FEATURES
• 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 to 21V at 40mA
• 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 for powering OLED panels.
Feature
- Calibrated Directly in Celsius (Centigrade)
- Linear + 10-mV/°C Scale Factor
- 0.5°C Ensured Accuracy (at 25°C)
- Rated for Full 55°C to 150°C Range
- Suitable for Remote Applications
- Low-Cost Due to Wafer-Level Trimming
- Operates From 4 V to 30 V
- Less Than 60-μA Current Drain
- Low Self-Heating, 0.08°C in Still Air
- Non-Linearity Only ±°C Typical
- Low-Impedance Output, 0.1 Ω for 1-mA Load
(Picture:Pinout / Diagram)
