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LM3509

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用于白光 LED 和/或 OLED 顯示屏的高效升壓，具有雙路電流阱

產品詳情

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 Duty cycle (max) (%) 90 LED current per channel (mA) 30 Peak efficiency (%) 88 Topology Boost Features I2C control Operating temperature range (°C) -40 to 85 Rating Catalog
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 Duty cycle (max) (%) 90 LED current per channel (mA) 30 Peak efficiency (%) 88 Topology Boost Features I2C control Operating temperature range (°C) -40 to 85 Rating Catalog
WSON (DSC) 10 9 mm2 3 x 3
  • 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

All trademarks are the property of their respective owners.

  • 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

All trademarks are the property of their respective owners.

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.

All trademarks are the property of their respective owners.

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 VOUT 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.

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.

All trademarks are the property of their respective owners.

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 VOUT 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.
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類型 標題 下載最新的英語版本 日期
* 數據表 HE Boost for White LED's / OLED Displays w/ Dual Sinks & I2C Brightness Control 數據表 (Rev. D) 2013年 5月 3日
白皮書 常見 LED 功能和 LED 驅動器設計注意事項 英語版 2020年 9月 21日
技術文章 How energy harvesting can extend the life of your fault indicator on the grid PDF | HTML 2017年 10月 18日
應用手冊 Analog PWM Dimming in White-LED Drivers 2016年 12月 21日
EVM 用戶指南 AN-1594 LM3509 Evaluation Board (Rev. A) 2013年 4月 30日

設計和開發

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LM3509SDEV — LM3509SD 評估板

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 (...)

用戶指南: PDF
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參考設計

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此參考設計展示了多個架構，這些架構可利用從電流互感器 (CT) 或太陽能電池收集能量的二次電池或超級電容器來延長原電池壽命。利用高效的 LED 驅動器來驅動串聯或并聯的LED，以控制光亮強度，實現 360° 的一致可見性，從而完成最佳電源管理。
設計指南: PDF
原理圖: PDF
封裝 引腳 CAD 符號、封裝和 3D 模型
WSON (DSC) 10 Ultra Librarian

訂購和質量

包含信息：
  • RoHS
  • REACH
  • 器件標識
  • 引腳鍍層/焊球材料
  • MSL 等級/回流焊峰值溫度
  • MTBF/時基故障估算
  • 材料成分
  • 鑒定摘要
  • 持續可靠性監測
包含信息：
  • 制造廠地點
  • 封裝廠地點

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