LM3550
- Up to 5 A Flash Current
- 4 Selectable Super-Capacitor Charge Voltage Levels (4.5 V, 5 V, 5.3 V, Optimized)
- Adjustable Torch Current (60 mA to 200 mA)
- Ambient Light or LED Thermal Sensing With Current Scaleback
- Dedicated Indicator LED Current Source
- No Inductor Required
- Programmable Flash Pulse Duration, and Torch and Flash Currents via I2C-Compatible Interface
- True Shutdown (LED Disconnect)
- Flash Timeout Protection
- Low Profile 20-Pin UQFN Package
(3 mm × 2.5 mm × 0.8 mm)
The LM3550 device is a low-noise, switched-capacitor DC-DC converter designed to operate as a current-limited and adjustable (up to 5.3 V) super-capacitor charger. The LM3550 features user-selectable termination voltages and provides one adjustable constant current output (up to 200 mA) and one NFET controller ideal for driving one or more high-current LEDs in a high-power flash mode or a low-power torch mode.
The LED current and flash pulse duration of the LM3550 can be programmed via an I2C-compatible interface. The STROBE pin allows the flash to be toggled via a flash-enable signal from a controller or camera module. The EOC pin sinks current when the output voltage reaches 95% of the final value.
The ALD/TEMP input pin allows either a light sensor to adjust the flash-current level based on the ambient light conditions, or it allows for over-temperature detection and protection of the LED during high-power operation or high ambient-temperature conditions.
For all available packages, see the orderable addendum at the end of the data sheet.技术文档
| 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 | LM3550 5-A Super-Capacitor Flash LED Driver 数据表 (Rev. C) | PDF | HTML | 2016-10-19 | ||
| 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 | |||
| 选择指南 | 电源管理指南 2018 | 2018-7-31 |
设计与开发
如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。
TIDA-00376 — 压电式扬声器频闪灯通知参考设计
TIDA-00376 使用我们的工业压电式驱动器、闪光灯 LED 驱动器和超低功耗 FRAM 微控制器 (MCU) 来演示听觉和视觉通知子系统的实现方式，这些子系统主要应用于火灾警报终端设备系统。该参考设计展示了通过单个压电传感器和一个低输入电流和高光输出 LED 频闪灯生成的多警报音频率输出。
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| UQFN (NHU) | 20 | Ultra Librarian |
订购和质量
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