LM3556
- Grounded Cathode LED Operation for Improved Thermal Management
- 1.5-A High-Side Current Source for Single LED
- Accurate and Programmable LED Current from 46.9 mA to 1.5 A
- > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A)
- Small Solution Size: < 20 mm2
- LED Thermal Sensing and Current Scale-Back
- Soft-Start Operation for Battery Protection
- Hardware Enable Pin
- Hardware Torch Enable
- Hardware Strobe Enable
- Synchronization Input for RF Power Amplifier Pulse Events
- VIN Flash Monitor Optimization
- 400-kHz I2C-Compatible Interface
- I2C-Compatible Programmable NTC Trip Point
- 0.4-mm Pitch, 16-Pin DSBGA Package
The LM3556 is a 4-MHz fixed-frequency synchronous boost converter plus 1.5-A constant current driver for a high-current white LED. The high-side current source allows for grounded cathode LED operation providing flash current up to 1.5 A. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.
The LM3556 is controlled via an I2C-compatible interface.
Features include: a hardware flash enable (STROBE) allowing a logic input to trigger the flash
pulse, a hardware torch enable (TORCH) for Movie Mode or flashlight functions, a TX input which
forces the flash pulse into a low-current Torch Mode allowing for synchronization to RF power
amplifier events or other high-current conditions, and an integrated comparator designed to monitor
an NTC thermistor and provide an interrupt to the LED current. With a fast 1-μs transition from 0
mA to
46.9 mA, the TORCH input pin can be used to develop custom LED current waveforms.
The 4-MHz switching frequency, overvoltage protection and adjustable current limit allow for the use of tiny, low-profile inductors and 10-µF ceramic capacitors. The device is operates over a −40°C to +85°C temperature range.
For all available packages, see the orderable addendum at the end of the data sheet.技術資料
| 上位の文書 | タイプ | タイトル | フォーマットオプション | 最新の英語版をダウンロード | 日付 | |
|---|---|---|---|---|---|---|
| * | データシート | LM3556 1.5-A Synchronous Boost LED Flash Driver With High-Side Current Source データシート (Rev. D) | PDF | HTML | 2015/10/23 | ||
| ホワイト・ペーパー | Common LED Functions and LED Driver Design Considerations.. | 英語版 | 2020/09/21 | |||
| セレクション・ガイド | 電源 IC セレクション・ガイド 2018 (Rev. R 翻訳版) | 英語版 (Rev.R) | 2018/09/13 | |||
| アプリケーション・ノート | AN-2259 1.5A Synchronous Boost LED Flash Drvr w/ High-Side Cur Source Eval Board (Rev. A) | 2013/04/30 |
設計と開発
その他のアイテムや必要なリソースを参照するには、以下のタイトルをクリックして詳細ページをご覧ください。
LM355XSW-LINUX — Linux ドライバ、LM355X 用
The Linux driver supports the LM355X series of LED Drivers. The Linux driver supports communication through the I2C bus and interfaces with the LED sub-system.
Linux Mainline Status
Available in Linux Main line: Yes
Available through git.ti.com: N/A
Supported Devices:
- lm3554
- lm3556
Linux Source Files
(...)
SNVC065 — GUI software for LM3556TMEV
| パッケージ | ピン数 | CAD シンボル、フットプリント、および 3D モデル |
|---|---|---|
| DSBGA (YFQ) | 16 | Ultra Librarian |