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LM3570 - Low Noise White LED Driver System

Description

The LM3570 device provides a complete LED driver solution for wireless handsets and other portable devices using a display and keypad.

With three constant current sources, up to three white LEDs can be used for display lighting with excellent current matching (0.3% typ.).

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 80mA total output current n Active-High Enable n Active-High PWM Control Pin for independent control of current sources n Very small solution size n 1µA(max) shutdown current n 500kHz switching frequ.

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Datasheet preview – LM3570

Datasheet Details

Part number LM3570
Manufacturer National Semiconductor
File Size 352.79 KB
Description Low Noise White LED Driver System
Datasheet download datasheet LM3570 Datasheet
Additional preview pages of the LM3570 datasheet.

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Full PDF Text Transcription

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LM3570 Low Noise White LED Driver System July 2004 LM3570 Low Noise White LED Driver System General Description The LM3570 device provides a complete LED driver solution for wireless handsets and other portable devices using a display and keypad. With three constant current sources, up to three white LEDs can be used for display lighting with excellent current matching (0.3% typ.). The regulated 4.35V output voltage is perfect for driving auxiliary keypad LEDs in voltage mode. The LM3570 utilizes a high efficiency 3/2 CMOS chargepump with a pre-regulation loop that minimizes conducted noise on the input. It accepts an input voltage range from 2.7V to 5.5V and maintains a constant current determined by the current through an external RSET resistor.
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