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.


  • Cellular Phones
  • Digital Cameras
  • PDAs and Smart Phones
  • Portable Instruments
Key Spec.
Status Last Time Buy
Vin (min) (V) 2.5
Vin (max) (V) 5.5
Vout (max) (V) 24
LED Channels 4
Topology Boost + Current Source
SW Freq (typ) (kHz) 1100
Dimming Control I2C;PWM
Features Adjustable Frequency;Backlight;Cycle-by-Cycle Current Limit;Enable Input;OVP;SCP;UVP
Package Type WL-CSP0.87x2.07-10(BSC)
  • 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
TitleLast UpdateDownload
High Efficiency Backlight LED Driver2014/08/29
Evaluation Boards
TitleLast UpdateDownload
RT4532 Evaluation Board2021/01/21
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT4532WSCWL-CSP0.87x2.07-10(BSC)3000 Request Buy from Distributor