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.技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | LM3648 Synchronous Boost LED Flash Driver with 1.5-A High-Side Current Source datasheet (Rev. D) | PDF | HTML | 2016/11/18 | ||
| 應用說明 | No Boost Inductor Design with LM364x for Long-Time Focusing in Camera Module | PDF | HTML | 2022/2/16 | |||
| 白皮書 | Common LED Functions and LED Driver Design Considerations | 2020/9/21 | ||||
| 應用說明 | LED Flash-Protection Features | 2017/8/23 | ||||
| 應用說明 | Using Flash LED Drivers for Infrared (IR) LED Applications | 2017/3/20 | ||||
| 應用說明 | Using the LM3643/4/8 in an Inductorless and/or Simplified PCB Routing Configurat | 2016/10/11 | ||||
| 技術文章 | Shrink your LED flash solution | PDF | HTML | 2015/12/10 |
設計與開發
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| DSBGA (YFF) | 12 | Ultra Librarian |