LM3509 Datasheet (Texas Instruments)

LM3509, High Efficiency Boost

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 volta

LM3509 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