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 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