RT4532 - Richtek Technology

RT4532 High Efficiency Backlight LED Driver

The RT4532 is a high-efficiency LED driver for backlight applications. An asynchronous boost converter with an internal Schottky diode and a current source driver are designed to support 6LED/channel with wide input voltage range from 2.5V to 5.5V. An I2C interface can provide easy backlight control in fast and high speed mode. The RT4532 supports linear map.

Features

 Input Voltage Range : 2.5V to 5.5V
 Internal Schottky Diode
 Fast-speed mode I2C Compatible Interface
 Drive Up to 6 WLEDs in 4 String
 External PWM Brightness Control
 550k/1.1MHz Switching Frequency
 Built-in Internal Soft-Start
 I2C Programmable 256 Steps Linear Current Regulation
 Up to 85% Efficiency with Small Magnetics
 Programmable 16V/24V OVP
 Current Accuracy ±5% and Current Balance ±3%
 UVLO, OVP, OCP, OTP Protection
 Shutdown Current : < 1μA
 Temperature Range : −40°C to 85°C Applications
 Cellular Phones
 Digital Cameras
 PDAs and Smart Phones
 Portable Instrume.