LM2793LD Datasheet

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LM2793 Low Noise White LED Constant Current Supply with Dual Function Brightness Control

February 2003

LM2793

Low Noise White LED Constant Current Supply with

Dual Function Brightness Control

General Description

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.

To control LED brightness, the amount of current driven to

the current-mode outputs can be adjusted with an analog

voltage and/or a pulse-width-modulated (PWM) square

wave.

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.

The LM2793 is available in a 10-pin Leadless Lead-frame

package: LLP-10.

Features

n

Two Regulated Current Outputs, up to 16mA Each,

Matched to Within

卤

0.3% (typ.)

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High Efficiency, 1.5x Regulated Charge Pump

n

Input Voltage Range: 2.7V to 5.5V

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Soft Start Limits Inrush Current

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Analog Voltage Brightness Control

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PWM Brightness Control

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Very Small Solution Size - NO INDUCTOR

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500kHz Switching Frequency

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3碌A (typ.) Shutdown Current

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LLP-10 Package: 3.0mm X 3.0mm X 0.8mm

Applications

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White LED Display Backlights

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White LED Keypad Backlights

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1-Cell LiIon Battery-Operated Equipment Including

PDAs, Hand-held PCs, Cellular Phones

n

Flat Panel Displays

Typical Application Circuit

20063602

漏 2003 National Semiconductor Corporation

DS200636

www.national.com

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