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.

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When configured as a dual output white LED bias supply, the LM3509 adaptively regulates the supply voltage of the LED strings to maximize efficiency and insure the current sinks remain in regulation. The maximum current per output is set via a single external low power resistor. An I²C compatible interface allows for independent adjustment of the LED current in either output from 0 to max current in 32 exponential steps. When configured as a white LED + OLED bias supply the LM3509 can independently and simultaneously drive a string of up to 5 white LED’s and deliver a constant output voltage of up to 21V for OLED panels.

Output over-voltage protection shuts down the device if V_OUT rises above 21V allowing for the use of small sized low voltage output capacitors. The LM3509 is offered in a small 10-pin thermally- enhanced WSON package and operates over the -40°C to +85°C temperature range.

• 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

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• Number of channels (#)
• 2
• Vin (Min) (V)
• 2.7
• Vin (Max) (V)
• 5.5
• Vout (Min) (V)
• 0
• Vout (Max) (V)
• 21
• Type
• Inductive
• Switching frequency (Max) (kHz)
• 1250
• LED current per channel (mA)
• 30
• Peak efficiency (%)
• 88
• Topology
• Boost
• Features
• I2C Control
• Operating temperature range (C)
• -40 to 85

LM3509的完整型号有：LM3509SD/NOPB、LM3509SDE/NOPB、LM3509SDX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3509SD/NOPB，工作温度：-40 to 85，封装：WSON (DSC)-10，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM3509SD/NOPB的批量USD价格：1.003（1000+）

LM3509SDE/NOPB，工作温度：-40 to 85，封装：WSON (DSC)-10，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM3509SDE/NOPB的批量USD价格：1.003（1000+）

LM3509SDX/NOPB，工作温度：-40 to 85，封装：WSON (DSC)-10，包装数量MPQ：4500个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM3509SDX/NOPB的批量USD价格：.836（1000+）

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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 outut (SUB/FB) is configurable as a constant current sink for series white LED bias, or as a feedback pin to set a constant output (...)

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