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LM3509

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用于白光 LED 和/或 OLED 显示屏的高效升压，具有双路电流阱

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LM3509

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产品详情

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 mm × 3 mm)
  • 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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顶层文档 类型 标题 格式选项 下载最新的英语版本 日期
* 数据表 HE Boost for White LED's / OLED Displays w/ Dual Sinks & I2C Brightness Control 数据表 (Rev. D) 2013-5-3
白皮书 常见 LED 功能和 LED 驱动器设计注意事项 英语版 2020-9-21
技术文章 How energy harvesting can extend the life of your fault indicator on the grid PDF | HTML 2017-10-18
应用手册 Analog PWM Dimming in White-LED Drivers 2016-12-21

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LM3509SDEV — LM3509SD 评估板

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 (...)

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参考设计

TIDA-00998 — 适用于高架故障指示灯的能量收集和故障指示灯子系统参考设计

此参考设计展示了多个架构，这些架构可利用从电流互感器 (CT) 或太阳能电池收集能量的二次电池或超级电容器来延长原电池寿命。利用高效的 LED 驱动器来驱动串联或并联的LED，以控制光亮强度，实现 360° 的一致可见性，从而完成最佳电源管理。
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WSON (DSC) 10 Ultra Librarian
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