LM3519
- 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
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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.
技術文件
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM3519 High Freq Boost White LED Drvr w/High-Speed PWM Brightness Cntrl datasheet (Rev. B) | 2013年 5月 3日 | |
| White paper | Common LED Functions and LED Driver Design Considerations | 2020年 9月 21日 | ||
| EVM User's guide | AN-1406 LM3519 Evaluation Board (Rev. A) | 2013年 4月 30日 |
設計與開發
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PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
| 封裝 | 引腳 | 下載 |
|---|---|---|
| SOT-23-THN (DDC) | 6 | 檢視選項 |
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