LM3570 Low Noise White LED Driver System

National Semiconductor

Description

LM3570 Low Noise White LED Driver System July 2004 LM3570 Low Noise White LED Driver System General .
The LM3570 device provides a complete LED driver solution for wireless handsets and other portable devices using a display and keypad.

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Datasheet Specifications

Part number: LM3570
Manufacturer: National Semiconductor
File Size: 352.79 KB
Datasheet: LM3570_NationalSemiconductor.pdf
Description: Low Noise White LED Driver System

Features

* n 2.7V to 5.5V Input Voltage n Regulated Output Voltage (VOUT = 4.35V) n Regulated IDx with ± 0.3% matching between constant current outputs n High Efficiency 3/2 Boost function n Drives one, two, or three white LEDs with no bias resistor losses n Drives auxiliary keypad LEDS in voltage mode n Up to

Applications

* n Portable devices using white or blue LEDs with display and backlight or frontlight n 1-Cell LiIon battery-operated equipment including PDAs, hand-held PCs and cellular phones Typical Application Circuit 20085021 © 2004 National Semiconductor Corporation DS200850 www. national. com LM3570 Conn

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LM3570 Low Noise White LED Driver System National Semiconductor

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