LM3554
- Input Voltage: 2.5 V to 5.5 V
- Programmable 4.5-V or 5-V Constant Output Voltage
- Dual High-Side Current Sources
- Grounded Cathode Allowing for Better Heat Sinking and LED Routing
- > 90% Efficiency
- Ultra-Small Solution Size: < 23 mm2
- Four Operating Modes: Torch, Flash, LED Indicator, and Voltage Output
- Accurate and Programmable LED Current from 37.5 mA to 1.2 A
- Hardware Flash and Torch Enable
- LED Thermal Sensing and Current Scaleback
- Software Selectable Input Voltage Monitor
- Programmable Flash Timeout
- Dual Synchronization Inputs for RF Power-Amplifier Pulse Events
- Open and Short LED Detection
- Active High Hardware Enable for Protection Against System Faults
- 400-kHz I2C-Compatible Interface
The LM3554 is a 2-MHz fixed-frequency, current-mode synchronous boost converter. The device is designed to operate as a dual 600-mA (1.2 A total) constant-current driver for high-current white LEDs, or as a regulated 4.5-V or 5-V voltage source.
The main features include: an I2C-compatible interface for controlling the LED current or the desired output voltage, a hardware flash enable input for direct triggering of the flash pulse, and dual TX inputs which force the flash pulse into a low-current torch mode allowing for synchronization to RF power amplifier events or other high-current conditions. Additionally, an active high hardware enable (HWEN) input provides a hardware shutdown during system software failures.
Five protection features are available within the LM3554 including a software selectable input voltage monitor, an internal comparator for interfacing with an external temperature sensor, four selectable current limits to ensure the battery current is kept below a predetermined peak level, an overvoltage protection feature to limit the output voltage during LED open circuits, and an output short circuit protection which limits the output current during shorts to GND.
For all available packages, see the orderable addendum at the end of the data sheet.技术文档
类型 | 标题 | 下载最新的英语版本 | 日期 | |||
---|---|---|---|---|---|---|
* | 数据表 | LM3554 Synchronous Boost Converter With 1.2-A Dual High-Side LED Drivers and I2C-Compatible Interface 数据表 (Rev. C) | PDF | HTML | 2016年 2月 26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 | |||
选择指南 | 电源管理指南 2018 (Rev. K) | 2018年 7月 31日 | ||||
选择指南 | 电源管理指南 2018 (Rev. R) | 2018年 6月 25日 | ||||
用户指南 | AN-1742 LM3554 Evaluation Board (Rev. B) | 2013年 7月 23日 |
设计和开发
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)。
LM3554TMEEV — 用于 LM3544 的评估板
Synchronous Boost Converter with 1.2A Dual High Side LED Drivers and I2C-Compatible Interface
LM355XSW-LINUX — 用于 LM355X 的 Linux 驱动程序
Linux Mainline Status
Available in Linux Main line: Yes
Available through git.ti.com: N/A
Supported Devices:
- lm3554
- lm3556
Linux Source Files
(...)
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封装 | 引脚 | 下载 |
---|---|---|
DSBGA (YFQ) | 16 | 查看选项 |
订购和质量
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- 器件标识
- 引脚镀层/焊球材料
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