LM3570 Datasheet (National Semiconductor) - Low Noise White LED Driver System

LM3570, Low Noise White LED Driver System

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

LM3570 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