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LM3519

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具有高速 PWM 亮度控制功能的高频升压白光 LED 驱动器

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LM3519

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产品详情

Number of channels 1 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 0 Vout (max) (V) 20 Type Inductive Switching frequency (max) (kHz) 5400 Duty cycle (max) (%) 95 LED current per channel (mA) 20 Peak efficiency (%) 83 Topology Boost Features OVP Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 1 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 0 Vout (max) (V) 20 Type Inductive Switching frequency (max) (kHz) 5400 Duty cycle (max) (%) 95 LED current per channel (mA) 20 Peak efficiency (%) 83 Topology Boost Features OVP Operating temperature range (°C) -40 to 85 Rating Catalog
SOT-23-THN (DDC) 6 8.12 mm² 2.9 x 2.8
  • Drives 2 to 4 LEDs at 20mA
  • Up to 30kHz PWM Dimming Control Capability
  • >80% Peak Efficiency
  • Up to 8MHz Switching Frequency
  • Small External Components: 1µH - 3.3µH(typ.2.2μH) Inductor and 1µF Output Capacitor
  • True Shutdown Isolation
  • Over-Voltage Protection
  • Wide Input Voltage Range: 2.7V to 5.5V
  • Small Footprint SOT-23 Package

All trademarks are the property of their respective owners.

  • Drives 2 to 4 LEDs at 20mA
  • Up to 30kHz PWM Dimming Control Capability
  • >80% Peak Efficiency
  • Up to 8MHz Switching Frequency
  • Small External Components: 1µH - 3.3µH(typ.2.2μH) Inductor and 1µF Output Capacitor
  • True Shutdown Isolation
  • Over-Voltage Protection
  • Wide Input Voltage Range: 2.7V to 5.5V
  • Small Footprint SOT-23 Package

All trademarks are the property of their respective owners.

The LM3519 drives up to 4 white LEDs with constant current to provide LCD backlighting in handheld devices. The LED current is internally set to 20mA. The series connection allows the LED current to be identical for uniform brightness and minimizes the number of traces to the LEDs. Brightness control is achieved by applying a PWM signal on enable with frequencies up to 30kHz.

The LM3519 features a proprietary PFM regulation architecture with switching frequencies between 2MHz to 8MHz, minimizing inductor size.

Over-voltage protection circuitry and high frequency operation permit the use of low-cost small output capacitors. During shutdown, the output is disconnected from the input in order to avoid leakage current path through the LEDs to ground.

The LM3519 is available in a tiny 6-pin SOT-23 package.

The LM3519 drives up to 4 white LEDs with constant current to provide LCD backlighting in handheld devices. The LED current is internally set to 20mA. The series connection allows the LED current to be identical for uniform brightness and minimizes the number of traces to the LEDs. Brightness control is achieved by applying a PWM signal on enable with frequencies up to 30kHz.

The LM3519 features a proprietary PFM regulation architecture with switching frequencies between 2MHz to 8MHz, minimizing inductor size.

Over-voltage protection circuitry and high frequency operation permit the use of low-cost small output capacitors. During shutdown, the output is disconnected from the input in order to avoid leakage current path through the LEDs to ground.

The LM3519 is available in a tiny 6-pin SOT-23 package.
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类型 标题 下载最新的英语版本 日期
* 数据表 LM3519 High Freq Boost White LED Drvr w/High-Speed PWM Brightness Cntrl 数据表 (Rev. B) 2013年 5月 3日
白皮书 常见 LED 功能和 LED 驱动器设计注意事项 英语版 2020年 9月 21日
EVM 用户指南 AN-1406 LM3519 Evaluation Board (Rev. A) 2013年 4月 30日

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