacitor LED Driver with Analog Brightness Control
LM2792LD-L	ROCHESTER	获取价格	LED DISPLAY DRIVER, DSO10, 3 X 3 MM, 0.80 MM HEIGHT, LLP-10
LM2792LD-L/NOPB	TI	获取价格	IC LED DISPLAY DRIVER, DSO10, 3 X 3 MM, 0.80 MM HEIGHT, LLP-10, Display Driver