LM3509 Description
The LM3509 current mode boost converter offers two separate outputs. The first output (MAIN) is a constant current sink for driving series white LED’s. The second output (SUB/FB) is configurable as a constant current sink for series white LED bias, or as a feedback pin to set a constant output voltage for powering OLED panels.
LM3509 Key Features
- 2 Integrated OLED Display Power Supply and LED Driver
- Drives up to 10 LED’s at 30mA
- Drives up to 5 LED’s at 20mA and Delivers up
- Over 90% Efficient
- 32 Exponential Dimming Steps
- 0.15% Accurate Current Matching Between
- Internal Soft-Start Limits Inrush Current
- True Shutdown Isolation for LED’s
- Wide 2.7V to 5.5V Input Voltage Range
- 21V Over-Voltage Protection
LM3509 Applications
- Dual Display LCD Backlighting for Portable Applications