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 mappings with 256 steps to setup the brightness of backlight LEDs. It also supports PWM dimming to adjust the brightness.

The RT4532 provides complete protection functions such as input under-voltage lockout, over-current, output over-voltage and over-temperature protection. The OVP threshold voltage can be set at 16V and 24V for different applications. The RT4532 is available in the WL-CSP-10B 0.87x2.07 package.

应用

Cellular Phones

Digital Cameras

PDAs and Smart Phones

Portable Instruments

关键特性

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