RT4539
Overview
The RT4539 is a high efficiency driver for white LEDs. It is suitable for single/two cell battery input to drive LED light bars which contains six strings in parallel.
- Wide Operating Input Voltage : 2.7V to 24V
- High Output Voltage : Up to 36V
- Programmable Channel Current : 10.04mA to 35mA
- Channel Current Regulation with Accuracy ±3% and Matching ±2%
- Dimming Controls Direct PWM Dimming up to 20kHz and Minimum On-Time to 400ns PWM to Analog Dimming up to 20kHz with 9-bit Resolution PWM Pin and/or I2C-Controlled with Programmable Linear@12 bits or Exponential@11 bits Brightness Control Digitally Advanced Sloping for Smooth Dimming
- Adjustable Dimming Mode Control.
- Adjustable Advanced Brightness Control.
- Adjustable Switching Frequency of Boost Converter from 300kHz to 1.6MHz.
- PFM function for High Efficiency at Light Load
- Programmable Spread Spectrum Scheme and Edge Rate Control Minimize Switching Noise and Improve EMI Performa
