LM3509
FEATURES
- 2 Integrated OLED Display Power Supply and LED Driver
- Drives up to 10 LED’s at 30m A
- Drives up to 5 LED’s at 20m A and Delivers up to 21V at 40m A
- Over 90% Efficient
- 32 Exponential Dimming Steps
- 0.15% Accurate Current Matching Between
Strings
- 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
- 1.27MHz Fixed Frequency Operation
- Low Profile 10-Pin WSON Package (3mm x
3mm x 0.8mm)
- General Purpose I/O
- Active Low Hardware Reset
APPLICATIONS
- Dual Display LCD Backlighting for Portable Applications
- Large Format LCD Backlighting
- OLED Panel Power Supply
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...
