- 制造厂商：TI
- 产品类别：电源管理
- 技术类目：LED 驱动器 - 背光 LED 驱动器
- 功能描述：具有高速 PWM 亮度控制功能的高频升压白光 LED 驱动器
- 点击这里打开及下载LM3519的技术文档资料
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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.
- 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.
- 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
- LED current per channel (mA)
- 20
- Peak efficiency (%)
- 83
- Topology
- Boost
- Features
- OVP
- Operating temperature range (C)
- -40 to 85
LM3519的完整型号有：LM3519MK-20/NOPB，以下是这些产品的关键参数及官网采购报价：
LM3519MK-20/NOPB，工作温度：-40 to 85，封装：SOT-23-THIN (DDC)-6，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM3519MK-20/NOPB的批量USD价格：.679（1000+）
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