LM2791LD-H National Semiconductor, LM2791LD-H Datasheet

LM2791LD-H

Manufacturer Part Number

LM2791LD-H

Description

Current Regulated Switched Capacitor LED Driver with Analog Brightness Control

Manufacturer

National Semiconductor

Datasheet

1.LM2791LD-H.pdf (11 pages)

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LM2791

Current Regulated Switched Capacitor LED Driver with

Analog Brightness Control

General Description

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

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.

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.).

The LM2791 is available in a 10 pin leadless leadframe

(LLP) CSP package.

Basic Application Circuit

0.3%) to produce balanced light

DS200183

Features

n Output matching of

n Drives up to two LED’s

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

Applications

n White LED Display Backlights

n White LED Keypad Backlights

n 1-Cell Li-Ion battery-operated equipment including

n Flat Panel Dispalys

PDAs, hand-held PCs, cellular phones

20018301

0.3%

www.national.com

July 2002

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