Texas Instruments LM3509
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.| Part No. | LM3509 |
|---|---|
| Datasheet | LM3509 Download |
| Manufacturer |  Texas Instruments |
| Description | High Efficiency Boost |
| Buy | Stock & Price |
FEATURES
1●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 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 PortableAPPLICATIONS
● Large Format LCD Backlighting● OLED Panel Power Supply
DESCRIPTION
Typical Application Circuits 10 PH 2.7V to 5.5V CIN 1 PF 10 k: 10 k: SW IN OVP LM3509 VIO SCL SDA MAIN SUB/FB RESET/GPIO SET GND 30 mA per string COUT 1 PF RSET 8 k: Dual White LED Bias Supply 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
