Datasheet4U Logo Datasheet4U.com

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.).

Key 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.

📥 Download Datasheet

Other Datasheets by National Semiconductor (now Texas Instruments)

Part Number Description
LM3578A Switching Regulator
LM35 Precision Centigrade Temperature Sensors
LM350 3-Amp Adjustable Regulators
LM3501 Synchronous Step-up DC/DC Converter
LM3502 Step-Up Converter
LM3503 Dual-Display Constant Current LED Driver
LM350A 3-Amp Adjustable Regulators
LM351 Dual Peripheral Drivers
LM3519 High Frequency Boost White LED Driver
LM3520 Integrated White LED Driver

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
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.