LM3648
- 1.5-A LED Current Source Programmability
- Accurate and Programmable LED Current Range from 1.954 mA to 1.5 A
- Torch Currents up to 500 mA (LM3648TT)
- Flash Timeout Values up to 1.6 Seconds (LM3648TT)
- Optimized Flash LED Current During Low Battery Conditions (IVFM)
- > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A)
- Grounded Cathode LED Operation for Improved Thermal Management
- Small Solution Size: < 16 mm2
- Hardware Strobe Enable (STROBE)
- Synchronization Input for RF Power Amplifier Pulse Events (TX)
- Hardware Torch Enable (TORCH/TEMP)
- Remote NTC Monitoring (TORCH/TEMP)
- 400-kHz I2C-Compatible Interface
- LM3648 (I2C Address = 0x63)
The LM3648 is an LED flash driver that provides a high level of adjustability within a small solution size. The LM3648 utilizes a 2-MHz or 4-MHz fixed-frequency synchronous boost converter to provide power to the 1.5-A constant current LED source. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.
Features of the LM3648 are controlled via an I2C-compatible interface. These features include: hardware flash and hardware torch pins (STROBE and TORCH/TEMP), a TX interrupt, and an NTC thermistor monitor. The device offers 64 programmable currents in Flash and 128 levels in Movie Mode (Torch) condition.
The 2-MHz or 4-MHz switching frequency options, overvoltage protection (OVP), and adjustable current limit allow for the use of tiny, low-profile inductors and (10-µF) ceramic capacitors. The device operates over a –40°C to +85°C ambient temperature range.
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 | LM3648 Synchronous Boost LED Flash Driver with 1.5-A High-Side Current Source 数据表 (Rev. D) | PDF | HTML | 2016-11-18 | ||
| 应用手册 | 采用 LM364x 的无升压电感器设计，用于相机模块的长时间调焦 | PDF | HTML | 英语版 | PDF | HTML | 2022-6-11 | |
| 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 | |||
| 应用手册 | LED Flash-Protection Features | 2017-8-23 | ||||
| 应用手册 | Using Flash LED Drivers for Infrared (IR) LED Applications | 2017-3-20 | ||||
| 应用手册 | Using the LM3643/4/8 in an Inductorless and/or Simplified PCB Routing Configurat | 2016-10-11 | ||||
| 技术文章 | Shrink your LED flash solution | PDF | HTML | 2015-12-10 |
设计与开发
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| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| DSBGA (YFF) | 12 | Ultra Librarian |