LM2791 Current Regulated Switched Capacitor LED Driver

National Semiconductor

Description

LM2791 Current Regulated Switched Capacitor LED Driver with Analog Brightness Control July 2002 LM2791 Current Regulated Switched Capacitor LED Driv.
The LM2791 is a CMOS charge-pump voltage doubler and regulator that provides two regulated current sources.

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Datasheet Specifications

Part number: LM2791
Manufacturer: National Semiconductor
File Size: 226.70 KB
Datasheet: LM2791_NationalSemiconductor.pdf
Description: Current Regulated Switched Capacitor LED Driver

Features

* n n n n n n n n n n n n n Output matching of ± 0.3% Drives up to two LED’s 3V to 5.8V Input Voltage Up to 36mA output current Soft start limits inrush current Analog brightness control Separate shutdown input Very small solution size - no inductor 0.7mA typical operating current 1µA (max. ) shutdown

Applications

* 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 © 2002 National Semiconductor Corporation DS200183 www. national. com LM2791 Connection

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LM2791 Current Regulated Switched Capacitor LED Driver National Semiconductor

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