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RT4501/A
High Efficiency Backlight LED Driver
General Description
The RT4501/A is a high-efficiency LED driver for b...
®
RT4501/A
High Efficiency Backlight LED Driver
General Description
The RT4501/A 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 RT4501 supports linear mappings with 256 steps to setup the brightness of backlight LEDs. It also supports PWM dimming to adjust the brightness.
For brightness dimming, the RT4501A supports 128 steps pulse dimming which determines the LED current, and RT4501 support 256 steps PWM dimming which determines the LED current.
The RT4501/A provides complete protection functions such as input under-voltage lockout, over-current, output overvoltage and over-temperature protection. The OVP threshold voltage can be set at 16V and 25.5V for different applications. The RT4501/A is available in the WL-CSP-10B 0.87x2.07 (BSC) package.
Features
Input Voltage Range : 2.5V to 5.5V Internal
Schottky Diode Fast-speed mode I2C Compatible Interface Drive Up to 7 WLEDs in 2 String External PWM/Pulse Brightness Control 550k/1.1MHz Switching Frequency Built-in Internal Soft-Start PWM Dimming/Pulse Dimming Resolution 256/128
Steps I2C Programmable 256 Steps Linear Current
Regulation Up to 85% Efficiency with Small Magnetics Programmable 16V/25.5V OVP Current Accuracy ±5% and Cu...